Prior exposure to original speech improves comprehension of vocoded versions

Evidence

Specifically, standard trials are detected with a higher confidence level (paired t -test, p = 3.1 × 10‑5 ) while no difference emerged for deviant trials (p = 0.41). … The hypothesis that subjects understand more the noise-vocoded speech presented after the prime is met for standard trials, therefore the analysis is conducted on them. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4409

Categorization

• QUESTION: Why does the prime boost confidence only for signal-congruent (‘standard’) trials and not for the physically altered ‘deviant’ stream? The deviant contained a ~5s inconsistent portion — does the prime help at all on the intact stretches?