Functional Anatomy of Spoken Input
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Functional Anatomy of Spoken Input • Note that the low- level auditory pathway is not specialized for speech sounds – Both speech and non- speech sounds activate primary auditory cortex (bilateral Heschl’s Gyrus) on the top of the superior temporal gyrus
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Functional Anatomy of Spoken Input. Note that the low-level auditory pathway is not specialized for speech sounds Both speech and non-speech sounds activate primary auditory cortex (bilateral Heschl’s Gyrus ) on the top of the superior temporal gyrus. Functional Anatomy of Spoken Input. - PowerPoint PPT Presentation
Transcript of Functional Anatomy of Spoken Input
Functional Anatomy of Spoken Input
• Note that the low-level auditory pathway is not specialized for speech sounds– Both speech and non-speech
sounds activate primary auditory cortex (bilateral Heschl’s Gyrus) on the top of the superior temporal gyrus
Functional Anatomy of Spoken Input
• Which parts of the auditory pathway are specialized for speech?
• Binder et al. (2000)– fMRI– Presented several kinds of stimuli:• white noise• pure tones• non-words• reversed words• real words
These have non-word-like acoustical properties
These have word-like acoustical properties but no lexical associations
word-like acoustical properties and lexical associations
Functional Anatomy of Spoken Input
• Relative to “baseline” scanner noise– Widespread auditory cortex
activation (bilaterally) for all stimuli
– Why isn’t this surprising?
Functional Anatomy of Spoken Input
• Statistical contrasts reveal specialization for speech-like sounds– superior temporal gyrus– Somewhat more prominent on left side
Functional Anatomy of Spoken Input
• Further contrasts to identify specialization for words relative to other speech-like sounds revealed only a few small clusters of voxels
• Brodmann areas– Area 39– 20, 21 and 37– 46 and 10
