The effect of moving textures on the responses of cells in the cat's dorsal lateral geniculate nucleus.
Neurons in the dorsal lateral geniculate nucleus (dLGN) of the anaesthetized cat were activated with test stimuli (flashing spots, counterphased gratings and moving bars) in the presence of a moving background texture. Moving texture alone produced mild excitation, as a result of stimulation of the receptive field centre. Fast moving coarse textures were more effective than fine slow moving textures. The predominant effect of texture motion, however, was to reduce the response to all test stimuli displayed in the receptive field centre. The effects were similar for X- and Y-like cells. In the case of flashed spots, the sustained response was more strongly suppressed than the transient response. The direction of motion of the texture and differences in the relative motion of bar and texture had no influence on the degree of suppression. These observations are similar to effects seen on cat retinal ganglion cells, and are probably a form of gain control. Such suppressive effects are transmitted to the cortex and are likely to be evoked by large gratings, textures and by natural stimuli, all of which activate extensive regions of the receptive field surround.
Girardin
Cyrille C
CC
Institute of Neuroinformatics, ETHZ/UNIZH, Winterthurerstrasse 190, Y55, CH-8057 Zurich, Switzerland.
Kiper
Daniel C
DC
Martin
Kevan A C
KA
D000200:Action Potentials / Q000502:physiology*; D000818:Animals; D002415:Cats; D023882:Dominance, Ocular / Q000502:physiology; D005829:Geniculate Bodies / Q000502:physiology*; D009039:Motion Perception / Q000502:physiology*; D009433:Neural Inhibition / Q000502:physiology; D009474:Neurons / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D009435:Synaptic Transmission / Q000502:physiology; D014794:Visual Fields / Q000502:physiology