title: Spike synchronization in cat primary visual cortex depends on similarity of surround-suppression magnitude.
abstract: In the primary visual cortex (V1), the spike synchronization seen in neuron pairs with non-overlapping receptive fields can be explained by similarities in their preferred orientation (PO). However, this is not true for pairs with overlapping receptive fields, as they can still exhibit spike synchronization even if their POs are only weakly correlated. Here, we investigated the relationship between spike synchronization and suppressive modulation derived from classical receptive-field surround (surround suppression). We found that layer 4 and layer 2/3 pairs exhibited mainly asymmetric spike synchronization that had non-zero time-lags and was dependent on both the similarity of the PO and the strength of surround suppression. In contrast, layer 2/3 and layer 2/3 pairs showed mainly symmetric spike synchronization that had zero time-lag and was dependent on the similarity of the strength of surround suppression but not on the similarity in POs. From these results, we propose that in cat V1 there exists a functional network that mainly depends on the similarity in surround suppression, and that in layer 2/3 neurons the network maintains surround suppression that is primarily inherited from layer 4 neurons.
authors.affiliation: Laboratory of Cognitive and Behavioral Neuroscience, Graduate School of Medicine, Osaka University, Health and Sport Science Building, 1-17 Machikaneyama, Osaka, Toyonaka, 560-0043, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Naito
authors.affiliation: Laboratory of Cognitive and Behavioral Neuroscience, Graduate School of Medicine, Osaka University, Health and Sport Science Building, 1-17 Machikaneyama, Osaka, Toyonaka, 560-0043, Japan.
authors.forename: Takuji
authors.initials: T
authors.lastname: Kasamatsu
authors.affiliation: Laboratory of Cognitive and Behavioral Neuroscience, Graduate School of Medicine, Osaka University, Health and Sport Science Building, 1-17 Machikaneyama, Osaka, Toyonaka, 560-0043, Japan.
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Sato
mesh_terms: D000818:Animals; D002415:Cats; D003344:Cortical Synchronization; D005074:Evoked Potentials, Visual; D014793:Visual Cortex / Q000502:physiology*
keywords: cross-correlation; spike synchrony; suppression from outside the receptive field; surround suppression-dependent network