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. 2019 May 22;10:529. doi: 10.3389/fneur.2019.00529

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Copyright © 2019 Zele, Adhikari, Cao and Feigl.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Pupil responses to temporal white noise. (A) Temporal white noise is presented for 5,000 ms then repeated; pupil diameter is steady during continuous presentation of the temporal white noise. (B) A 1,000 ms blank equal to the time average chromaticity and retinal illuminance of the orange field (no pulse, only field) is inserted within the temporal white noise; this blank field does not cause a pupil constriction. Panels show the average ±95% confidence limits for each of three observers (traces vertically offset; ~100 trials per observer). Pupil responses are normalized to the diameter at 2 s (vertical line) during each 5,000 ms repeat.