Abstract：
:Three experiments, and a replication of each, investigated the nonconscious prerecognition visual processing given left visual field (LVF) and right visual field (RVF) letter inputs. Each input was a vertically arrayed pair of letters in which three variables were manipulated: (1) the same letter twice vs one each of two letters, (2) same vs 180 degree difference in orientations within each letter pair, and (3) normal vs mirror-image letter form. The procedure presented all pairs of letter combinations in pairs of pre- and postmasked 10-msec flashes; the subject's task was to report which flash of each pair appeared to last longer. When letter pairs differed on all three variables, RVF presentations of mirror-image letters were judged to be longer than equal presentations of normal letters; the reverse occurred for LVF presentations. When one normal and mirror-image letter were presented, RVF presentations of mismatched orientations were judged to be longer than matched orientations, and the reverse was true for LVF presentations. When pairs of two normal letters were presented, no processing difference between LVF and RVF presentations was observed. A fourth experiment tested presence/absence detection of the letter pairs under the input conditions of the main experiments and showed those conditions to produce chance-level presence/absence detection. These results suggest that each hemisphere can perform its own prerecognition operations and that neither hemisphere is necessarily specialized for any particular prerecognition visual operation.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Avant LL,Thieman AA,Miller GWdoi
10.1016/0028-3932(93)90138-psubject
Has Abstractpub_date
1993-07-01 00:00:00pages
661-73issue
7eissn
0028-3932issn
1873-3514journal_volume
31pub_type
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