Integration of auditory and vibrotactile stimuli: Effects of frequency

Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
The Journal of the Acoustical Society of America (Impact Factor: 1.5). 05/2010; 127(5):3044-59. DOI: 10.1121/1.3365318
Source: PubMed


Perceptual integration of vibrotactile and auditory sinusoidal tone pulses was studied in detection experiments as a function of stimulation frequency. Vibrotactile stimuli were delivered through a single channel vibrator to the left middle fingertip. Auditory stimuli were presented diotically through headphones in a background of 50 dB sound pressure level broadband noise. Detection performance for combined auditory-tactile presentations was measured using stimulus levels that yielded 63% to 77% correct unimodal performance. In Experiment 1, the vibrotactile stimulus was 250 Hz and the auditory stimulus varied between 125 and 2000 Hz. In Experiment 2, the auditory stimulus was 250 Hz and the tactile stimulus varied between 50 and 400 Hz. In Experiment 3, the auditory and tactile stimuli were always equal in frequency and ranged from 50 to 400 Hz. The highest rates of detection for the combined-modality stimulus were obtained when stimulating frequencies in the two modalities were equal or closely spaced (and within the Pacinian range). Combined-modality detection for closely spaced frequencies was generally consistent with an algebraic sum model of perceptual integration; wider-frequency spacings were generally better fit by a Pythagorean sum model. Thus, perceptual integration of auditory and tactile stimuli at near-threshold levels appears to depend both on absolute frequency and relative frequency of stimulation within each modality.

Download full-text


Available from: Louis D Braida, Sep 04, 2014
  • Source
    • "Average signal levels employed at 250 Hz ranged from -30.6 dB re: 1 μm (S2) to -16.0 dB (S4) with a mean of -24.3 ± 5.7 dB (consistent with both the range over subjects and the mean of -24.2 dB reported by Wilson et al.[25]. At 50 Hz, the average signal levels ranged from -0.68 dB re: 1 μm peak (S3) to -6.38 dB (S1) with a mean of - 2.85 ± 2.7 dB (consistent with the range and mean of 1.0 dB reported by Wilson et al.[25]. The largest variability across subjects was observed at 250 Hz where the threshold of the 42-year old subject was higher than the other three subjects (whose mean age was 23 years). "

    Full-text · Technical Report · Jan 2016
  • Source
    • "Early research indicated that tactile stimulus could be seen to enhance simultaneous auditory stimuli, but the interpretation of results pointed towards an affection of response criteria and perceptual sensitivity due to increases to both signal and noise [17]. Other studies indicate that the detection of a stimulus is enhanced when it simultaneously registers with two or more sensory modalities [18]. "

    Full-text · Conference Paper · Jan 2015
    • "In particular, recent research has shown that the speech production system is responsive to the provision of enhanced kinaesthetic information . Further the type, placement, and context in which tactile-kinaesthetic input is provided are essential in facilitating sensory-motor re-organization (Gick, Ikegami, & Derrick, 2010;Wilston, Reed, & Braida, 2010). These fi ndings are supported by behavioural studies that indicate sensory augmentation can play a role in enhancing motor learning in general, particularly when stimuli are diffi cult to perceive (Atchy-Dalama, Peper, Zanone, & Beek, 2005). "
    [Show abstract] [Hide abstract]
    ABSTRACT: This study evaluates perceptual changes in speech production accuracy in six children (3-11 years) with moderate-to-severe speech impairment associated with cerebral palsy before, during, and after participation in a motor-speech intervention program (Prompts for Restructuring Oral Muscular Phonetic Targets). An A1BCA2 single subject research design was implemented. Subsequent to the baseline phase (phase A1), phase B targeted each participant's first intervention priority on the PROMPT motor-speech hierarchy. Phase C then targeted one level higher. Weekly speech probes were administered, containing trained and untrained words at the two levels of intervention, plus an additional level that served as a control goal. The speech probes were analysed for motor-speech-movement-parameters and perceptual accuracy. Analysis of the speech probe data showed all participants recorded a statistically significant change. Between phases A1-B and B-C 6/6 and 4/6 participants, respectively, recorded a statistically significant increase in performance level on the motor speech movement patterns targeted during the training of that intervention. The preliminary data presented in this study make a contribution to providing evidence that supports the use of a treatment approach aligned with dynamic systems theory to improve the motor-speech movement patterns and speech production accuracy in children with cerebral palsy.
    No preview · Article · Feb 2014 · International Journal of Speech-Language Pathology
Show more