Context effects on texture border localization bias.
Observers are able to locate precisely a border defined by changes in texture orientation. The prevailing theory is that such localization takes place using a hierarchical, filter-rectify-filter mechanism. An alternative theory is that contextual modulation causes the border elements to stand out. Here we show that perceived border location is inconsistent with contextual modulation from iso-oriented elements. The perceived location of a vertical border defined by vertical texture on one side, and horizontal texture on the other side, is biased towards the vertical texture. We found the same bias in a single row of texture. Therefore, the bias is not due to contextual influences from surrounding iso-oriented elements. Contextual influences between cross-oriented elements can explain the data.
Popple
Ariella V
AV
Optometry, Minor Hall, University of California, Berkeley, CA 94720-2020, USA. apopple@spectacle.berkeley.edu
D005364:Field Dependence-Independence; D006801:Humans; D008959:Models, Neurological; D008960:Models, Psychological; D009949:Orientation; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D014793:Visual Cortex / Q000502:physiology