Document Detail

The global slowdown effect: Why does perceptual grouping reduce perceived speed?
MedLine Citation:
PMID:  24448695     Owner:  NLM     Status:  Publisher    
The percept of four rotating dot pairs is bistable. The "local percept" is of four pairs of dots rotating independently. The "global percept" is of two large squares translating over one another (Anstis & Kim 2011). We have previously demonstrated (Kohler, Caplovitz, & Tse 2009) that the global percept appears to move more slowly than the local percept. Here, we investigate and rule out several hypotheses for why this may be the case. First, we demonstrate that the global slowdown effect does not occur because the global percept is of larger objects than the local percept. Second, we show that the global slowdown effect is not related to rotation-specific detectors that may be more active in the local than in the global percept. Third, we find that the effect is also not due to a reduction of image elements during grouping and can occur with a stimulus very different from the one used previously. This suggests that the effect may reflect a general property of perceptual grouping. Having ruled out these possibilities, we suggest that the global slowdown effect may arise from emergent motion signals that are generated by the moving dots, which are interpreted as the ends of "barbell bars" in the local percept or the corners of the illusory squares in the global percept. Alternatively, the effect could be the result of noisy sources of motion information that arise from perceptual grouping that, in turn, increase the influence of Bayesian priors toward slow motion (Weiss, Simoncelli, & Adelson 2002).
Peter Jes Kohler; Gideon Paul Caplovitz; Peter Ulric Tse
Related Documents :
2803115 - Auditory brainstem evoked potentials peak identification by finite impulse response dig...
2676945 - Effect of phase shifts in pressure-flow relationship on response to inspiratory resista...
10206515 - Optimal band pass filtering of transient evoked otoacoustic emissions in neonates.
25026385 - Lighting and the office environment: a review.
14972905 - Influence of male and female cones on assimilate production of pinus contorta trees wit...
19458145 - Dim-light sensitivity of cells in the awake cat's lateral geniculate and medial interla...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-1-22
Journal Detail:
Title:  Attention, perception & psychophysics     Volume:  -     ISSN:  1943-393X     ISO Abbreviation:  Atten Percept Psychophys     Publication Date:  2014 Jan 
Date Detail:
Created Date:  2014-1-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101495384     Medline TA:  Atten Percept Psychophys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Gas diffusion as a new fluidic unit operation for centrifugal microfluidic platforms.
Next Document:  An objective measure of auditory stream segregation based on molecular psychophysics.