title: Bi-directional interactions between visual areas in the awake behaving cat.
abstract: The study of the cooperativity among cortical areas is essential to our understanding of brain functioning. Here we investigated the relative contributions of top-down and bottom-up directed interactions between area 17 and area 7 of the cat visual system. Bipolar local field potentials were recorded while the animals performed a go/no-go task or were in a quiet resting state. The data were analyzed by applying measures of interaction based on the Wiener-Granger causality concept. We found that during the visual task top-down directed interactions were of a similar magnitude as the bottom-up component. Second, interareal couplings tended to increase in conditions requiring a discriminative effort. Third, during behaviors not dominated by visual processing non-directed interactions increased.
authors.affiliation: Institute of Neuroinformatics, ETH/University Zürich, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Bernasconi
authors.forename: A
authors.initials: A
authors.lastname: von Stein
authors.forename: C
authors.initials: C
authors.lastname: Chiang
authors.forename: P
authors.initials: P
authors.lastname: König
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D002415:Cats; D004594:Electrophysiology; D066298:In Vitro Techniques; D010296:Parietal Lobe / Q000166:cytology* / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology; D014793:Visual Cortex / Q000166:cytology* / Q000502:physiology*; D014795:Visual Pathways / Q000166:cytology* / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology*