A Unique Role of Endogenous Visual-Spatial Attention in Rapid Processing of Multiple Targets
Por:
Guzman-Martinez E., Grabowecky M., Palafox G., Suzuki S.
Publicada:
1 ago 2011
Resumen:
Visual spatial attention can be exogenously captured by a salient stimulus or can be endogenously allocated by voluntary effort. Whether these two attention modes serve distinctive functions is debated, but for processing of single targets the literature suggests superiority of exogenous attention (it is faster acting and serves more functions). We report that endogenous attention uniquely contributes to processing of multiple targets. For speeded visual discrimination, response times are faster for multiple redundant targets than for single targets because of probability summation and/or signal integration. This redundancy gain was unaffected when attention was exogenously diverted from the targets but was completely eliminated when attention was endogenously diverted. This was not a result of weaker manipulation of exogenous attention because our exogenous and endogenous cues similarly affected overall response times. Thus, whereas exogenous attention is superior for processing singl
Filiaciones:
Guzman-Martinez E.:
Department of Psychology, Northwestern University, United States
Grabowecky M.:
Department of Psychology and Interdepartmental Neuroscience Program, Northwestern University, United States
Palafox G.:
Univ Nacl Autonoma Mexico, Dept Psychol, Mexico City 04510, DF, Mexico
Suzuki S.:
Department of Psychology and Interdepartmental Neuroscience Program, Northwestern University, United States
|