Abstract
Attention plays a critical role in action selection. However, the role of attention in eye movements is complicated as these movements can be either voluntary or involuntary, with, in some circumstances (antisaccades), these two actions competing with each other for execution. But attending to the location of an impending eye movement is only one facet of attention that may play a role in eye movement selection. In two experiments, we investigated the effect of arousal on voluntary eye movements (antisaccades) and involuntary eye movements (prosaccadic errors) in an antisaccade task. Arousal, as caused by brief loud sounds and indexed by changes in pupil diameter, had a facilitation effect on involuntary eye movements. Involuntary eye movements were both significantly more likely to be executed and significantly faster under arousal conditions (Experiments 1 and 2), and the influence of arousal had a specific time course (Experiment 2). Arousal, one form of attention, can produce significant costs for human movement selection as potent but unplanned actions are benefited more than planned ones.
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Notes
After completion of this experiment, participants also completed an additional experiment of 96 trials of the same task without warning signals and were asked to rate if they made an error and how confident they were in that judgment. This data was obtained for a different purpose from the present paper.
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DiGirolamo, G.J., Patel, N. & Blaukopf, C.L. Arousal facilitates involuntary eye movements. Exp Brain Res 234, 1967–1976 (2016). https://doi.org/10.1007/s00221-016-4599-3
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DOI: https://doi.org/10.1007/s00221-016-4599-3