THE EFFECT OF LIGHTNESS CONTRAST, TACHISTOSCOPIC DURATION AND FUNDUS PIGMENTATION ON THE MAGNITUDE OF THE MUELLER-LYER ILLUSION

1973 ◽  
Vol 50 (11) ◽  
pp. 872-879 ◽  
Author(s):  
Pamela C. Ebert ◽  
Robert H. Pollack
Keyword(s):  
Lyer Illusion ◽  
Lightness Contrast ◽  
Fundus Pigmentation

Some Factors Affecting Magnitude of the Mueller-Lyer Illusion

1973 ◽  
Vol 37 (2) ◽  
pp. 433-434 ◽  
Author(s):  
Pamela C. Ebert ◽  
Robert H. Pollack
Keyword(s):  
Critical Factors ◽  
Factors Affecting ◽  
Gradual Rise ◽  
Lyer Illusion ◽  
Lightness Contrast ◽  
Minimal Contrast ◽  
Fundus Pigmentation

Lightness contrast, tachistoscopic duration, and fundus pigmentation have been found to be critical factors determining the magnitude of the Mueller-Lyer illusion. Figures produced by marked lightness contrast evidence a gradual rise in illusion size with prolonged viewing, while the reverse is true for a figure produced by minimal contrast.

scholarly journals The effect of lightness contrast on the colored Müller-Lyer illusion

1991 ◽  
Vol 50 (3) ◽  
pp. 225-229 ◽  
Author(s):  
Robert H. Pollack ◽  
Theodore B. Jaeger
Keyword(s):  
Lyer Illusion ◽  
Lightness Contrast

Effects of Lightness Contrast and Fundus Pigmentation on Age-Related Decrement in Magnitude of the Mueller-Lyer Illusion

1976 ◽  
Vol 42 (3_suppl) ◽  
pp. 1276-1278 ◽  
Author(s):  
Pam Ebert
Keyword(s):  
College Students ◽  
Elementary School ◽  
School Children ◽  
Contrast Effect ◽  
Elementary School Children ◽  
Bimodal Distribution ◽  
Lightness Contrast ◽  
Age Related ◽  
Fundus Pigmentation ◽  
White College

Components of the Mueller-Lyer figure, representing two levels of lightness contrast (1.5 black/ and 7.5 light grey/ each on 9.5 white/ ground) were viewed tachistoscopically for 500 msec. by 65 white elementary school children and 50 white college students. The contrast effect was significant, with black figures yielding a greater illusion than the light grey figures at all age levels. Further, a bimodal distribution of fundus density was evident in both age categories, with more densely pigmented Ss yielding smaller illusions.

scholarly journals Magnitude of the Mueller-Lyer illusion as a function of hue, saturation, and fundus pigmentation

1972 ◽  
Vol 26 (4) ◽  
pp. 225-226 ◽  
Author(s):  
Pamela C. Ebert ◽  
Robert H. Pollack
Keyword(s):  
Lyer Illusion ◽  
Fundus Pigmentation

People Are Less Susceptible to Illusion When They Use Their Hands to Communicate Rather Than Estimate

2021 ◽  
pp. 095679762199155
Author(s):  
Amanda R. Brown ◽  
Wim Pouw ◽  
Diane Brentari ◽  
Susan Goldin-Meadow
Keyword(s):  
American Sign Language ◽  
Sign Language ◽  
English Speakers ◽  
American Sign ◽  
Estimation Task ◽  
Sign Languages ◽  
Lyer Illusion ◽  
Description Task ◽  
The Way

When we use our hands to estimate the length of a stick in the Müller-Lyer illusion, we are highly susceptible to the illusion. But when we prepare to act on sticks under the same conditions, we are significantly less susceptible. Here, we asked whether people are susceptible to illusion when they use their hands not to act on objects but to describe them in spontaneous co-speech gestures or conventional sign languages of the deaf. Thirty-two English speakers and 13 American Sign Language signers used their hands to act on, estimate the length of, and describe sticks eliciting the Müller-Lyer illusion. For both gesture and sign, the magnitude of illusion in the description task was smaller than the magnitude of illusion in the estimation task and not different from the magnitude of illusion in the action task. The mechanisms responsible for producing gesture in speech and sign thus appear to operate not on percepts involved in estimation but on percepts derived from the way we act on objects.

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