FIG. 3.

(Color online) Multisensory cues enhance the CP of clear and especially noise-degraded speech. Individual points show each participant's psychometric slope for two different stimulus continua plotted against one another. Errorbars (±1 s.e.m.) show variance around the group average centroid. Points in the upper left half of each plot (above the diagonal) show an improvement in CP for that ordinate relative to the abscissa condition. A majority of participants show stronger CP when categorizing (A) clean compared to noisy speech sounds, (B) AV compared to A speech, and (D) AV+noise compared to A+noise speech. (C) AV and AV+noise speech yeild similar slopes.