Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.05.23.110882v1?rss=1 Authors: Robinson, E. M., Wiener, M. Abstract: The perception and measurement of spatial and temporal dimensions have been widely studied. However whether these two dimensions are processed independently is still being debated. Additionally whether EEG components are uniquely associated with time or space or whether they reflects a more general measure of magnitude remains unknown. While undergoing EEG subjects traveled a randomly predetermined spatial or temporal interval and were then instructed to reproduce the interval traveled. In the task the subjects travel speed varied for the estimation and reproduction phases of each trial so that one dimension could not inform the other. Behaviorally subject performance was more variable when reproducing time than space but overall just as accurate; notably behavior was not correlated between tasks. EEG data revealed during estimation the contingent negative variation (CNV) tracked the probability of the upcoming interval regardless of dimension. However during reproduction the CNV exclusively oriented to the upcoming temporal interval at the start of reproduction. Further a dissociation between relatively early frontal beta and late posterior alpha oscillations was observed for time and space reproduction respectively. Our findings indicate that time and space are neurally separable dimensions yet are hierarchically organized across task contexts within the CNV signal. Copy rights belong to original authors. Visit the link for more info