Neuronale Korrelate der Konturintegration

Three studies are presented:-B Mathes, D Trenner, M Fahle (2006). The electrophysiological correlate of contour integration is modulated by task demands, Brain Research, 1114, 98-112It is shown that contour integration elicits a negative shift over posterior recording sites. This effect started about 150 ms after stimulus onset but was delayed for more difficult contour integration. Difficult contour integration may in addition elicit a frontal selection positivity. The result indicate that contours are processed similar to textures and that decreasing saliency of detectable contours is compensated by increasing processing time which possibly results from increasing allocation of visual selective attention.-B Mathes, M Fahle (2007). The electrophysiological correlate of contour integration is similar for colour and luminance mechanisms, Psychophysiology ,in pressTo investigate how contour integration depends on early sensory processing, the electrophysiological correlate of contour integration of elements defined by luminance or isoluminant colour contrasts was measured. Detectable contours elicit a negative shift over posterior recording sites which is similar for luminance and colour contrasts. This indicates a common physiological processing stream for contour integration of red-and-green and black-and-white elements.-B Mathes, M Fahle (2007). Closure facilitates contour integration in smooth and short contours, Vision Research, in pressThe facilitation of contour integration by closure has been questioned. Our results demonstrate that closure improves contour integration, even when shortcomings of earlier studies are controlled for. However, the advantage of closure might be minor.