Temporal aspects of spatial adaptation. A study of the tilt aftereffect

Magnussen, Svein; Johnsen, Tore

doi:10.1016/0042-6989(86)90014-3

Cited by 86 publications

(81 citation statements)

References 37 publications

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“…The individual growth and decay functions of the aftereffect have approximately the same slope, thus adaptation and recovery appear to be fairly symmetric processes. This has also been reported for the tilt aftereffect (Magnussen and Johnsen, 1986).…”

Section: Discussionsupporting

confidence: 82%

“…However, Mecacci and Spinelli (1976) reported that the amplitude reduction observed in the human visual evoked potentia1 first stabilized after 15 min adaptation to high-contrast gratings. Some later psychophysical results by Bodinger (1978) likewise suggested that it might take longer adaptation times to reach magnitude saturation, and recent extensive experiments on the threshold elevation and tilt aftereffects show that there is a steady growth during at least 20-30 min of adaptation (Bjiirklund and Magnussen, 1981;Rose and Evans, 1983;Magnussen and Johnsen, 1986). There is no evidence for saturation in these experiments.…”

Section: Introductionmentioning

confidence: 78%

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Marathon adaptation to spatial contrast: Saturation in sight

Magnussen

Greenlee

1985

Vision Research

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Abstract-The contrast thresholds for detecting a 6.0 c/deg vertical sinusoidal test grating were tracked during and after 3 hr inspection of a high-contrast adapting grating of the same spatial frequency and orientation. Log contrast threshold increased linearly with log adaptation time, attaining a final stable value after approximately 30 and 60 min of adaptation for the two subjects tested. The recovery function was likewise linear on double logarithmic axes. The results further suggest that adaptation beyond the saturation point had no influence on the subsequent rate of recovery.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 78%

Marathon adaptation to spatial contrast: Saturation in sight

Magnussen

Greenlee

1985

Vision Research

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“…Similarly, the straight lines in figure 4d indicate that the aftereffect decay is nearly exponential over time. Note that this exponential decay is characteristic of aftereffects of motion (Sekuler 1975; Keck & Pentz 1977), orientation (Wolfe 1984;Magnussen & Johnsen 1986;Harris & Calvert 1989) and shape (Krauskopf 1954). We next considered a more subtle aspect of the adaptation dynamics, again for purposes of comparison to previous work.…”

Section: Resultsmentioning

confidence: 99%

The dynamics of visual adaptation to faces

Rhodes²,

et al. 2005

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Several recent demonstrations using visual adaptation have revealed high-level aftereffects for complex patterns including faces. While traditional aftereffects involve perceptual distortion of simple attributes such as orientation or colour that are processed early in the visual cortical hierarchy, face adaptation affects perceived identity and expression, which are thought to be products of higher-order processing. And, unlike most simple aftereffects, those involving faces are robust to changes in scale, position and orientation between the adapting and test stimuli. These differences raise the question of how closely related face aftereffects are to traditional ones. Little is known about the build-up and decay of the face aftereffect, and the similarity of these dynamic processes to traditional aftereffects might provide insight into this relationship. We examined the effect of varying the duration of both the adapting and test stimuli on the magnitude of perceived distortions in face identity. We found that, just as with traditional aftereffects, the identity aftereffect grew logarithmically stronger as a function of adaptation time and exponentially weaker as a function of test duration. Even the subtle aspects of these dynamics, such as the power-law relationship between the adapting and test durations, closely resembled that of other aftereffects. These results were obtained with two different sets of face stimuli that differed greatly in their low-level properties. We postulate that the mechanisms governing these shared dynamics may be dissociable from the responses of feature-selective neurons in the early visual cortex.

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“…The slope parameter does not significantly differ from unity at the 0.01 probability level, suggesting that the proportionality rule holds within this range. This proportionality rule also appears to hold for the suprathreshold appearance of the orientation of lines or gratings following adaptation, as the buiIdup and decay of the tilt aftereffect show similar time courses (Magnussen & Johnsen, 1986;Greeniee & Magnussen, 1987). Thus, contrast adaptation appears to be like a short-term memory store where the effects of adaptation persist for a length of time proportional to the adapting time.…”

Section: Contrast Gain Control and Neurai Memorymentioning

confidence: 99%

The time course of adaptation to spatial contrast

et al. 1991

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Abstract-We explored the buildup and decay of threshold elevation during and after adaptation to sinewave gratings in a series of experiments investigating the effects of adapting time, adapting contrast, spatial frequency and retinal eccentricity. Contrast thresholds for vertical sinewave gratings truncated in space by a one-dimensional Gaussian envelope were measured before and after adaptation to a full-field suprathreshold grating of the same spatial frequency and orientation. Thresholds were measured intermittently after adaptation in a "seen/not-seen" single presentation procedure until these thresholds returned to baseline values. The first test grating was presented 300 msec after the offset of the adapting stimulus, and thereafter at regular intervals. At different times after adaptation, contrast thresholds were estimated by off-line analysis of the data using the QUEST algorithm. Adapting time was either 1, 10, 108 or 1000 set and adapting contrast was either 9, 19, 29 or 39 dB (re. 1%). The test gratings were presented centered either at the fixation point or at 5 and 10 deg eccentricity along the horizontal meridian. The results suggest that up to the saturation level the buildup and the decay of adaptation to contrast is well described by a power function of time. The slope of the best fitting line on log-log axes is fairly constant for the adaptation times tested. As reported earlier, thresholds increased with adapting contrast and these contrast-dependent differences were evident 3OOmsec after the termination of adaptation. Adaptation at 10 deg eccentricity yielded slightly higher threshold elevations than for central vision. Based on these results, a description is given of the dynamic response of the underlying neural mechanisms.

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Temporal aspects of spatial adaptation. A study of the tilt aftereffect

Cited by 86 publications

References 37 publications

Marathon adaptation to spatial contrast: Saturation in sight

Marathon adaptation to spatial contrast: Saturation in sight

The dynamics of visual adaptation to faces

The time course of adaptation to spatial contrast

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