Hearing/Speaking/Music

15 important questions on Hearing/Speaking/Music

What 2 basic features do sound waves have?

1. Frequency (pitch) - the rate at which air molecules vibrate (slow vibrations = low frequency = sound waves are perceived as having a low pitch)

2. Amplitude (loudness) - the number of air molecules that are vibrating in a sound wave (an increased number of vibrating air molecules increases the amount of energy in a sound wave = sound is perceived as louder). The amplitude is denoted by the frequency of action potentials.

What is the function of the pinna (the outer ear)?

It collects and amplifies sound waves

What is the function of the ear drum (the middle ear)?

Transmits the sound energy mechanically to the fluid filled inner ear (the cochlea). The ear drum does this by vibrating - this vibration then passes the sound waves onto the ossicles. The stirrup bangs against the oval window which passes this vibration to the cochlea.
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What is the function of the inner ear (cochlea)?

The cochlea converts these mechanical vibrations into electrical signals. It is where the mechanical sound waves get transduced into action potentials

How does the ear determine what frequency the sound is?

The cochlea contains auditory receptor neurons which are found next to the basilar membrane. These receptor neurons convert sound into electrical signals.
Different parts of the basilar membrane vibrate at different frequencies of sound - beginning of the basilar membrane respond to high frequencies of sound; the end of the membrane responds to lower frequencies.
Receptor neurons on different parts of the basilar membrane respond to different frequencies of sound to form a tonotopic map

How does the ear convert sound waves into electrical signals?

Auditory receptor cells (hair cells) have hairs that are attached to the basilar membrane and vibrate if the appropriate frequency is heard.
Vibrations of these hairs result in the physical opening and closing of ion channels - hair cells bent in one direction = depolarization; hair cells bent in the other direction = hyperpolarization.

What is the purpose of outer hair cells?

They redefine the shape of frequencies to tune into particular frequencies e.g. when you hear people talking about you, you tune into that conversation instead of others i.e. the cocktail party effect

What is the tectorial membrane?

- the membrane situated above the basilar membrane
- the outer hair cells are embedded in the tectorial membrane
- the outer hair cells can contract and relax which allows for further tuning as this changes the stiffness of the tectorial membrane
- the inner hair cells transduce the sound waves into nerve impulses

Where do hair cells send their axons?

To regions of the brainstem. These signals are then relayed to the midbrain, thalamus and cerebral cortex.

How do we detect where a sound is? (sound localization)

Sound localization results from integrating information from the two ears
i.e. sounds that originate on the left side of the body reach the left ear before the right ear. The difference in distance is detected by neurons in the brainstem and midbrain.

Where does conducting speech happen in the brain?

Frontal lobe

What is Broco's Aphasia?

The inability to speak fluently despite the presence of normal comprehension and intact vocal mechanisms i.e. difficulty getting the words out

Why can aphasia sufferers not read and write?

For reading & writing you need good communication between the processing language region and the producing language region. (these 2 areas are linked via the arcuate fasciculus)

Why do some people stutter?

Language initially develops in both hemispheres, but in 95% of people it shifts by the age of 5 to the left hemisphere.

Stutters = a disturbance to the lateralization of function i.e. stuttering is due to competition for dominance between the left and right hemisphere. Neither side can decide who is in control, so both try and produce words = stutter

What does the right hemisphere do in terms of language and music?

It makes some contribution to understanding the emotional content in language.

It also plays an important role in processing music e.g. Maurice Ravel suffered a left hemisphere stroke and developed aphasia. However, his ability to recognise melodies remained intact. Unfortunately his lesion meant that he could not put music to paper.
= left hemisphere is important in the language of music e.g. noting down a melody
= since the right hemisphere responds to music, it means if you have a stutter you can still sing perfectly

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