Visually-triggered oscillations in the cat lateral posterior-pulvinar complex.
The so-called 40 Hz oscillations are found at almost all stages of visual processing are thought to play a critical role in perception. The goal of this investigation was to look at the presence of stimulus-specific oscillations in the lateral posterior-pulvinar complex of the thalampus (LP-P) for which the oscillations were still not described. Rhythmic patterns in multiunit LP-P activity of anaesthetized cats were revealed in 14% of recording sites. With the exception of one pool of LP-P cells that exhibited stimulus-dependent rhythmic activity approximately 130 Hz, 90% of autocorrelograms were modulated between 18 and 74 Hz with dominant frequencies of 20-33 Hz. Since the LP-P sends efferents to the visual cortex it seems possible that oscillations from the LP-P can propagate to cortical neurones, especially to complex cells, for which similar dominant frequencies were noted by previous investigators.
Shumikhina
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Département de Sciences Biologiques, Université de Montréal, Québec, Canada.
Molotchnikoff
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D000758:Anesthesia; D000818:Animals; D002415:Cats; D009474:Neurons / Q000502:physiology; D009949:Orientation / Q000502:physiology; D010775:Photic Stimulation; D013787:Thalamic Nuclei / Q000166:cytology / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology; D014796:Visual Perception / Q000502:physiology