The influence of cast shadows on visual search Export

@article{citeulike:1230231, abstract = {We show that cast shadows can have a significant influence on the speed of visual search. In particular, we find that search based on the shape of a region is affected when the region is darker than the background and corresponds to a shadow formed by lighting from above. Results support the proposal that an early-level system rapidly identifies regions as shadows and then discounts them, making their shapes more difficult to access. Several constraints used by this system are mapped out, including constraints on the luminance and texture of the shadow region, and on the nature of the item casting the shadow. Among other things, this system is found to distinguish between line elements (items containing only edges) and surface elements (items containing visible surfaces), with only the latter deemed capable of casting a shadow.}, address = {Department of Psychology, 2136 West Mall, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. rensink@psych.ubc.ca}, author = {Rensink, R. A. and Cavanagh, P.}, citeulike-article-id = {1230231}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/15693675}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=15693675}, citeulike-linkout-2 = {http://www.perceptionweb.com/perception/fulltext/p33/p5322.pdf}, issn = {0301-0066}, journal = {Perception}, keywords = {perception, shadows, vision}, number = {11}, pages = {1339--1358}, posted-at = {2007-04-16 18:48:15}, priority = {5}, title = {The influence of cast shadows on visual search}, url = {http://view.ncbi.nlm.nih.gov/pubmed/15693675}, volume = {33}, year = {2004} }

TY - JOUR ID - citeulike:1230231 L3 - citeulike-article-id:1230231 N2 - We show that cast shadows can have a significant influence on the speed of visual search. In particular, we find that search based on the shape of a region is affected when the region is darker than the background and corresponds to a shadow formed by lighting from above. Results support the proposal that an early-level system rapidly identifies regions as shadows and then discounts them, making their shapes more difficult to access. Several constraints used by this system are mapped out, including constraints on the luminance and texture of the shadow region, and on the nature of the item casting the shadow. Among other things, this system is found to distinguish between line elements (items containing only edges) and surface elements (items containing visible surfaces), with only the latter deemed capable of casting a shadow. IS - 11 JF - Perception SN - 0301-0066 AD - Department of Psychology, 2136 West Mall, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. rensink@psych.ubc.ca EP - 1358 TI - The influence of cast shadows on visual search VL - 33 SP - 1339 KW - perception KW - shadows KW - vision AU - Rensink, RA AU - Cavanagh, P PY - 2004/// UR - http://view.ncbi.nlm.nih.gov/pubmed/15693675 ER -