Auditory Cortex – 3

Jonathan Fritz(with thanks to Xiaoqin Wang)

Temporal Processing: How does the cortex represent time‐varying signals?Coding of time‐varying signalsTemporal‐to‐rate transformation in A1 and beyond   Spectral and Intensity Processing  Speech and Pitch Processing 

Outline: Lecture 3

Temporal Processing: How does the cortex represent time‐varying signals?Coding of time‐varying signalsTemporal‐to‐rate transformation in A1 and beyond   Spectral and Intensity Processing  Speech and Pitch Processing

Outline: Lecture 3

Auditory Cortical Receptive Fields in Bats

Temporal Processing: How does the cortex represent time‐varying signals?Coding of time‐varying signalsTemporal‐to‐rate transformation in A1 and beyond   Spectral and Intensity Processing  Speech and Pitch Processing 

Outline: Lecture 3

Stimulus vs Percept Continuity Illusion 

• Context influences ambiguous stimuli in vision

• What about basic auditory features, such as pitch?

Chambers & Pressnitzer, in prep.

Effects of context in the perception of ambiguous pitch

You will hear a sequence of tones, a short pause, and then two final tones. Is pitch going up or down between the two final tones?

Sequence A Sequence B

Effects of context in the perception of ambiguous pitchChambers & Pressnitzer, in prep.

You will hear a sequence of tones, a short pause, and then two final tones. Is pitch going up or down between the two final tones?

Sequence A Sequence B

Effects of context in the perception of ambiguous pitchChambers & Pressnitzer, in prep.

Effects of context in the perception of ambiguous pitch

• Ambiguous pitch stimuli: Shepard tones, tritone interval(Shepard, 1964; Deutsch, 1987; Giangrande et al., 2003)

• Biasing tones: more Shepard tones, within a half-octave range

Chambers & Pressnitzer, in prep.