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A method for the generation of complex vibrotactile stimuli
J W Morley1, E N Crawford, D G Ferrington
1School of Physiology and Pharmacology, University of New South Wales, Sydney, Australia.
Journal of Neuroscience Methods
|June 1, 1991
Summary
This study details a novel method for creating complex vibrotactile stimuli using computer-generated sine waves and specialized hardware. This technique allows for precise control over stimulus properties for research applications.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Sensory Perception
Background:
- Vibrotactile stimuli are crucial for understanding tactile sensation.
- Generating complex, controlled vibrotactile waveforms presents technical challenges.
Purpose of the Study:
- To describe a method for generating complex vibrotactile stimuli.
- To enable precise control over stimulus parameters like frequency and amplitude.
Main Methods:
- Utilizing computer-generated sine wave data and purpose-built hardware.
- Summing two sine waves with different frequencies to create a complex waveform.
- Employing a dual synchronous arbitrary function generator with digital-to-analogue converters and a summing amplifier.
Main Results:
- Successfully generated a complex vibrotactile stimulus with high-frequency and low-frequency beat components.
- Achieved a fixed frequency ratio and no phase drift between component sine waves.
- Enabled easy alteration of amplitude ratios and gating of the stimulus.
Conclusions:
- The described method provides a robust and controllable way to generate complex vibrotactile stimuli.
- This technique facilitates precise sensory stimulation for research in human subjects and animals.
- The system offers flexibility for investigating tactile perception and neural responses.