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research:visualsearch [2019/02/08 15:39]
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-===== Visual Search: Strengths and Limitations of Peripheral Vision, or Presence/Absence of Basic Features =====+===== Visual Search: Strengths and Limitations of Peripheral Vision, or Presence/Absence of Basic Features? =====
Intriguingly, search is sometimes difficult even when an observer can clearly distinguish the search target from the other items in the display, known as "distractors".  For example, search for a randomly oriented T among randomly oriented Ls is difficult (Wolfe, Cave, & Franzel, 1989), even though we can easily tell an individual T from an L.  Similarly, search for a target defined by a conjunction of features – such as a white vertical bar among black verticals and white horizontals – is difficult relative to a “feature” search for a horizontal bar among verticals, or for a white bar among black (Treisman & Gelade, 1980; Treisman & Schmidt, 1982).  These phenomena imply that vision is not the same everywhere.  If it were, the easy discriminability of a focal target and distractor pair should lead to easy search. Intriguingly, search is sometimes difficult even when an observer can clearly distinguish the search target from the other items in the display, known as "distractors".  For example, search for a randomly oriented T among randomly oriented Ls is difficult (Wolfe, Cave, & Franzel, 1989), even though we can easily tell an individual T from an L.  Similarly, search for a target defined by a conjunction of features – such as a white vertical bar among black verticals and white horizontals – is difficult relative to a “feature” search for a horizontal bar among verticals, or for a white bar among black (Treisman & Gelade, 1980; Treisman & Schmidt, 1982).  These phenomena imply that vision is not the same everywhere.  If it were, the easy discriminability of a focal target and distractor pair should lead to easy search.
 
research/visualsearch.1549658382.txt.gz · Last modified: 2019/02/08 15:39 by rosenholtz