title: Stimulus-dependent augmented gamma oscillatory activity between the functionally connected cortical neurons in the primary visual cortex.
abstract: Neuronal assemblies typically synchronise within the gamma oscillatory band (30-80 Hz) and are fundamental to information processing. Despite numerous investigations, the exact mechanisms and origins of gamma oscillations are yet to be known. Here, through multiunit recordings in the primary visual cortex of cats, we show that the strength of gamma power (20-40 and 60-80 Hz) is significantly stronger between the functionally connected units than between the unconnected units within an assembly. Furthermore, there is increased frequency coherence in the gamma band between the connected units than between the unconnected units. Finally, the higher gamma rhythms (60-80 Hz) are mostly linked to the fast-spiking neurons. These results led us to postulate that gamma oscillations are intrinsically generated between the connected units within cell assemblies (microcircuits) in relation to the stimulus within an emergent '50-ms temporal window of opportunity'.
authors.affiliation: Neurophysiology of the Visual System, Département de Sciences Biologiques, Université de Montréal, CP 6128 Succursale centre-ville, Montréal, QC, H3C 3J7, Canada.
authors.forename: Vishal
authors.initials: V
authors.lastname: Bharmauria
authors.affiliation: Neurophysiology of the Visual System, Département de Sciences Biologiques, Université de Montréal, CP 6128 Succursale centre-ville, Montréal, QC, H3C 3J7, Canada.
authors.forename: Lyes
authors.initials: L
authors.lastname: Bachatene
authors.affiliation: Neurophysiology of the Visual System, Département de Sciences Biologiques, Université de Montréal, CP 6128 Succursale centre-ville, Montréal, QC, H3C 3J7, Canada.
authors.forename: Sarah
authors.initials: S
authors.lastname: Cattan
authors.affiliation: Neurophysiology of the Visual System, Département de Sciences Biologiques, Université de Montréal, CP 6128 Succursale centre-ville, Montréal, QC, H3C 3J7, Canada.
authors.forename: Nayan
authors.initials: N
authors.lastname: Chanauria
authors.affiliation: Neurophysiology of the Visual System, Département de Sciences Biologiques, Université de Montréal, CP 6128 Succursale centre-ville, Montréal, QC, H3C 3J7, Canada.|Département de Génie Électrique et Génie Informatique, Université de Sherbrooke, Sherbrooke, QC, Canada.
authors.forename: Jean
authors.initials: J
authors.lastname: Rouat
authors.affiliation: Neurophysiology of the Visual System, Département de Sciences Biologiques, Université de Montréal, CP 6128 Succursale centre-ville, Montréal, QC, H3C 3J7, Canada.|Département de Génie Électrique et Génie Informatique, Université de Sherbrooke, Sherbrooke, QC, Canada.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Molotchnikoff
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000818:Animals; D002415:Cats; D004569:Electroencephalography; D065818:Gamma Rhythm / Q000502:physiology*; D009415:Nerve Net / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000502:physiology*; D009949:Orientation / Q000502:physiology; D010507:Periodicity; D010775:Photic Stimulation; D013223:Statistics as Topic; D014793:Visual Cortex / Q000166:cytology*
keywords: coherence; functional connection; gamma oscillations; primary visual cortex; window of opportunity