Multiple-unit responses to pitch changes in rabbits.
Multiple-unit activity (MUA) was recorded from the hippocampus (Hc), the visual cortex (VCx) and the cerebellar cortex (CerCx) in rabbits when pitch deviant tones were presented in a series of standard tones (oddball situation) and when standard tones were absent (deviant-alone situation). Significant MMN-like responses (deviant responses minus standard responses in the oddball situation) occurred in Hc, reflecting a MUA increase to the standards and its decrease to the deviants. In accordance with parallel ERPs reported earlier, the MMN-like responses reflected responses only to different presentation frequencies of stimuli. Non-selectivity in the pitch of such responses in VCx and a lack of an effect of the different stimulus repetition frequencies on responses in CerCx resulted in absent MMN-like responses in both of these locations.
Ruusuvirta
T
T
University of Jyväskylä, Department of Psychology, Finland.
Korhonen
T
T
Arikoski
J
J
Kivirikko
K
K
D000818:Animals; D002525:Cerebellar Cortex / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D006624:Hippocampus / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D010897:Pitch Discrimination / Q000502:physiology*; D011817:Rabbits; D014793:Visual Cortex / Q000502:physiology*