Hearing, Taste And Movement Flashcards

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1
Q

How are sound waves detected?

A

Pinna (outer ear)

Tympanic membrane (eardrum)

Cochlea (with 3 fluid filled tunnels)

Vibrations displace hair cells in cochlea

Auditory nerve (nerve bundle)

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2
Q

Where is the sound info processed in the brain?

A

Ear

Cochlear nucleus
crossover
Primary auditory cortex

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3
Q

What’s the place theory?

Distinguishing between frequencies

A

Each area of the basilar membrane refers to a specific pitch

BUT areas too tightly linked to resonate

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4
Q

What’s the frequency theory?

Distinguishing between frequencies

A

Vibrations of basilar membranes in sync with sound waves

BUT Neurons can’t fire quick enough

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5
Q

What’s the current view of distinguishing between frequencies?

A

Combination of both place theory and frequency theory

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6
Q

If the primary auditory cortex is damaged could it cause deafness?

A

Sound processing would be affected but not deafness

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7
Q

If the middle ear is damaged could it cause deafness?

A

Conductive deafness - damage of bones of the Middle ear

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8
Q

What happens with nerve deafness?

A

Damage of cochlea, hair cells

Inherited

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9
Q

How do the ears receive different information? (3)

A

Difference in time of arrival
Difference in intensity
Phase difference in sound waves

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10
Q

What’s the hearing range?

A

20hz to 20khz

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11
Q

What’s vestibular sensation?

A

Sensations of body rotation , gravitation and movement

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12
Q

What does the vestibular organ do and what’s it crucial for?

A

Detects position and movement of the head

Crucial for balance

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13
Q

What are the 3 semicircular canals of the vestibular organ?

A

Next to the inner ear

Filled with jelly like substance, lined with hair cells

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14
Q

How does vestibular sensation work?

A

Head moves

Within the 3 semicircular cans (jelly like substance moves)

Calcium carbonate particles move against hair cells

Brain stem

Cerebellum

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15
Q

Why are there 3 canals?

A

To represent the three dimensions

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16
Q

What 3 things make up sound? And what are they?

A

Sound waves - periodic compressions of air, causing vibrations

Frequency - number of compressions per time, relates to perceived pitch

Amplitude - intensity of the sound waves, relates to the perceived loudness

17
Q

What affects people’s sensitivity?

A

The number of fungiform papillae affect people’s sensitivity to all tastes

Lots of them increase sensitivity “super tasters”

18
Q

What are a group of taste buds called?

A

Papillae

19
Q

What are taste buds similar to?

A

Behave like Neurons : release neurotransmitters to excite nearly Neurons

But not Neurons: modified skin cells

20
Q

What are the 4 types of primary taste?

A

Sweet
Salty
Sour
Bitter

21
Q

What recent discovery of taste has even found?

A

Glutamate taste receptors found in fast foods

22
Q

How does the brain encode taste?

A

Taste

Medulla

Insula and somatosensory cortex

23
Q

What 2 functions does the tongue have?

A

Taste

Touch

24
Q

What happens when humans taste?

A

To obtain information on the chemical environment with physical contact and with a focus on food

25
Q

What 3 chemical sensory organs do humans have?

A

Taste
Smell
Vomeronasal organs

26
Q

What is vomeronasal sensation?

A

Detects odourless chemicals that affects behaviour

Receptors of olfactory bulb

27
Q

Name and describe 2 movement disorders?

A

Huntingtons disease - arm jerks, facial twitches, body tremors

Parkinson’s disease - rigidity, muscle tremors, slow movements

Both are neurodegenerative diseases (involves deaths of Neurons in the brain)

28
Q

How do we move?

A

Skeletal or striated muscles controls movement of body in relation to the environment

29
Q

What are the 3 muscle types?

A

Skeletal or striated muscles

Smooth muscles

Cardiac muscles

30
Q

What’s the primary motor cortex?

A

It has a map of areas of body’s movements

Stimulation at each spot causes specific movement

Active even when we think about movement

31
Q

MOODLE

which of these brain areas are involved in behavioural actions or in initiating such movements?

A

Cerebral cortex
Primary motor cortex
Basal ganglia

32
Q

MOODLE

Parkinson’s disease is associated with release mechanisms of which neurotransmitter?

A

Dopamine

33
Q

MOODLE

The cerebellum is most important for processes that require…

A

Precise timing