Functional alignment of feedback effects from visual cortex to thalamus.
Following from the classical work of Hubel and Wiesel, it has been recognized that the orientation and the on- and off-zones of receptive fields of layer 4 simple cells in the visual cortex are linked to the spatial alignment and properties of the cells in the visual thalamus that relay the retinal input. Here we present evidence showing that the orientation and the on- and off-zones of receptive fields of layer 6 simple cells in cat visual cortex that provide feedback to the thalamus are similarly linked to the alignment and properties of the receptive fields of the thalamic cells they contact. However, the pattern of influence linked to on- and off-zones is phase-reversed. This has important functional implications.
Wang
Wei
W
Institute of Ophthalmology, University College London, Bath Street, London EC1V 9EL, UK.
Jones
Helen E
HE
Andolina
Ian M
IM
Salt
Thomas E
TE
Sillito
Adam M
AM
D000200:Action Potentials / Q000187:drug effects / Q000502:physiology; D000818:Animals; D001931:Brain Mapping; D002415:Cats; D005246:Feedback; D018756:GABA Antagonists / Q000494:pharmacology; D005829:Geniculate Bodies / Q000166:cytology / Q000502:physiology*; D007478:Iontophoresis / Q000379:methods; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D010721:Phosphinic Acids / Q000494:pharmacology; D010775:Photic Stimulation / Q000379:methods; D011412:Propanolamines / Q000494:pharmacology; D013997:Time Factors; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology*
D018756:GABA Antagonists; D010721:Phosphinic Acids; D011412:Propanolamines; C085075:CGP 55845A