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Katsuaki Sakata, Hitomi Shimakura, Toshifumi Mihashi; The role of cortical chromatic mechanisms in visual search. Journal of Vision 2010;10(15):45. doi: 10.1167/10.15.45.
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© ARVO (1962-2015); The Authors (2016-present)
Some studies have reported that the information from the magnocellular pathway is important in serial searches, in which subjects successively focus their attention on different objects in the scene (Cheng, Eysel, and Vidyasagar, 2004). However, in visual searches involving isoluminant stimuli, parvocellular visual stream also increases the influence of colour (Braithwaite et al, 2010). Here, we demonstrate the role of the higher regions of the cortical visual system in visual-search tasks. We used a chromatic adaptation technique in which subjects underwent adaptation to coloured light with an eye, and the performance in visual searches with chromatic targets was measured separately for each eye. Then, we determined the time required for the serial searches performed in these tasks; the searches performed after chromatic adaptation required more time than pre-adaptation searches performed with eyes that had not undergone chromatic adaptation. Our data are consistent with the hypothesis that chromatic information processing after binocular fusion has an important effect on the performance in the visual search task.
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