Perceived Positions Determine Crowding
Author Information
Author(s): Maus Gerrit W., Fischer Jason, Whitney David
Primary Institution: Department of Psychology, University of California, Berkeley, California, United States of America
Hypothesis
Does retinal or perceived position determine the magnitude of crowding?
Conclusion
The study concludes that crowding is determined by the perceived position of objects rather than their retinal position.
Supporting Evidence
- Crowding was stronger for distractors drifting towards the target and weaker for distractors drifting away from the target.
- The mean size of the illusory position shift across all five participants was 0.34 degrees.
- Faster drift speeds led to larger shifts in the perceived positions of drifting gratings.
- Eliminating the illusory position shifts also eliminated the dependence of crowding on motion direction.
Takeaway
When we look at things, sometimes we can't tell them apart if they're too close together. This study found that how we see their positions, not just where they are on our eyes, affects how well we can recognize them.
Methodology
Participants performed orientation discrimination tasks with Gabor patches while the positions of distractors were manipulated.
Potential Biases
Potential biases may arise from the participants being experienced psychophysical observers, which could influence their performance.
Limitations
The study involved a small number of participants and specific visual stimuli, which may limit the generalizability of the findings.
Participant Demographics
Eight volunteers (four females and four males, age 20 to 29 years) participated in the experiments.
Statistical Information
P-Value
0.002
Confidence Interval
95%-confidence intervals were estimated with a parametric bootstrap procedure.
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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