PubMed Health⌕ Search

Biomedical subjects

A R Gellatly

Publications and source records attributed to A R Gellatly.

6 recordsLinked to original sources
PubMed1982

Perceptual learning of illusory contours and colour.

An adequate account of the phenomena of illusory contours (ICs) will require an understanding of the genesis of such effects. There are two main techniques used to study perceptual genesis: the first is to slow down the relevant perceptual processes and to study them during perceptual learning; the second employs tachistoscopic exposures and backward masking. To date the technique of perceptual learning has not been shown to be applicable in the case of ICs. Two experiments are reported in which perceptual learning is used to study ICs. It is demonstrated that subjects can learn to see, first, illusory contours and, second, illusory colour. The suggestion is made that although there may be different kinds of illusory phenomena which may arise in different ways, these may all depend upon a common set of mechanisms.

Color Perception↗
PubMed1980

Perception of an illusory triangle with masked inducing figure.

Subjects viewed the Kanizsa triangle under conditions of visual masking. Depending on the type of mask employed, the triangle could be perceived when the inducing discs were not phenomenally present, or the discs could be seen with the triangle not present. These findings suggest that no single set of mechanisms, physiological or cognitive, will suffice to explain perception of the illusory triangle.

Consciousness↗
PubMed1975

The effects of negative relatedness upon word-picutre and word-word comparisons and subsequent recall.

In two experiments subjects were required to compare the meanings of either a word and a picture, or of two words. Different name levels, i.e. category versus superordinate names, had only a small effect on the time to compare a name with a picture. When incongruent stimulus pairs were semantically related, both positive and negative decision times were longer than when the incongruent pairs were unrelated; relatedness also affected subjects' recall of stimuli. Implications for models of semantic decision are discussed.

Association↗