Apparent Size as a Determiner of Figural After‐effects. I

Abstract

Apparent size as a determiner of figural after-effects. 11. Scand. J. Psychol., 1968, 9 , 237-~40.-A brightly illuminated circle (TF) was flashed at distance d. The subject projected the after-image of T F on a screen placed at distance 4 2 , and fixated the after-image, which appeared to be half the size of the stimulus figure. Then T F and a comparison circle (CF) of equal size were shown, faintly illuminated, at distance d. A clear-cut figural after-effect occurred T F was perceived to be larger. It is suggested that T F appeared dimmer after the fixation and was perceived to be farther away than CF. As a consequence of this T F looked larger.

Apparent Size as a Determiner of Figural After‐effects. Iii

“…I. The inspection card (a) and the test card (b) in the earlier experiment (Kolehmainen, 1968). All four circles were of equal size.…”

“…It was shown in an earlier paper (Kolehmainen, 1968) that, e.g., the inspection pattern illustrated in Fig. l a produced an after-effect (FAE) in the test figure (TF) shown in Fig.…”

Apparent distance vs. apparent size as determiners of figural after‐effects

“…There is, however, evidence that retinal size and apparent size are not exhaustive as determiners of FAE. In Kolehmainen's (1968Kolehmainen's ( , 1969 experiments retinally and physically identical IFs and TFs were used. Two simultaneously presented IFs differed in apparent depth because of gradient effects.…”

“…The present work is designed to investigate the hypothesis presented by Kolehmainen (1968). Sutherland's original experiment is repeated as such.…”