RT Journal Article
A1 Persike, Malte
A1 Meinhardt, Günter
T1 The contribution of colour and spatial frequency cues to contour integration
JF Journal of Vision
JO Journal of Vision
YR 2011
DO 10.1167/11.11.1051
VO 11
IS 11
SP 1051
OP 1051
SN 1534-7362
AB Cue combination of orientation collinearity with additional colour or spatial frequency cues was studied within the pathfinder paradigm. Human subjects had to detect target contours, embedded in cluttered backgrounds, and identify their shape. Single cue targets were defined by either orientation collinearity of contour elements, feature contrast in colour, or in spatial frequency. Double cue contours were combinations of element collinearity with one of the feature contrast cues. Cue summation, conceived as the saliency gain due to multiple cues, was measured in a 2AFC task and tested against predictions derived from probability summation and linear summation. Cue summation with spatial frequency contrast significantly exceeded the independence prediction and also surpassed linear summation in a number of conditions. Cue summation with colour contrast, however, only scarcely exceeded probability summation and always fell below linear summation. For both the colour and spatial frequency cue, identification performance benefitted more from cue combination than detection. Results thus suggest distinct saliency inducing mechanisms in contour integration, one that subserves object detection, the other mediates form completion and shape identification.
RD 3/3/2021
UL https://doi.org/10.1167/11.11.1051