We examined auditory (A) and tactile (T) interactions in two areas: (1) the detectability of A and T stimuli in unimodal and combined-modality (A+T) presentation as a function of stimulus level; and (2) the loudness of various combinations of A and T stimuli presented at supra-threshold levels. Auditory stimuli were pure tones presented binaurally through headphones in broadband noise; tactile stimuli were sinusoids delivered through a single-channel vibrator to the left middle fingertip. In the first experiment, performance was measured using a fixed-level 2I, 2AFC procedure for 250-Hz single-modality A and T stimuli and for four different A+T stimuli created through all combinations of the following stimuli: A at 0 and 2 dB SL and T at 0 and 2 dB SL, where the intensity corresponding to 0 dB SL was established under unimodal conditions. Preliminary results indicate that A+T performance is significantly higher than that obtained through either modality alone but that there are no significant differences among any of the combined A+T conditions, suggesting that A+T performance may have been limited by ceiling effects under the current methodology. In the second experiment, a 200-Hz auditory comparison tone was matched in loudness to various combinations of supra-threshold auditory and tactile stimuli (A+T) and purely auditory stimuli (A+A). The A stimuli were presented at a level of roughly 25 dB SL and the T stimuli were presented at a level that was matched roughly in loudness to that of the A stimuli. Preliminary results in this area indicate that the matched intensity of the comparison tone is less when the reference frequencies of the A+T and A+A stimuli are close together than when they are separated by an octave in frequency. This result suggests that A+T integration may operate in a manner similar to that found in auditory critical band studies, further supporting a strong frequency relationship between the auditory and somatosensory systems. [Work supported in part by a Hertz Foundation Fellowship and grants from the National Institutes of Health T32-DC000126-25 and ROI-DC000117].