FIGURE 4.

Pupil response latency but not size depends on speed of listeners’ decision. Grand average waveforms for pupil responses to vw3 based on (A–E) a median split of behavioral RTs and (F–J) the reported vowel category (e.g., “a” vs. “u”). (E) Pupil latencies strongly depend on speed of listeners’ decision. Slow RTs are associated with slower pupil responses to ambiguous token. (D) Pupil size is not dependent on RTs. (I) SNR has a sole effect on pupil response magnitudes when split by listeners’ identification (i.e., reporting vw3 as “u” vs. “a”). Pupil responses are again largest for 0 dB SNR speech compared to other noise conditions.