Neural correlates of gap detection and auditory fusion in cat auditory cortex.
Responses were recorded from 130 single neurones in the primary auditory cortex of 12 ketamine-anaesthetized cats in response to double-click stimuli, to a /ba/-/pa/ phoneme continuum and to gaps inserted early (after 5 ms) and late (after 500 ms) in a 1 s duration noiseburst. Stimulus levels were between 45 and 75 dB SPL. Neural detection threshold for the 'late gap' was less than 5 ms. For the double click and 'early gap' stimuli thresholds were between 40 and 50 ms, whereas the phoneme continuum threshold for voice-onset-time (VOT) was between 10 and 25 ms. The 'late gap' and VOT thresholds are similar to psychophysical gap detection and the /ba/-/pa/ categorical perception boundary respectively.
Department of Psychology, University of Calgary, Alberta, Canada.
J J
JJ
Eggermont
D000161:Acoustic Stimulation; D000818:Animals; D001303:Auditory Cortex / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D001309:Auditory Threshold / Q000502:physiology*; D001522:Behavior, Animal / Q000502:physiology; D002415:Cats; D004594:Electrophysiology; D009474:Neurons / Q000502:physiology; D009622:Noise; D011571:Psychoacoustics; D013997:Time Factors; D014831:Voice