Abstract
To estimate the time-to-contact (TTC) of a moving object, numerous studies have focused on the type of information or gaze strategy used by the observer. However, it remains to be determined whether and how attention could affect TTC estimation. In particular, how does TTC estimation operate when less attention is available? To answer this question, we conducted two experiments in which the participants had to perform an absolute (Experiment 1) or relative (Experiment 2) prediction-motion task, either alone (i.e., in single-task condition) or along with a secondary, visual working-memory task (i.e., in dual-task condition). In both experiments, we found that TTC estimation was superior in dual-task condition relative to single-task condition. This finding suggests that the reduction of available attention actually improves TTC estimation. We discuss possible explanations as well as theoretical implications for this seemingly counter-intuitive finding. Further research is needed to investigate if (in)attention facilitates or only shifts TTC estimation.
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Notes
According to Matthews and Meck (2016), two hypotheses may explain why attention may influence the clocking strategy: because an attentional gate controls the flow of pulses from a pacemaker into an accumulator, or because attention determines the latency with which the flow of pulses begins after the stimulus onset.
Because TTC can be both an independent variable (the occlusion time applied to the moving object) and also the dependent variable that has to be judged (the moment the object is thought to arrive at the finishing line), we will refer to actual TTC as being the independent variable and estimated TTC as the judgement of the participants.
According to Läkens (2013), “CL effect size expresses the probability that a randomly sampled person from one group will have a higher observed measurement than a randomly sampled person from the other group (for between-designs) or (for within-designs) the probability that an individual has a higher value on one measurement than the other”.
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We would like to thank Alice Parmentier, Old Lo, Kévin Michaud and Benjamin Gouyou for their help with data collection.
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Baurès, R., Maquestiaux, F., DeLucia, P.R. et al. Availability of attention affects time-to-contact estimation. Exp Brain Res 236, 1971–1984 (2018). https://doi.org/10.1007/s00221-018-5273-8
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DOI: https://doi.org/10.1007/s00221-018-5273-8