Fig. 5: Perceived intensity increases linearly with ICMS amplitude. | Nature Biomedical Engineering

Fig. 5: Perceived intensity increases linearly with ICMS amplitude.

From: Evoking stable and precise tactile sensations via multi-electrode intracortical microstimulation of the somatosensory cortex

Fig. 5: Perceived intensity increases linearly with ICMS amplitude.The alternative text for this image may have been generated using AI.

a, Normalized magnitude ratings following ICMS delivered through single electrodes for three participants. Each line denotes ratings for one electrode. The different colours denote different participants. The black line denotes the mean across electrodes and participants. b, Normalized ratings when ICMS and mechanical stimuli are interleaved for one electrode. Indentations were delivered to the location on the skin corresponding to the PF of that electrode. c, Equal intensity contours for ICMS-evoked and mechanically evoked sensations. Each line represents the contour derived from the ratings from one stimulating electrode. The black line corresponds to the contour of the electrode shown in b. While perceived magnitude increases with amplitude on all electrodes, the range of the evocable intensities varies widely across electrodes. Data from b and c are from participant C1 only. d, Goodness of fit for ICMS or mechanical intensity ratings when using power adjusted versus linear adjusted functions. Power functions provide better fits for intensity ratings of skin indentations but not ICMS.

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