![]() Differences in pupil sizes positively related with greyscales scores. These differences were mainly driven by visual information in the periphery. Pupil sizes of 41 healthy participants fixating the center were influenced stronger by the differential background luminance of the left side compared to the right side of the visual display. Here, we objectively assessed lateralized attention over time, exploiting the phenomenon that changes in the pupil reflect the allocation of attention in space. To date, no exhaustive explanation to this phenomenon has been provided. Pseudoneglect is often stable within experiments, but differs vastly between investigations and is sometimes directed to the left, sometimes to the right. Spatial attention is generally slightly biased leftward (“pseudoneglect”), a phenomenon typically assessed with paper-and-pencil tasks, limited by the requirement of explicit responses and the inability to assess on a subsecond timescale.
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