title: Integration of orientation information in amblyopia.
abstract: A recent report suggests that amblyopes are deficient in processing local orientation at supra-threshold contrasts. To determine whether amblyopes are also poor at integrating local orientation signals, we assessed performance for an orientation integration task in which the orientations of static signals are integrated across space. Our results show that amblyopic visual systems can integrate local static oriented signals with the same level of efficiency as normal visual systems. Although internal noise was slightly elevated, there was no indication that fewer samples were used to achieve optimal performance. This finding suggests normal integration of local orientation signals in amblyopia.
authors.affiliation: McGill Vision Research Unit, 687 Pine Avenue West, Rm. H4-14, Montreal, Quebec, Canada H3A 1A1. behzad.mansouri@mail.mcgill.ca
authors.forename: Behzad
authors.initials: B
authors.lastname: Mansouri
authors.forename: Harriet A
authors.initials: HA
authors.lastname: Allen
authors.forename: Robert F
authors.initials: RF
authors.lastname: Hess
authors.forename: Steven C
authors.initials: SC
authors.lastname: Dakin
authors.forename: Oliver
authors.initials: O
authors.lastname: Ehrt
mesh_terms: D000328:Adult; D000550:Amblyopia / Q000503:physiopathology / Q000523:psychology*; D004192:Discrimination, Psychological; D006801:Humans; D008875:Middle Aged; D009949:Orientation; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D012684:Sensory Thresholds; D013028:Space Perception