Stimuli outside the classical receptive field modulate the synchronization of action potentials between cells in visual cortex of cats.
It is proposed that various attributes of an image are bound neuronally when responsive units fire in synchrony. Our investigations describe the influences of the contextual stimuli upon the occurrence of synchronization, in anaesthetized cats. Once a significant synchronization was recorded in the cross-correlogram (XCRG) between evoked action potentials of two groups of neurons in response to a drifting sine-wave grating, additional gratings were positioned outside the compound receptive field. The synchronization strength was then measured in relation to the difference between the orientations of the central and peripheral gratings. In the majority of cases results indicate that the synchronization is facilitated with larger orientation disparities. Thus, our data support the notion that contrasting features of images facilitate synchrony of activity between neurons.
Bretzner
F
F
Département des Sciences Biologiques, Université de Montréal, PQ, Canada.
Aïtoubah
J
J
Shumikhina
S
S
Tan
Y F
YF
Molotchnikoff
S
S
D000200:Action Potentials / Q000502:physiology*; D000758:Anesthesia; D000818:Animals; D002415:Cats; D004567:Electrodes, Implanted; D009474:Neurons / Q000502:physiology*; D009949:Orientation / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods*; D009435:Synaptic Transmission / Q000502:physiology*; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology*