The ability of human observers to discriminate the orientation of a pair of straight lines
differing by 3° improved with practice. The improvement did not transfer across hemifield or …

This investigation is concerned with the spatial elaboration of retinal signals occurring in the
visual system. Guided by the recent electrophysiological evidence that retinal orientation is …

1. Human perceptual learning in discrimination of the oblique orientation was studied using
psychophysical methods. Subjects were trained daily to improve their ability to identify the …

Perceptual learning of orientation discrimination is reported to be precisely specific to the
trained retinal location. This specificity is often taken as evidence for localizing the site of …

Two experiments were conducted to determine the extent to which perceptual learning
transfers between orientation and direction discrimination. Naive observers were trained to …

Line orientation discrimination improves with selective practice for oblique orientations and
not for principal orientations. This training effect was observed with an identification task as …

Visual perception is fundamentally ambiguous because an infinite number of three-
dimensional scenes are consistent with our retinal images. To circumvent these ambiguities …

The contribution of decision factors to the meridional variations in line orientation
discrimination was determined for two-alternative forced-choice experimental designs …

Thresholds were measured for curvature, vernier offset and parallelism in line figures of
various sizes. Human performance was compared with that of a perfect processer using the …

Human perceptual learning is classically thought to be highly specific to trained stimuli's
retinal location. Together with evidence that specific learning effects can result in …