In natural environments, visual scenes are generically dynamic - however, most experimental work on this topic uses static stimuli for investigating feature integration. We are bridging this gap by studying contour integration in dynamic scenes under extended viewing conditions. Surprisingly, it turns out that contours are extremely difficult to perceive in these situations, challenging the notion of contour integration being a stimulus-driven, fast, feed-forward process. Our goal is to understand the origins of the differences between feature integration in static and dynamic contexts, and to disentangle the roles of neural dynamics (adaptation and noise), task configuration (cueing, selective attention) and cognitive factors (fatigue, expectations).
Have a look at typical stimuli presented in the experiment by downloading the following movies: Red arrows were added to indicate where a contour forms at the end of the trial, however, these arrows were not present in the real experiment. The contour always appears at the end of a trial, but it is extremely hard to perceive in an extended presentation while it 'pops out' easily in a short presentation (if you have difficulties in perceiving the contour, try the extended presentation with markers or the short presentation with markers).