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Single-modality signal levels employed for individual subjects tested in each of the four experiments. Auditory levels are for detection of a 250-Hz pure tone in 50-dB SPL broadband noise. Tactile levels are for detection of a 250-Hz sinusoidal vibration presented to the fingertip. Different symbols represent results obtained in different experiments. Some subjects participated in more than one experiment. Error bars are 2 SEM.
