This volume presents an integrated view of how we perceive the spatial relations in our
visual world, covering anatomical, physiological, psychophysical, and perceptual aspects …

The perception of contrast was measured in humans by a technique of subjective contrast‐
matching, and was compared with contrast sensitivity as defined by threshold measures. 2 …

We present three lines of evidence indicating a low-level visual deficit in a large percentage
of specifically-disabled readers. This research is presented within the theoretical framework …

The present psychophysical experiments provide evidence for the existence of a variety of
detectors responding optimally to lines, edges or gratings. Their existence is revealed by …

Originally published in 1978, this study examines the shortcomings of some theoretical
approaches to psychological and neurophysiological mechanisms at the time. Keith Oatley …

Prolonged viewing of sinusoidal luminance gratings produces elevated contrast detection
thresholds for test gratings that are similar in spatial frequency and orientation to the …

Neurons in the visual cortex of monkeys and cats have been characterized as either (i) bar
and edge detectors or (ii) cells selective for certain spatial frequencies. To assess which of …

Contrast threshold elevation was measured in human observers at a single spatial
frequency (4 or 8 c/deg) after adaptation to gratings at different contrasts and spatial …

The usual method for studying mental processes entails taking words in linguistics--or
concepts in logic--and establishing the connections and relationships between them. Thus …

Cambridge CB2 3EG and the Psychological Laboratory, University of Cambridge, Cambridge
CB2 3EB are quite broad, having a half-wi Page 1 J. Phytiol. (1972), 225, pp. 437-455 437 With …