The "inverted-U" of cognitive effort across speech rates holds for simple but not complex sentence structures.
O'Leary RM; Zavlun N; Kinney A; Wingfield A · 2025 · Frontiers in psychology
WASTE classifies this as Negative / Null Result Report · AI classification, approximate
The study found no significant effect — useful as a negative control or null benchmark for your own design.
Abstract (excerpt)
Pupil dilation has become a well-established physiological index of cognitive effort. Here we examined the often-cited finding of an inverted U-shaped function of pupil size across the continuum from highly degraded to clear speech. Unlike…
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Metadata source: Europe PMC · DOI 10.3389/fpsyg.2025.1685938