Baseline pupil dilation already differs before any target word because degraded listening is effortful

Evidence

This overall smaller increase in pupil dilation can be explained by the fact that these curves are normalized to a baseline of 200 ms preceding the presentation of each critical item per trial, participant and condition. Listening to degraded speech is by itself more effortful than listening to natural speech (e.g., Winn et al. 2015 ), and therefore there is a difference in the baseline between DS and NS. These differences in the baseline can be explained by the difference in processing degraded versus natural speech, and are independent of the effects of semantic integration on lexical competition. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3994

Categorization

• DEFINE: Explains the methodological convention of normalizing pupil dilation to a 200 ms pre-item baseline and why baseline differences between conditions are meaningful.
• corroborated: 2 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 3994
• XREF: connects to: Pupil diameter must be controlled for lighting in listening-effort experiments; Degraded speech processing raises baseline cognitive effort independently of semantic context — Dijk, Pim van, Physiology, Psychoacoustics and…, 3978

Broader Connections

• Degraded speech processing raises baseline cognitive effort independently of semantic context #corroborates (0.95) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3978