Speech Perception

Question 1

Define prelexical and potlexical code

Answer 1

• prelexical code: sound representations before a word is recognized
• postlesxical code: sound representations after a word has been identified

Question 2

Define co-articulation

Answer 2

the pronunciation of a phoneme depends on the preceding and following phonemes (ex. nasalization of /i/ in pin compared to pig

Question 3

What is hicock’s and Peoppel’s dual stream model? (3 main assumptions/components)

Answer 3

1) bilateral speech perception: both hemispheres take part in speech perception
2) difference between left and right sampling times
• LH look at speech signal at much finer grain, better at recognizing differences b/w phonemes, VOT
• RH: bigger units, stress patterns between different syllables
• auditory vs articulatory, needed so we can map what we say to what we hear, and vice versa
3) ventral (what) and dorsal (how) streams)

Question 4

What is hicock’s and Peoppel’s dual stream model? (3 main assumptions/components)

Answer 4

1) bilateral speech perception: both hemispheres take part in speech perception
2) difference between left and right sampling times
• LH look at speech signal at much finer grain, better at recognizing differences b/w phonemes, VOT
• RH: bigger units, stress patterns between different syllables
• auditory vs articulatory, needed so we can map what we say to what we hear, and vice versa
3) ventral (what) and dorsal (how) streams)

Question 5

What did Poeppel et al. find about the L and R hemisphere?

Answer 5

Both hemispheres create similar high-fidelity representations of incoming sounds but later sample from these with different rates: LH in 20-80ms chnks RH in 150-300ms chunks