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Results for “FIGURAL AFTEREFFECT”

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At least 91 records · Page 5Linked to original sources
PubMed1985

Systematic changes in perceptual reactance induced by physical fitness training.

The effect of life-change events on perceptual augmentation-reduction was studied in 72 subjects (40 men, 32 women). In three experiments the kinesthetic figural aftereffect was measured prior to and after either a physical fitness program, a course in yoga, or training in Transcendental Meditation. Each program lasted a minimum of 8 wk. Subjects completing fitness training, all of whom were initially classified as augmenters, became reducers by the end of their program. Subjects enrolled in yoga and meditation courses remained relatively stable in their perceptual tendencies.

Adolescent↗
PubMed1982

16 PF correlates of perceptual reactance.

College students (n = 24 males, 36 females) volunteered to take the kinesthetic figural aftereffect task and the 16 PF in a survey of state versus trait personality correlates of perceptual reactance. A reliable emergence of the trait component of perceptual reactance over trials was noted. Perceptual reducers were outgoing, affected by feelings, happy-go-lucky, practical, and undisciplined, while augmenters were reserved, stable, sober, imaginative, and controlled. Findings tend to support the trait model of perceptual reactance, with interference from a state component.

Female↗
PubMed1997

Focused attention distorts visual space: an attentional repulsion effect.

Attention was focused at a specific location either by a briefly flashed cue (cue-induced attention) or by a voluntary effort (voluntary attention). In both cases, briefly presented probes appeared displaced away from the focus of attention. The results showed that the effect of cue-induced attention was transient whereas the effect of voluntary attention was long lasting. The repulsion effect was most evident with brief probe durations (< 200 ms). Control experiments ruled out nonattentional hypotheses based on classic figural aftereffects and apparent motion. Although a number of studies have demonstrated enhancements of visual perception at attended locations, the present studies show that focused attention can distort the encoding of nearby positions. Speculation is offered that the repulsion effect is one of the costs involved in the allocation of more resources to the focus of attention.

Attention↗
PubMed1976

Evoked response and kinesthetic measures of augmenting/reducing in schizophrenics: replications and extensions.

This study represents an attempt to replicate the central results of earlier work on stimulus intensity control. It uses a diverse sample of 40 hospitalized schizophrenic subjects, both chronic and acute. Two measures of stimulus intensity control were used: the Petrie kinesthetic figural aftereffects procedure (KFA), and the EEG method of average evoked response (AER). Finding the earlier results generally applicable, it presents a model of the function of stimulus intensity control in schizophrenia, which suggests that acute schizophrenics are particularly vulnerable to being inundated by stimuli, and therefore, that in order to protect themselves, they tend to reduce the perceived intensity of stimuli. Chronic schizophreniics have higher AER amplitudes and reduce less than acutes, suggesting that among chronics, the reducing mechanism either never was present or failed, whereas paranoid schizophrenics tend to be augmenters--a response style consistent with vigilant scanning.

Acute Disease↗
PubMed1977

Perceived exertion and stimulus intensity modulation.

Perceptual augmentation and reduction were considered contrasting styles of Stimulus Intensity Modulation. Differences in perceived exertion between augmenters and reducers were determined for three cycle ergometer work loads. Subjects were 20 males having similar physiological characteristics. Stimulus Intensity Modulation was determined by kinesthetic figural aftereffect. Augmenters rated their perceptions of physical exertion to be more intense than reducers at 450, 750 and 1050 kpm/min. Differences in physiological responses between augmenters and reducers were not significant at the three work loads. Style of Stimulus Intensity Modulation appeared differentially to influence perceived exertion at the work levels studied.

Blood Chemical Analysis↗
PubMed2007

Border-ownership-dependent tilt aftereffect in incomplete figures.

A recent physiological finding of neural coding for border ownership (BO) that defines the direction of a figure with respect to the border has provided a possible basis for figure-ground segregation. To explore the underlying neural mechanisms of BO, we investigated stimulus configurations that activate BO circuitry through psychophysical investigation of the BO-dependent tilt aftereffect (BO-TAE). Specifically, we examined robustness of the border ownership signal by determining whether the BO-TAE is observed when gestalt factors are broken. The results showed significant BO-TAEs even when a global shape was not explicitly given due to the ambiguity of the contour, suggesting a contour-independent mechanism for BO coding.

Algorithms↗