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Acoustic versus perceptual accounts of speaker differentiation within anterior auditory cortex Nicolas J. Abreu Carolyn McGettigan Sophie K. Scott Institute.

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Presentation on theme: "Acoustic versus perceptual accounts of speaker differentiation within anterior auditory cortex Nicolas J. Abreu Carolyn McGettigan Sophie K. Scott Institute."— Presentation transcript:

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2 Acoustic versus perceptual accounts of speaker differentiation within anterior auditory cortex Nicolas J. Abreu Carolyn McGettigan Sophie K. Scott Institute of Cognitive Neuroscience, UCL

3 Background To what extent does auditory cortex show sensitivity to the perceptual differences between speakers over and above the acoustic differences? Speaker identity F0 and VTL

4 Design Continuous carry-over design (Aguirre 2007) [Feasible?] Investigate perceptual/acoustic effects in most efficient manner BOLD activity = mean activity + direct effect + carry-over effect of previous stim Stimuli presented in unbroken sequence Passive Listening, 1 second sound + 1 second silence, 17 speakers + 1 null Stimulus Order type 1 index 1 sequences – include self-adjacencies, each ordered pair of stimuli occurs once in each sequence e.g. (0) Carry-over Parameters of Interest Acoustic Distance & Perceptual Distance Belin et al 2003

5 Proposal 20 adult normal controls Single condition, 325 trials per run, 3 runs, min/run excl dummy scans Whole-brain scan, TR = 3000, TE = 30, 42 axial slices, interleaved, 64x64 resolution Parametric regressors: Carry-overs, F0, VTL, Naturalness, Gender 10 min Voice-sensitive area localizer a la Belin et al sec vocal blocks, 20 8 sec nonvocal blocks, sparse sampling, TR = 10 sec, 61 total volumes Use for subject-by-subject functionally-defined ROI Behavioral Post-test: How different are these two speakers? MDS


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