Y Synhwyrau Anghyfarwydd Corff Cymru


Y Synhwyrau Anghyfarwydd

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-Every single second of every day...

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-..our senses gather information

-about our environment.

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-The senses connect us

-to our surroundings.

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-I'm Dr Anwen Rees,

-a Physiology lecturer...

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-..at Cardiff Metropolitan

-University.

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-I'm Dr Katie Hemer, a Bioarchaeology

-specialist at Sheffield University.

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-We will look at the way the brain

-uses information...

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-..to create

-a unique picture of the world.

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-We will look at familiar

-and unfamiliar senses...

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-..and how they collaborate.

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-And how to trick them.

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-THE OTHERS

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-During the series, we've looked at

-all our familiar senses.

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-We have some unfamiliar ones too.

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-Without these, simple things

-like sitting up, standing up...

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-..and riding a bike

-would be hard work.

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-It's already hard! Come on, Anwen!

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-It's already hard! Come on, Anwen!

-

-I'm pedalling!

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-What is proprioception?

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-Proprioception is the brain's

-ability to sense stimuli...

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-..regarding the position

-of arms and legs...

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-..without using

-any of the other senses.

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-Close your eyes

-and touch your nose.

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-You're using proprioception.

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-Receptors in muscles and tendons

-tell the brain were the arm is...

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-..to lead it to the nose.

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-Those who lose their proprioceptive

-sense will struggle...

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-..as they must think about their

-body parts' position before moving.

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-Our sense of proprioception

-is vital but difficult to quantify.

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-At the SoBA Lab,

-Bangor University...

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-..Dr Emily Cross's research team

-can offer clues on how it works.

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-Students and myself

-were interested in knowing...

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-..how you learn new movement...

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-..and how your brain changes

-as you pick up a kinaesthetic...

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-..or a motor sense of what a new

-action might feel like on your body.

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-What that means is I have to dance!

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-I must perform

-the same movements...

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-..as the dancer

-in the computer game on the screen.

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-My score depends on how closely

-I can match the dancer's movements.

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-I'm not a great dancer, but I'm

-doing this in the name of science!

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-Proprioception

-allows my brain to keep a record...

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-..of the position of my legs

-and arms are while I dance.

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-I just danced for the first time and

-it was hard to follow the dancer.

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-I had no idea what would happen next

-and the movements were tricky.

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-It felt unnatural.

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-Dancers have greater awareness

-of the position of their body.

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-Emily invited Rhys Jenkins, who's

-a tap dancer, to do the same test.

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-This computer game uses a special

-camera to measure body movement...

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-..giving the researchers

-an unbiased score.

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-We study dance, not because

-we care about dance per se.

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-What we're really interested in is

-how people learn complex movement.

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-The team looks at the effect

-a complex task like a dance...

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-..has on the brain.

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-Next, Rhys and I dance again...

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-..to see if the fact we've done

-this before affects our score.

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-Emily's team usually monitors

-changes over a far longer period.

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-The practise run helped.

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-I knew what I had to do next

-and I knew how to move.

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-It was easier

-and it felt more natural.

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-That's because I didn't have to

-focus so much on the screen...

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-..and on every single movement.

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-My score doubled

-but Rhys outperformed me.

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-Rhys, you trebled your score.

-How was it for you?

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-It was hard at first, but once I'd

-done it a few times, it was easier.

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-Did your dance background help?

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-Yes, I think so.

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-I could keep the rhythm

-when I was dancing.

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-That's a skill which I learned

-when I took up dancing.

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-I think it helped.

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-The fact that both Rhys and I

-improved our scores...

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-..demonstrates that our brains

-adapted in a short space of time.

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-The research carried out

-by Emily's team...

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-..shows that areas of the brain

-associated with proprioception...

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-..become more active with practise.

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-Rhys outperformed me as he's used to

-moving his body through dance.

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-Proprioception is malleable.

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-When you have different experiences,

-it will change.

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-This is a motor learning

-and a visual learning task...

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-..so your sense of proprioception

-is changing.

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-It's a multi-sensory task.

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-Sight, hearing and balance play a

-part, in addition to proprioception.

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-They all work together.

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-Emily's team is interested in

-what part individual senses play...

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-..in complex movement tasks.

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-This will help us understand how

-senses like proprioception work...

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-..and understand how the brain

-combines the senses...

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-..to allow us to perform

-movement tasks in everyday life.

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-How does balance work?

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-There's a vestibular system

-in the inner ear...

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-..which includes three semicircular,

-hair-lined tubes...

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-..and a fluid called endolymph

-and tiny stones called otoliths.

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-When you move your head,

-you move the endolymph...

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-..thus moving the hairs

-and the otoliths.

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-This tells the brain you're moving

-sideways, up and down or spinning.

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-The brain responds to messages

-from the ear, the eyes...

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-..and proprioception receptors

-all over the body.

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-It constantly adjusts our balance.

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-Feeling dizzy isn't pleasant.

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-It happens because our body has

-a clever way of keeping us upright.

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-Why do we get dizzy?

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-First, we must look at the part

-the ear plays in balance.

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-The body senses if we're lying down,

-standing up...

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-..moving or standing still...

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-..by using the vestibular system

-in the inner ear.

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-It's full of a thick fluid

-called endolymph.

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-Imagine this bottle is my head...

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-..and the water

-is the endolymph in my inner ear.

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-If I spin it, the water moves in the

-same direction as the bottle...

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-..but if I stop,

-the liquid keeps moving.

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-Once I start to spin, the movement

-of the liquid tells my brain...

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-..that my head is moving.

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-The brain gets used to that signal.

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-When I stop spinning, the liquid

-still sends signals to the brain...

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-..and it decides

-that I'm still moving.

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-That's why I feel dizzy.

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-This system is important because it

-tells me how far, how quickly...

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-..and in what direction

-the head is moving.

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-The brain uses this information

-to keep us upright.

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-How good is my sense of balance?

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-Rhian Halford from NoFit State

-circus has a challenge for me.

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-Rhian, what must I do today?

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-You're going to walk on a wire.

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-Choose a line across the floor

-and stand on it on one leg.

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-Don't look down.

-Look at the end of the line.

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-Imagine the wire ends there.

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-Hold your hands up.

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-The leg which is in the air

-will feel for the toes.

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-Slide that foot along

-and lift your other leg.

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-Toes down, then slide across.

-Lift the back leg.

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-Why must I look straight ahead

-rather than down?

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-When you go on the wire,

-you'll have two platforms.

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-You start on one

-and end on the other.

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-That's where your focus must be.

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-Also, the head is quite heavy...

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-..so if your head tips down,

-your body weight will follow.

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-Are you ready for the wire?

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-Are you ready for the wire?

-

-I think so.

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-I'll help you at first.

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-Focus on the end.

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-The eyes are important for balance.

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-Keeping the head up and looking

-at the end of the wire...

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-..tells the brain

-the body is straight.

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-Remember to breathe.

-Breathing is good for you!

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-Breathing is important.

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-If the head turns or I look down,

-the body wants to follow...

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-..and I'm likely to fall.

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-I'm concentrating hard but I'm glad

-Rhian's holding my hand.

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-That wasn't too bad

-but Rhian was holding me.

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-It's time to go it alone.

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-No! I've gone.

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-Focus.

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-It's far more difficult

-without Rhian's help.

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-I'm thinking about everything

-at the same time.

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-This is one of the hardest things

-I've ever done...

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-..but I'm getting better.

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-Oh, no!

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-I made it, at last...

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-..with a helping hand!

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-Rhian had another challenge for me.

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-I must try to do this!

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-Easy!

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-.

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-Subtitles

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-Subtitles

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-How many senses do we have?

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-Five, according to Aristotle.

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-It's a hot topic among scientists...

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-..but we may have

-between nine and 21 senses.

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-For something to be a sense

-requires a receptor...

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-..like pain nociceptors

-or taste buds...

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-..which supply the brain

-with information about our world.

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-There may be heat receptors

-and itch receptors on the skin.

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-Receptors in the bladder tell

-the brain when we need the loo...

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-..receptors in the bowel

-tell the brain when it's full...

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-..and receptors tell the brain how

-much oxygen there is in the blood.

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-What about

-hunger and thirst receptors?

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-Research and new techniques

-may find a definitive answer.

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-The important thing...

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-..is that brain reads and combines

-information from the senses...

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-..to give us a detailed,

-complete picture of the world.

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-Do animals

-have the same senses as humans...

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-..or do they have additional senses?

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-Zoologist, Dr Gethin Thomas,

-will tell me more.

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-We're feeding pigeons.

-What's so important about them?

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-Pigeons can see magnetic fields,

-thanks to a protein in their eyes...

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-..which reacts with light.

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-They can see differences in

-the magnetic force of the earth...

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-..in the same way

-as we see contour lines on a map.

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-Why can they sense magnetic fields?

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-Being able to work out where you are

-is advantageous to an animal.

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-The earth's magnetic field

-isn't uniform.

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-There are strong areas

-and weak areas.

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-Animals can use this

-to navigate themselves.

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-During migration...

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-..they use magnetic fields

-to guide them.

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-What other additional senses

-do animals have?

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-Sharks are sensitive

-to electric fields.

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-Muscles or a beating heart

-create electric fields.

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-Pores in the shark's nose,

-known as ampullae of Lorenzini...

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-..can sense electric fields to

-bring the shark closer to its prey.

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-Why have animals developed

-different senses from ours?

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-Each sense must allow the animal to

-find something in its environment...

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-..be that its prey, a mate or

-a predator which must be avoided.

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-Animals must adapt physically

-to sense their surroundings.

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-It all depends on the pattern

-of the animal's life.

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-Like around four percent

-of the population...

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-..Rachel Howells has synaesthesia.

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-I like these.

-They're the correct colour.

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-It was hard to find this S

-because S should be yellow.

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-It's difficult for me

-to find a green S.

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-I'm struggling because

-so many of these are wrong.

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-Synaesthesia is often described

-as a joining of the senses.

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-We all sense the world

-in a different way...

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-..and every synaesthete's experience

-is unique to them.

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-Some hear colours

-and others taste words.

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-Synaesthesia

-is different for everyone.

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-For me, letters, numbers,

-days of the week, months...

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-..and pain...

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-..have some sort of colour

-in my head.

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-When I think of a letter,

-I don't see just one colour.

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-H isn't just a strong blue.

-There's more texture to it.

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-It's as though you painted it blue,

-then put the brush in water...

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-..and you see the blue

-mix into the water.

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-Grass isn't just green.

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-The brown of the soil comes through,

-there are flowers in it...

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-..the grass itself is yellowing

-and there are shadows on it.

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-All colours are complex to me.

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-Many people go through life not

-realizing they're synaesthetes.

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-They assume everyone

-senses the world like them.

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-I knew I was a synaesthete

-when I was seven years old.

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-I remember talking to my mother...

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-..and telling her

-that number five is green.

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-She didn't know what I meant

-and I knew then this was unusual.

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-Years later, I watched a

-TV programme about synaesthesia...

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-..and I finally put a name

-to what I had.

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-It helps me remember dates

-and phone numbers.

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-It also helps me plan ahead,

-into the future...

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-..because I can see

-days of the week and months.

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-They're a specific colour and they

-stretch in a timeline into space.

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-If I think about next Wednesday...

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-..it's a specific colour.

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-I know that's the pink day

-next week.

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-It's thought synaesthesia

-is genetic...

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-..so it may be passed down

-from parents to their children.

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-My daughter's five years old...

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-..and she's started to talk about

-numbers and colours.

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-I think I've passed it down to her.

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-It's great. I'm so excited.

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-She can experience the world

-through colour and it's fantastic.

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-It's likely we all have a degree

-of synaesthesia as infants.

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-As the brain develops

-and organizes itself...

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-..connections are broken.

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-In synaesthetes, it's thought

-some connections remain...

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-..meaning messages from

-different senses become jumbled.

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-I enjoy having this

-different dimension in my life.

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-I experience the world

-through the medium of colour.

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-I kept my balance...

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-..and walked across a wire

-one foot off the ground.

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-Rhian Halford has a challenge which

-will test my balance to the maximum.

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-I should be able to do this today?

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-I should be able to do this today?

-

-Yes, before the end of the day.

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-The low wire was difficult at first.

-It was difficult, full stop!

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-I found it hard to keep my balance.

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-Once my shoulders

-had tipped to one side, I fell off.

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-The wire

-is six feet above the ground...

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-..so my head is over 11 feet

-off the ground.

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-This has had a massive

-psychological effect on me.

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-I can't let go!

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-I can't let go!

-

-You're fine.

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-Right. Come on, Anwen!

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-Right.

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-Move your arms.

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-Concentrate. You're fine.

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-Remember to breathe.

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-I'm glad Adie's here

-to hold the rope.

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-Shoulders up.

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-Concentrate.

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-Shoulders.

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-Focus.

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-You're nearly there.

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-Once I'd fallen off,

-I felt happier...

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-..and I got used to

-ignoring the distance to the ground.

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-Oh, no!

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-I had to keep my centre of balance

-precisely above the wire...

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-..which is only half an inch thick!

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-If my centre of balance moves a

-little, I'm very likely to fall off.

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-Stretching put my arms and legs

-lowers my centre of balance...

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-..making it easier.

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-But it's still incredibly difficult.

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-Rhian, I reached the platforms...

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-..at the other end of the high wire

-and the low wire.

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-How was my balance?

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-Your balance is good

-and you can correct mistakes.

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-The biggest mistake you made

-was dropping your shoulders.

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-You realized that and you improved.

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-That really helped your balance.

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-It may have been a case

-of my brain...

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-..getting used to the position

-of every part of my body...

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-..so I understood more

-about balance...

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-..or the fact that I stopped

-thinking about being on a wire.

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-Do you want to go higher?

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-I don't think so!

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-That was enough for me.

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-In order to stay on the wire...

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-..my brain took heed of messages

-from my eyes and my inner ear...

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-..about the position and movement

-of my head.

0:21:450:21:49

-It also took heed of proprioception

-receptors in my arms and legs...

0:21:490:21:54

-..about the position of my body.

0:21:540:21:57

-It corrected every deviation

-away from normal to keep me upright.

0:21:570:22:01

-Practice makes perfect.

0:22:010:22:03

-The brain can prepare the body

-and control it.

0:22:030:22:07

-We take our sense of balance

-for granted but it's truly amazing.

0:22:070:22:12

-During the series, we've looked at

-all the familiar senses...

0:22:150:22:19

-..and some unfamiliar ones like

-balance, proprioception and pain.

0:22:200:22:25

-It's your turn, Katie!

0:22:260:22:28

-It's amazing how much information

-our senses give us about our world.

0:22:300:22:34

-The brain

-juggles that information...

0:22:350:22:37

-..to decide what's important

-and what can be ignored.

0:22:380:22:42

-Oh! The other side!

0:22:420:22:44

-The senses can work together

-or against each other...

0:22:450:22:49

-It looks the same

-and it tastes the same.

0:22:500:22:52

-..to influence the way

-we experience our surroundings.

0:22:530:22:57

-Katie, what did you enjoy the most?

0:23:020:23:04

-Katie, what did you enjoy the most?

-

-I didn't enjoy the dancing!

0:23:040:23:07

-I enjoyed meeting

-the blind football team.

0:23:090:23:13

-I spent a day

-learning about echolocation.

0:23:150:23:18

-It was an incredible experience.

0:23:180:23:20

-The left.

0:23:210:23:22

-The left.

-

-Well done.

0:23:220:23:23

-I think we both had a favourite bit.

0:23:240:23:26

-Seeing our producer do a pain test!

0:23:270:23:30

-Yes, I enjoyed that,

-after everything he made us do!

0:23:300:23:35

-Ugh!

0:23:360:23:38

-S4C subtitles by Eirlys A Jones

0:23:550:23:57

-.

0:23:570:23:58

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