Abstract
There is increasing evidence that spontaneous eye blinks are related to mental states and can predict performance in certain tasks because of their relation to dopaminergic activity. Moreover, it has been shown that eye blinks while performing visual tasks are preferably executed not before all available information and even the manual response has been processed and given. Thus, blinks provide a natural endpoint of visual information processing. In the present study, we investigate to what degree such functional assignment of eye blinks also applies when only auditory stimuli are processed. For that, we present blink analyses on data of an auditory stock price monitoring task to examine the timing and frequency of blinks relative to the temporal dynamics of the task and different kinds of available cues. Our results show that blinks are meaningfully rather than randomly paced, although no visual information has to be processed. Blinks are significantly accelerated if a no-go trial is indicated which made all the subsequent information irrelevant. Although the stimuli were exclusively auditory, blinks were mostly inhibited during stimulus presentation. Taken together, blinks depend on the information being presented and mark a distinct point in time at which this information is conclusively processed. These findings deliver further support for the usefulness of eyeblink analyses, independently of the modality of the information being processed.
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Acknowledgements
We would like to thank two anonymous reviewers for their helpful comments on a previous version of this manuscript.
Funding
The original study was funded by the Deutsche Forschungsgemeinschaft (DFG GE 1920/3-1).
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This study was in compliance with the Declaration of Helsinki and was approved by the local ethics committee of the Leibniz Research Centre for Working Environment and Human Factors. All participants gave their informed written consent prior to the experimental procedures.
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Kobald, S.O., Wascher, E., Heppner, H. et al. Eye blinks are related to auditory information processing: evidence from a complex speech perception task. Psychological Research 83, 1281–1291 (2019). https://doi.org/10.1007/s00426-017-0952-9
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DOI: https://doi.org/10.1007/s00426-017-0952-9