Enhancement of response times to bi- and tri-modal sensory stimuli during active movements

  • David HechtEmail author
  • Miriam Reiner
  • Avi Karni
Research Article


Simultaneous activation of two sensory modalities can improve perception and enhance performance. This multi-sensory enhancement had been previously observed only in conditions wherein participants were not performing any movement. Since tactile perception is attenuated during active movements, we investigated whether a bi- and a tri-modal enhancement can occur also when participants are presented with tactile stimuli, while engaged in active movements. Participants held a pen-like stylus and performed bidirectional writing-like movements inside a restricted workspace. During these movements participants were given a uni-modal sensory signal (visual––a thin gray line; auditory––a brief sound; haptic––a mechanical resisting force delivered through the stylus) or a bi- or tri-modal combination of these uni-modal signals, and their task was to respond, by pressing a button on the stylus, as soon as any one of these three stimuli was detected. Results showed that a combination of tri-modal signals was detected faster than any of the bi-modal combinations, which in turn were detected faster than any of the uni-modal signals. These facilitations exceeded the “Race model” predictions. A breakdown of the time gained in the bi-modal combinations by hemispace, hands and gender, provide further support for the “inverse effectiveness” principle, as the maximal bi-modal enhancements occurred for the least effective uni-modal responses.


Multi-sensory enhancement Tri-modal Detection time Tactile attenuation Inverse effectiveness 



This research was funded by the EU research project PRESENCCIA––Presence: Research Encompassing Sensory Enhancement, Neuroscience, Cerebral-Computer Interfaces and Applications. We thank Mr. Gad Halevy for programming the computer for the experiment, and Ms. Ayelet Gal-Oz for her help in collecting the data. We also thank Mrs. Tatiana Gelfeld for her help in the race-model analysis.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.The Touch Laboratory, Department of Education in Technology and ScienceTechnion - Israel Institute of TechnologyHaifaIsrael
  2. 2.The Brain-Behavior Research CenterUniversity of HaifaHaifaIsrael

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