title: Poststroke conscious visual deficit: clinical course and changes in cerebral activations.
abstract: OBJECTIVE
  Little is known about the outcome and recovery mechanisms of visual perception after a focal lesion of the occipital lobe in humans, especially after stroke. In this study, the authors aimed to describe the clinical course and the neural substrates of conscious perceptive visual deficit after posterior cerebral artery infarct.
  
  
  METHODS
  The authors prospectively included 8 patients (7 men and 1 woman; mean age, 64.6 ± 18 years) with visual deficit induced by partial damage of the striate cortex related to acute posterior cerebral artery infarct. Conscious perception of color and motion was assessed from the acute phase to the third month. Functional magnetic resonance imaging was performed to investigate neural substrates of visual recovery.
  
  
  RESULTS
  In the acute phase of stroke, visual deficiency was global (3/8 patients), selective to color (4/8 patients), or selective to motion (1/8 patients). During the follow-up, visual performance increased with respect to color (from 29% to 70%; P < .005) and with respect to motion (from 47% to 74%; P < .005). Despite a lack of ipsilesional V1 area activation in the acute phase, activations in this area and in the contralesional extrastriate cortex were obtained during follow-up. Both ipsilesional and contralesional V4 activations were correlated with better outcome.
  
  
  CONCLUSIONS
  Extensive visual recovery occurs early after partial acute posterior cerebral artery infarct. Spared islands in ipsilesional V1 area and transcallosal pathways might be involved in poststroke visual recovery.
authors.affiliation: Service de Neurologie Vasculaire ; Fédération de Neurologie; Hôpital Purpan, Toulouse Cedex 9, France. raposo.n@chu-toulouse.fr
authors.forename: Nicolas
authors.initials: N
authors.lastname: Raposo
authors.forename: Alexandra Séverac
authors.initials: AS
authors.lastname: Cauquil
authors.forename: Jean François
authors.initials: JF
authors.lastname: Albucher
authors.forename: Blandine
authors.initials: B
authors.lastname: Acket
authors.forename: Simona
authors.initials: S
authors.lastname: Celebrini
authors.forename: Jérémie
authors.initials: J
authors.lastname: Pariente
authors.forename: Christophe
authors.initials: C
authors.lastname: Cognard
authors.forename: Isabelle
authors.initials: I
authors.lastname: Loubinoux
authors.forename: François
authors.initials: F
authors.lastname: Chollet
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000098:blood supply / Q000503:physiopathology*; D016009:Chi-Square Distribution; D003118:Color Perception / Q000502:physiology; D003243:Consciousness; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D010775:Photic Stimulation / Q000379:methods; D020521:Stroke / Q000150:complications*; D013647:Task Performance and Analysis; D014786:Vision Disorders / Q000209:etiology* / Q000473:pathology*; D014794:Visual Fields / Q000502:physiology
chemical_list: D010100:Oxygen