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Responses per minute for “excuse me” (first row) and “Kevin” (second row) during DRA (open circles), NCR (filled triangles), and EXT (filled circles) across sessions, and cumulative initial-link selections during the preference assessment (third row) for Beth, Ed, Sam, and Lou across sessions. The data depicted prior to the phase line were collected during the efficacy evaluation, and the data after were collected during the preference assessment.
