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>Effects of subjective visibility on our cognitive function: How visual attentional modulation correlates with subjective visibility
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Effects of subjective visibility on our cognitive function: How visual attentional modulation correlates with subjective visibility
Effects of subjective visibility on our cognitive function: How visual attentional modulation correlates with subjective visibility Visual attention enables us to perceive visual information selectively in our environment. The effects of visual attention, in general, correlate with physical saliences. Recent studies revealed that visual attentional modulation was also influenced by emotion, motivation and other subjective factors. This suggests that sub- jective information plays an important role for visual attentional modulation. However, how subjective visibility of informative cue affects visual attentional modulation remains enigmatic. Here, we examined the impact of subjective visibility on visual attentional modulation. In this study, we used classical Posner cueing task to quantify the attentional modulation with introduction of back- ward masking to modulate subjective visibility. Participants had to discriminate the location, where tilted target (in left or right) was presented, while cues presented before the target presentation instructed participants to orient their attention to peripheral visual space. To clarify the effects of subjective visibility, inter-stimulus interval (ISI) between cue and visual masking were varied as they reported four graded subjective visibilities. The cue was presented either at peripheral location, where target stimulus was presented (peripheral condition), or at central location, where target stimulus was not presented (central condition). Reaction time were faster when the cue was informative (valid cue) compared to when it was not informative (invalid cue) in both conditions. Then we also compared the reaction time in each four graded subjective visibilities. In valid condition, the reaction times were correlated with subjective visibilities in both conditions, while it was not correlated in invalid conditions. Then we calculated difference of reaction time between valid and invalid cue (Delta) to address how visual attentional modulation correlates with subjective visibility. The delta was correlated with subjective visibility, indicating subjective visibility enhanced visual attentional modulation. We will discuss these findings and preliminary fMRI data as to how subjective visibility enhance the visual attentional modulation.
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