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Response accuracy of auditory-only (AO) and auditory-visual (AV) conditions in the (A) younger and (B) older groups and of (C) the visual-only condition with two-alternative (VO2) and three-alternative (VO3) choice in both groups. Response accuracy scores in AV and AO conditions are plotted for the low, middle, and high signal-to-noise ratio (SNR) conditions. AV conditions consisted of two conditions: AV congruent (AVc) and incongruent (AVi) conditions.
