Main content

Home

Menu

Loading wiki pages...

View
Wiki Version:
**Introduction** In a neurophysiological study, Wannig et al. (2011) measured neuronal activity in primary visual cortex (area V1) of macaque monkeys and found evidence for an automatic spread of attention to objects beyond an attended stimulus when these objects were grouped with the attended stimulus by Gestalt criteria. In particular, they reported an increase in the activity of neurons whose receptive field contained stimuli that were grouped with a saccade target by one or several gestalt criteria (collinearity, similarity, their combination, or common fate). The goal of our study is to show whether this allocation of attention can be observed in humans, at a behavioral level. In our first experiment (https://osf.io/c9zb3/) we used color as a grouping feature and tested allocation of attention towards saccade target and other stimuli (that were grouped and not grouped with this target). The saccade target was cued 500 ms before a go signal (the disappearance of the cue) to execute the eye movement (delayed saccade task). We measured attention directly by assessing performance in an orientation discrimination task. Participants were instructed to execute saccades towards the stimulus (one of four vertically oriented Gabor gratings). At one of the three time points before the saccade onset one of the gratings changed the orientation for 25 ms. Participants reported the direction of orientation change after the eye movement was finished. We expected that the best performance would be at the saccade target location (Kowler et al., 1995; Deubel & Schneider, 1996; Deubel, 2008; Rolfs et al., 2011). Indeed this effect was prominent. However, the time course of attentional allocation did not meet our expectations: The best performance was for the probe 300 ms after the movement cue appearance and decreased closer to saccade onset (600 ms after cue onset, i.e., 100 ms after the go signal). These dynamics of attentional allocation might be explained by the delayed task, as a salient visual event (the disappearance of the cue occurred closer in time to the probe presented 600 ms after the movement cue. Our main interest was the performance at the locations grouped by the same color with saccade target, as the increase of performance at these locations would be the evidence for the allocation of attention towards the irrelevant stimuli grouped by the gestalt criteria. We did not find a significant effect of grouping in these locations. Whether the absence of significant result might be explained by the weak grouping still remains an open question. The aim of this follow-up experiment is to determine if stronger grouping combined with an immediate saccade task will lead to a spread of attention to objects grouped with the saccade target that can be measured in the behavioral task.
OSF does not support the use of Internet Explorer. For optimal performance, please switch to another browser.
Accept
This website relies on cookies to help provide a better user experience. By clicking Accept or continuing to use the site, you agree. For more information, see our Privacy Policy and information on cookie use.
Accept
×

Start managing your projects on the OSF today.

Free and easy to use, the Open Science Framework supports the entire research lifecycle: planning, execution, reporting, archiving, and discovery.