Humans perceive a line touching an edge of a large rectangle longer than the reality. has suggested that this illusion occurs because we perceive that the line is partly “hidden” behind the rectangle and automatically completes it. We tested whether bantams ( ) would experience this perceptual phenomenon using a line classification task on the touch monitor, which was used in our previous study with rhesus monkeys and pigeons ( ). We trained three bantams to classify six lengths of black target lines into two categories, “short” or “long,” ignoring a gray rectangle (Experiment 1) or a gray area (i.e., a left or a right half of the monitor was filled with gray; Experiment 2) located at the same distance (8 pixels) from the target line. In the test, the gap between the line and the gray rectangle (or area) sometimes changed (0, 4, or 8 pixels; we labeled these stimuli as G , G , and G respectively). Both of the two successfully trained bantams showed an illusion for G , but the direction of illusion was reversed; that is, they judged the line in G to be “shorter” than that in G and G . Further analyses proved that neither the gaps between the target line and the gray rectangle nor the total widths of the stimuli could account for the bantams' responses. These results suggest that bantams do not complete the “occluded” portion even when identification of its shape is not required.
Do Bantams ( ) Amodally Complete Partly Occluded Lines? An Analysis of Line Classification Performance
Abstract
Humans perceive a line touching an edge of a large rectangle longer than the reality. has suggested that this illusion occurs because we perceive that the line is partly “hidden” behind the rectangle and automatically completes it. We tested whether bantams ( ) would experience this perceptual phenomenon using a line classification task on the touch monitor, which was used in our previous study with rhesus monkeys and pigeons ( ). We trained three bantams to classify six lengths of black target lines into two categories, “short” or “long,” ignoring a gray rectangle (Experiment 1) or a gray area (i.e., a left or a right half of the monitor was filled with gray; Experiment 2) located at the same distance (8 pixels) from the target line. In the test, the gap between the line and the gray rectangle (or area) sometimes changed (0, 4, or 8 pixels; we labeled these stimuli as G , G , and G respectively). Both of the two successfully trained bantams showed an illusion for G , but the direction of illusion was reversed; that is, they judged the line in G to be “shorter” than that in G and G . Further analyses proved that neither the gaps between the target line and the gray rectangle nor the total widths of the stimuli could account for the bantams' responses. These results suggest that bantams do not complete the “occluded” portion even when identification of its shape is not required.Preview Only. This article cannot be rented because we do not currently have permission from the publisher.
/lp/psycarticles-reg/do-bantams-amodally-complete-partly-occluded-lines-an-analysis-of-line-KFdL2XUtjG
Welcome to DeepDyve! Rent Premier Research Articles and Save Up to 90%
Preview Only
Do Bantams ( ) Amodally Complete Partly Occluded Lines? An Analysis of Line Classification Performance
Nakamura, Noriyuki; Watanabe, Sota; Betsuyaku, Toru; Fujita, Kazuo
Follow Journal of Comparative Psychology
, Volume 125 (4): 411
PsycARTICLES® – Nov 1, 2011
More Info
More Like This Article
View All dataSource[]=actageo&dataSource[]=aspet&dataSource[]=aaos&dataSource[]=aacc&dataSource[]=aacr&dataSource[]=aea&dataSource[]=aip&dataSource[]=ajnr&dataSource[]=ams&dataSource[]=aps_physical&dataSource[]=appi_book&dataSource[]=appi_journal&dataSource[]=apha&dataSource[]=asip&dataSource[]=asm&dataSource[]=asn&dataSource[]=aspb&dataSource[]=avs&dataSource[]=annual_reviews&dataSource[]=arxiv&dataSource[]=acm&dataSource[]=berghahn&dataSource[]=cabi&dataSource[]=clinical_trials&dataSource[]=dailymed&dataSource[]=degruyter&dataSource[]=du_press&dataSource[]=esa&dataSource[]=eu_press&dataSource[]=elsevier&dataSource[]=emerald&dataSource[]=ejtr&dataSource[]=emea&dataSource[]=epo&dataSource[]=faseb&dataSource[]=gsa&dataSource[]=health_affairs&dataSource[]=hindawi&dataSource[]=imanager&dataSource[]=imedpub&dataSource[]=informa_healthcare&dataSource[]=informs&dataSource[]=iop&dataSource[]=iucr&dataSource[]=iospress&dataSource[]=jbjs&dataSource[]=leftcoast&dataSource[]=lu_press&dataSource[]=mesharpe&dataSource[]=mary_ann_liebert&dataSource[]=medline&dataSource[]=mit_press&dataSource[]=nature&dataSource[]=oxford&dataSource[]=pier_professional&dataSource[]=pnas&dataSource[]=portlandpress&dataSource[]=psyc_articles&dataSource[]=psyc_books&dataSource[]=psyc_critiques&dataSource[]=plos_journal&dataSource[]=pubmed_central&dataSource[]=rsna&dataSource[]=rockefeller&dataSource[]=rcn&dataSource[]=ria&dataSource[]=rsc&dataSource[]=sage&dataSource[]=spie&dataSource[]=springer_journal&dataSource[]=springer&dataSource[]=taylor_francis&dataSource[]=aps&dataSource[]=the_scientist&dataSource[]=uc_press&dataSource[]=uspto_abstract&dataSource[]=wiley&dataSource[]=pct
© 2012 DeepDyve, Inc. All rights reserved.
Terms of Service | Privacy Policy
