Left visual-field advantage for detecting learned targets in rapid serial visual presentation A Karas, C Kaernbach |
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Institut für Psychologie, Christian-Albrechts-Universität zu Kiel, Germany
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| Rapid serial visual presentation (RSVP) has often been used to study conscious and unconscious processing of fast visual input. Dual-target paradigms with a first (T1) and a second (T2) target model the ecologically valid situation that we are searching the visual world for more than one type of relevant targets. In dual-stream studies it has been found that T2 in the left visual field have a much better chance to be consciously perceived. This left visual-field advantage (LVFA) seems to be due to an advantage of the right hemisphere to direct attention to relevant external stimuli. Studies of the LVFA have to be careful about the stimuli as there are hemispheric asymmetries concerning the processing of certain stimulus types (letters, digits, faces). In previous studies the targets were selected from a different set of stimuli than the distractors in order to make them pop out from the distractor stream. This complicates interpretation of the found asymmetries. The present study presents for the first time a LVFA for targets that were taken from the same stimulus set as the distractors and that differed from the distractor set only by instruction and training. |
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