Auditieve waarneming - Basic processing of auditory information

4 important questions on Auditieve waarneming - Basic processing of auditory information

What is the specialization for 'what' versus 'where' in the auditory corticol areas?

Some neurons/regions are relatively specialized for coding the content of the sound and other neurons/regions are relatively specialized for coding there the sound is coming from.

What are the two seperate routes to non-auditory regions?

A dorsal route involving the parietal lobes that is concerned with locating sounds.

A ventral route along the temporal lobes concerned with identifying sounds.

What are the two braid solutions for identifying where a sounds is located?

1. Inter-aural differences: sound will tend to arrive at one ear before the other.

2. Distortions of the sound wave by the head an pinnae: The brain develops an internal model of how sounds get distorted by the unique shape of one's own ears and head (called a Head-related transfer funtion HRTF) and it is able to use this knowledge to infer the likely location.
They propose that a region called the planum temporale is involved in integrating the sensory input with the learned HRTF for different parts of space.
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What is the theory of the best developed model of auditory memory?

They regard the primary function of this memory system to lie in early auditory stream segregation. Complex auditory scenes can be divided into different streams according to their pitch, melody, instrumentation or location in space.

This comes from studies of a human ERP component termed the mismatch negativity (MMN). The MMN occurs when an auditory stimulus deviates from previously presented auditory stimuli.

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