Speech Perception Then vs. Now

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Why specialized speech mechanisms?

Why speech is not

special?

1.

Motor Theory

2.

McGurk

Effect: indicates information pertaining to production (e.g., lip movements)

impacts perception of the

speech

signals

3.

Categorical

Perception: initially only found in humans for speech sounds.

4.

Selective

Adaptation Studies: showed shift in phonetic boundary thought to be evidence

of adapting special phonetic detectors

1.Categorical

Perception of non-

speech

sounds, in animals

2.Categorical

Perception may be one way we simplify

complex

speech (and other) sound signals

3.

Selective adaptation using the McGurk Effect shifts phonetic boundary as a

function of acoustic signal, not perceived phoneme