scholarly journals Illusion decrement in wings-in and wings-out Müller-Lyer figures

1991 ◽  
Vol 29 (2) ◽  
pp. 139-142 ◽  
Author(s):  
Maria Watson ◽  
Suzanne Greist-Bousquet ◽  
H. R. Schiffman
Keyword(s):  
Illusion Decrement

Visual-Geometric Illusions: Unisex Phenomena

Perception ◽  
1979 ◽  
Vol 8 (4) ◽  
pp. 401-412 ◽  
Author(s):  
Clare Porac ◽  
Stanley Coren ◽  
Joan S Girgus ◽  
Mickey Verde
Keyword(s):  
Sex Differences ◽  
Illusion Magnitude ◽  
Male And Female ◽  
Illusion Decrement

The possibility of sex differences in responses to visual-geometric illusions was investigated with the use of forty-five illusion variants and a sample of 221 observers. No difference in illusion magnitude as a function of sex was found. A second experiment measured illusion decrement and transfer of decrement to other illusion configurations. Again there were no significant differences between male and female observers.

Decrement and the Illusions of the Mueller-Lyer Figure

1994 ◽  
Vol 79 (2) ◽  
pp. 707-717 ◽  
Author(s):  
Clare Porac
Keyword(s):  
Perceptual Learning ◽  
Illusion Magnitude ◽  
Group Level ◽  
Illusion Decrement ◽  
Significant Time ◽  
Lyer Illusion ◽  
Significant Decrement ◽  
Level Data

Decrement, a time-related decrease in the magnitude of the Mueller-Lyer illusion, was measured separately for the wings-out and the wings-in variants of the Mueller-Lyer figure. There were significant reductions of wings-out illusion magnitude during the decrement period. Observers viewing the wings-in segment showed a non-significant decrement pattern. Analyses of individual decrement patterns showed that illusion magnitude did not decrease for a number of observers even when there were significant time-related trends at the group level. Data for 80 observers imply that the mechanisms of perceptual learning proposed by previous models of Mueller-Lyer illusion decrement are not sufficient explanations of the decrement process.

scholarly journals The assessment of motor control in sighting dominance using an illusion decrement procedure

1977 ◽  
Vol 21 (4) ◽  
pp. 341-346 ◽  
Author(s):  
Clare Porac ◽  
Stanley Coren
Keyword(s):  
Motor Control ◽  
Illusion Decrement

Decrement of the Brentano Müller-Lyer Illusion as a Function of Inspection Time

Perception ◽  
1998 ◽  
Vol 27 (2) ◽  
pp. 183-192 ◽  
Author(s):  
John Predebon
Keyword(s):  
Visual Inspection ◽  
Illusion Magnitude ◽  
Inspection Time ◽  
Inspection Period ◽  
Illusion Figure ◽  
Illusion Decrement ◽  
Lyer Illusion ◽  
Time Period ◽  
Post Test ◽  
Time Periods

Two experiments are reported in which the decline or decrement in the magnitude of the Brentano Müller-Lyer illusion was measured. Observers made a pre-test judgment and, after a variable intervening time period, a post-test judgment of illusion magnitude. In experiment 1, the intervening time periods were 1, 2, and 3 min during which time the independent groups of observers allocated to each of the three time periods either systematically scanned the Brentano figure (inspection conditions) or waited until the intervening period had elapsed (no-inspection conditions). Experiment 2, which included an additional 5 min intervening time period, evaluated a response-bias explanation for the results of the inspection conditions of experiment 1. Taken together, the findings of the two experiments indicate that sheer inspection of the Brentano figure produces illusion decrement. However, illusion decrement was independent of the duration of the inspection period, with equivalent amounts of decrement occurring across the range of viewing times examined in the two experiments. The pattern of these results suggests that theories of Müller-Lyer decrement must incorporate a factor attributable to, or correlated with, inspection time, whose effect in reducing illusion magnitude is confined mainly to the first 1 or 2 min of active visual inspection of the Brentano illusion figure.

scholarly journals Illusion decrement in intersecting line figures

1972 ◽  
Vol 26 (2) ◽  
pp. 108-110 ◽  
Author(s):  
Stanley Coren ◽  
Joan S. Girgus
Keyword(s):  
Illusion Decrement

The Horizontal Vertical Illusion: Evidence for Strategic Factors in Feedback-Induced Illusion Decrement

1996 ◽  
Vol 82 (1) ◽  
pp. 79-87 ◽  
Author(s):  
Katherine M. Harris ◽  
Burton M. Slotnick
Keyword(s):  
Visual Processing ◽  
Structural Changes ◽  
Line Length ◽  
Cognitive Change ◽  
Medium Size ◽  
Horizontal Line ◽  
Production Task ◽  
Line Production ◽  
Illusion Decrement ◽  
Before And After

This study assessed whether feedback would improve performance on a horizontal vertical illusion task and whether such improvement would transfer to different forms of the illusion. Subjects shortened the extended vertical line of small, medium, and large inverted-T figures to be equal in length to the horizontal line before and after being shown a correctly adjusted medium-sized figure (visual feedback). Next, they were tested on three alternate forms of the illusion; a production task (drawing 1-in. lines in the horizontal and vertical planes), an adjustment task using L figures, and a task requiring them to choose which of several sailboat drawings had mast height equal to hull length. Prior to feedback, vertical lines were adjusted shorter than the horizontal lines on each size inverted-T figure. After feedback on the medium-size figure, experimental subjects were more accurate than the controls on each size inverted-T figure. The results suggest that transfer of illusion decrement was also obtained for the boat-selection and, to a lesser extent, the L-figure adjustment tasks but not to the line-production task. These findings are consistent with the notion that improvement after feedback is not due to structural changes in visual processing or to simple feedback-induced compensation in performance but involves some strategic or cognitive change in judging line length.

scholarly journals Is adaptation of orientation-specific cortical cells a plausible explanation of illusion decrement?

1986 ◽  
Vol 24 (3) ◽  
pp. 207-210 ◽  
Author(s):  
Stanley Coren ◽  
Joan S. Girgus ◽  
Diane Schiano
Keyword(s):  
Cortical Cells ◽  
Illusion Decrement

Illusion Decrement as a Function of Duration of Inspection and Figure Type

1997 ◽  
Vol 84 (3) ◽  
pp. 779-783 ◽  
Author(s):  
Gary M. Brosvic ◽  
Marcia A. Walker ◽  
Natalie Perry ◽  
Sherrie Degnan ◽  
Roberta E. Dihoff
Keyword(s):  
Perceptual Learning ◽  
Visual Inspection ◽  
Intertrial Interval ◽  
Standard Line ◽  
Learning Mechanisms ◽  
Illusion Decrement ◽  
Figure Type

Illusion decrement for the Müller-Lyer and Horizontal-Vertical illusions was examined. The experiment consisted of an initial adjustment of an illusion followed by 20 test trials, each with an intervening 60-sec. intertrial interval during which a comparator line and a standard line set to equality were visually inspected for 0, 20, 40, or 60 sec. After each intertrial interval the length of the comparator line was reset by the experimenter to either 0 or 90 cm, and subjects then adjusted its length to perceived equality with the standard line (42 cm). Illusion decrement was inversely related to the duration of inspection for each illusion, with significant reductions in magnitude of illusion observed for all groups. These results support prior demonstrations that perceptual learning mechanisms are operative during brief periods of visual inspection, especially when these periods are followed by the opportunity to make repeated adjustments.

scholarly journals Is visual illusion decrement based on selective adaptation?

1989 ◽  
Vol 46 (3) ◽  
pp. 279-283 ◽  
Author(s):  
Clare Porac
Keyword(s):  
Visual Illusion ◽  
Selective Adaptation ◽  
Illusion Decrement
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