Influence of rhythmic contexts on perception: No behavioral and eye-tracker evidence for rhythmic entrainment.

Entrainment theories propose that attention inherently oscillates between moments of attentional enhancement and disengagement. Consequently, perceptual and response benefits have been reported in tasks with a rhythmic structure. In the present study, we report two preregistered auditory experiments attempting to replicate previous supporting behavioral evidence of entrainment theories. In addition, we incorporated eye-tracker measures. Both Experiment 1 (duration discrimination task) and Experiment 2 (pitch discrimination task) showed no phase-specific benefit of rhythmic sequences compared to arrhythmic ones. Importantly, a tonic larger pupil size for arrhythmic conditions was observed irrespective of target phase, suggesting higher processing demands or arousal state imposed by a sustained uncertain context. Overall, the present results call into question whether the perceptual benefits predicted by entrainment theories are generalizable across all experimental designs and paradigms. On the contrary, our findings join a large group of studies that have failed to replicate the foundational results of attentional entrainment.