Bagaeva T, Podvigin N F, Podvigina D N, 2004, "Three types of gamma-oscillatory processes in the lateral geniculate nucleus of the cat visual system" Perception 33 ECVP Abstract Supplement
Three types of gamma-oscillatory processes in the lateral geniculate nucleus of the cat visual system
T Bagaeva, N F Podvigin, D N Podvigina
Gamma-oscillation characteristics in the responses of neurons of cat lateral geniculate nucleus to presentation of semitone and binary test images in their receptive fields were studied. Spectral characteristics (in the range of 20 - 100 Hz) of neuronal responses to adequate stimuli were analysed. 5930 peristimulus histograms of responses plotted on the basis of 177 900 neuronal impulse responses were examined. The following results were obtained: (a) Neurons that give rise to oscillations with significantly different frequencies in response to common stimuli were revealed in the set of cells. According to this feature, three types of neurons were described with oscillation mean values of 26.95 ± 4.35, 52.02 ± 9.05, and 85.79 ± 7.19 Hz (SD). (b) Mean values of gamma-oscillation dominant frequencies in responses of neurons of all three types remained constant (within the limits of scatter) with alteration of spatiotemporal parameters of stimuli. (c) Although the frequency ranges of the neuronal responses reported here are clearly separated from each other, there might exist a functional dependence between these ranges, with a simple numerical relationship of 1:2:3 being suggested. This relationship might indicate a potential functional coupling of neurons with oscillatory responses at an early stage of visual processing.
[The project was supported by Russian Foundation for Basic Research (project 02-04-49834).]
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