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. 2020 Oct 7;31(2):949–960. doi: 10.1093/cercor/bhaa267

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© The Author(s) 2020. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abrupt increases of stimulus intensity are the temporal equivalent of spatial edges. Left column: representative plots of a spatial edge with large differential intensity (high contrast, top) and small differential intensity (low contrast, bottom). The large differential results in a sharper and more clearly defined edge, which identifies an object with higher certainty. Right column: abrupt increases of auditory intensity with large (top) and small (bottom) differentials. As in the visual domain, a larger differential results in a sharper, more clearly defined edge, albeit in time rather than in space. A sharper temporal edge identifies the occurrence of an event with higher certainty.