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Comparing attention and eye movements towards real objects versus image displays
AuthorSkiba, Rafal Marcin
AdvisorSnow, Jacqueline C.
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Images of objects are commonly used as proxies of real objects in studies testing attention and eye movements. However, a lot of modern research discovered neural and behavioral differences in perception of real objects and their pictorial representations. The goal of the current investigation is to verify if covert attentional orienting and patterns eye movements are influenced by proprieties of real objects such as stereoscopic cues and tangibility. In the first experiment a modified version of the Posner cueing task was used to verify differences in spatial orienting between real tools and fruits and vegetables and their pictorial representations. The result showed that participants were faster to detect a target on the left side of real objects rather than when displayed as images, however, only if real objects were presented in a reachable distance. Therefore, the first study showed that the graspability of stimulus magnifies the leftward bias of visuospatial attention also known as ‘pseudoneglect’. The second study compared patterns of eye movements in categorization and grasping task of real familiar tools and their images and stereoscopic displays. The results showed that if participants were asked to categorize objects then the display format of those items did not affect patterns of eye movements. However, when the participants were asked to grasp the objects then their eye movements were more focused on the handles of real objects rather than any other display format. Therefore, the both experiments showed the importance of tangibility of stimuli on perception. Moreover, the two studies used novel stimuli presentation systems that can be used in the future research studies testing other aspects of perception of real objects and their pictorial representations.