Effects of hand proximity and movement direction in spatial and temporal gap discrimination

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Previous research on the interplay between static manual postures and<br />visual attention revealed enhanced visual selection near the hands<br />(near-hand effect). During active movements there is also superior<br />visual performance when moving toward compared to away from the stimulus<br />(direction effect). The ``modulated visual pathways{''} hypothesis<br />argues that differential involvement of magno- and parvocellular visual<br />processing streams causes the near-hand effect. The key finding<br />supporting this hypothesis is an increase in temporal and a reduction in<br />spatial processing in near-hand space (Gozli et al., 2012). Since this<br />hypothesis has, so far, only been tested with static hand postures, we<br />provide a conceptual replication of Gozli et al.'s (2012) result with<br />moving hands, thus also probing the generality of the direction effect.<br />Participants performed temporal or spatial gap discriminations while<br />their right hand was moving below the display. In contrast to Gozli et<br />al (2012), temporal gap discrimination was superior at intermediate and<br />not near hand proximity. In spatial gap discrimination, a direction<br />effect without hand proximity effect suggests that pragmatic attentional<br />maps overshadowed temporal/spatial processing biases for far/near-hand<br />space.




Wiemers, M., & Fischer, M. H. (2016). Effects of hand proximity and movement direction in spatial and temporal gap discrimination. Frontiers in Psychology, 7(DEC). https://doi.org/10.3389/fpsyg.2016.01930

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