Human pitch perception is reflected in the timing of stimulus-related cortical activity.
'Pitch' refers to a sound's subjective highness or lowness, as distinct from 'frequency,' which refers to a sound's physical structure. In speech, music and other natural contexts, complex tones are often perceived with a single pitch. Using whole-head magnetoencephalography (MEG) and stimuli that dissociate pitch from frequency, we studied cortical dynamics in normal individuals who extracted different pitches from the same tone complexes. Whereas all subjects showed similar spatial distributions in the magnitude of their brain responses to the stimuli, subjects who heard different pitches exhibited contrasting temporal patterns of brain activity in their right but not their left hemispheres. These data demonstrate a specific relationship between pitch perception and the timing (phase) of dynamic patterns of cortical activity.
Patel
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The Neurosciences Institute, 10640 John Jay Hopkins Drive, San Diego, California 92121, USA. apatel@nsi.edu
Balaban
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E
D000161:Acoustic Stimulation / Q000379:methods*; D000328:Adult; D001303:Auditory Cortex / Q000033:anatomy & histology / Q000502:physiology*; D001931:Brain Mapping; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D015225:Magnetoencephalography; D008875:Middle Aged; D009474:Neurons / Q000502:physiology*; D015588:Observer Variation; D010898:Pitch Perception / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*; D013997:Time Factors