Evaluation of a pneumatically driven tactile stimulator device for vision substitution during fMRI studies

Area of Science:

• Neuroscience
• Biomedical Engineering
• Sensory Perception

Background:

• Functional magnetic resonance imaging (fMRI) presents challenges for tactile perception studies due to environmental constraints.
• Existing actuators allow vibrotactile stimuli but cannot project spatially extended tactile patterns.

Purpose of the Study:

• To introduce a novel pneumatically-driven tactile device (PTD) for advanced tactile perception research within an fMRI environment.
• To demonstrate the PTD's capability to deliver complex 2D tactile stimuli during fMRI scans.

Main Methods:

• Development and implementation of a pneumatically-driven tactile device (PTD) capable of delivering 2D tactile images up to 64 pixels.
• Integration of the PTD into a 2 Tesla (2T) fMRI environment, verifying artifact-free operation.
• Utilizing dedicated software for complex paradigm generation and automated operation.

Main Results:

• The PTD successfully delivered arbitrary time sequences of 2D tactile images within the fMRI scanner.
• The device operated without introducing significant artifacts into the fMRI data.
• An fMRI study using an event-related protocol with six subjects demonstrated the PTD's reliability.

Conclusions:

• The pneumatically-driven tactile device (PTD) is a reliable tool for fMRI studies of tactile perception.
• The PTD overcomes previous limitations by enabling the presentation of complex, spatially extended tactile stimuli during fMRI.
• This advancement facilitates more sophisticated investigations into the neural processing of touch.