1979 volume 8(5) pages 487 – 495
doi:10.1068/p080487

Cite as:
Anstis S M, 1979, "Interactions between simultaneous contrast and adaptation to gradual change of luminance" Perception 8(5) 487 – 495
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Interactions between simultaneous contrast and adaptation to gradual change of luminance

Stuart M Anstis

Received 3 August 1978, in revised form 21 March 1979

Abstract. Following adaptation to a field of light which was modulated by a rising ramp so that it repetitively grows gradually brighter, a steady test field of light appears to be gradually growing dimmer. In this study, if a small grey spot of constant luminance was centred in the brightening field, it appeared to be growing gradually dimmer by simultaneous contrast. This apparent dimming led to a brightening aftereffect in the spot. It was shown that this spot aftereffect had two independent components: the apparent dimming of the adapting spot produced its own aftereffect (contrast produced an aftereffect) and also the dimming aftereffect in the surround field spatially induced an aftereffect into the spot during the test period (aftereffect produced simultaneous contrast). Thus simultaneous contrast can both precede and follow successive contrast in the visual system.

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