Abstract：
:We have measured orientation discrimination in the presence of a variable number of neutral distracters for two distinct tasks: identification of the orientation of a tilted target and location of its position. Both tasks were performed in the presence of visual noise of variable contrasts. Under a range of conditions, subjects could identify the direction of target tilt at thresholds well below those necessary to locate its position. The location thresholds showed only weak dependency on set-size, consistent with a stimulus uncertainty of parallel search of the output of independent orientation analysers, while the identification thresholds showed a much stronger dependency, varying with the square root of set-size over a wide range noise contrasts. The square root relationship suggests perceptual summation of target and distracters. Manipulating the spread of visual noise suggests that the summation is feature-based, possibly operating on the outputs of first-stage orientation analysers. Pre-cueing the target eliminates the effects of set-size, showing that the summation is under rapid attentional control; the visual system can choose between high performance over a limited area and poorer performance over a much larger area.
journal_name
Vision Resjournal_title
Vision researchauthors
Baldassi S,Burr DCdoi
10.1016/s0042-6989(00)00029-8subject
Has Abstractpub_date
2000-01-01 00:00:00pages
1293-300issue
10-12eissn
0042-6989issn
1878-5646pii
S0042-6989(00)00029-8journal_volume
40pub_type
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