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Fig. 3 | Journal of NeuroEngineering and Rehabilitation

Fig. 3

From: Discriminability of multiple cutaneous and proprioceptive hand percepts evoked by intraneural stimulation with Utah slanted electrode arrays in human amputees

Fig. 3

Quality discrimination trials. Figure depicts the location of electrodes which evoked different hand sensations, as well as a confusion matrix showing the discrimination performance, and the overall accuracy relative to chance. Full descriptions of the percepts are presented next to the image of the hand and are abbreviated to the bold word in the confusion matrix. Confusion matrices are square, such that the correct answers lie along the diagonal. Asterisks over the bar plot indicates statistical significance with regards to the aggregate data (primary outcome measure). Asterisks overlaid on the confusion matrix indicate statistical significance with regards to an individual condition (secondard outcome measure with limited statistical power). Subject S3 successfully discriminated between stimulation of two different USEA electrodes that evoked sensation at the same location, but with different qualities (vibration versus tingle). Regarding the locations of the two percepts, the subject said they were “Right on, exact same space.” He also indicated that these sensory percepts were the same intensity level. The subject successfully performed the classification in 30/30 trials (p < 0.0001, binomial test). * = p < 0.05, ** = p < 0.01, *** = p < 0.001, **** = p < 0.0001; binomial test

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