Hippocampal event-related potentials to pitch deviances in an auditory oddball situation in the cat: experiment I.
Hippocampal event-related potentials (ERP) in the areas CA1, CA3, and dentate fascia (Df) were recorded in cats during an oddball situation when pitch deviant tones occurred in a series of standard tones. When difference waves were calculated by subtracting ERPs to the standard tones from those to the deviant tones, no clear N40d, corresponding to a cat analogue of the human mismatch negativity (MMN) observed in earlier studies, could be detected. Instead, a prominent later negativity (N130d) was observed. A possible extra-hippocampal source of the process reflected by the MMN-like negativity, and a relation between an orienting response (OR) and the N130d are discussed.
Department of Psychology, University of Jyväskylä, Finland.
T
T
Ruusuvirta
T
T
Korhonen
M
M
Penttonen
J
J
Arikoski
K
K
Kivirikko
D000161:Acoustic Stimulation; D000818:Animals; D002415:Cats; D018891:Dentate Gyrus / Q000502:physiology; D004567:Electrodes, Implanted; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D006624:Hippocampus / Q000502:physiology*; D009949:Orientation / Q000502:physiology