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Responses of single cells in cats lateral geniculate nucleus and area 17 to the velocity of moving visual stimuli

Responses of single cells in cats lateral geniculate nucleus and area 17 to the velocity of moving visual stimuli

Experimental Brain Research 34(2): 273-286

Neuronal responses to moving visual stimuli were recorded in the lateral geniculate nucleus (LGN) and area 17 of cats. Response duration (DE), number of spikes (NT) and mean frequency (FM) were estimated from the response histograms and analyzed for their dependence on stimulus velocity. In the LGN, for about 2/3 of the cells these response parameters changed monotonically with velocity up to about 100.degree./s. In 1/3 of the cells, the response frequency was tuned to velocity. The speed at which individual cells reached a peak or plateau firing rate was correlated with their receptive field size. In area 17, most neurons were tuned to velocity. Out of 59 cells 9 were insensitive to stimulus speed in that they responded equally well at stimulus velocities up to about 10.degree./s. At higher levels in the nervous system information about velocity is represented in discrete groups of neurons. Different response parameters may be relevant for different perceptual phenomena associated with movement. The significance of integrational properties and lateral inhibition of nerve cells for the development of complex response properties is discussed.

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Accession: 006329226

Download citation: RISBibTeXText

PMID: 421751

DOI: 10.1007/bf00235673

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