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Mean peak pupil diameters and latencies by SNR. (A) Larger pupil size is observed at 0 dB SNR relative to unmasked and –5 dB SNR. (B) Peak pupil diameter is elevated at 0 dB SNR relative to the other two conditions. (C,D) In general, –5 dB speech shows the longest peak latencies of the three conditions. Pupil responses are delayed for 0 dB SNR speech and for categorically ambiguous speech (i.e., vw3 > vw1/5). errorbars = 1 SEM.
