You can read about a Scheme program that drives wheelchairs using machine learning and induction here:
;; Larceny version. ;; This program is part of a pattern recognition ;; system that drives a wheel-chair for quadriplegic ;; people: www.ciaem.org.br/ciaem.qps/Ref/QUIS-7GJP7J ;; A description of the complete system, written in ;; Scheme by Philippos, will be published in a paper ;; by Marcus Vinicius dos Santos, that can be reached ;; at web.mac.com/marcusvsantos/iWeb/Site/About%20Me.html ;; The wheel chair learns how to recognize EMG signals ;; from facial muscles. A neural network recognizes ;; the coeficients of a polynomial approximation of ;; the signal, and drives the chair accordingly. ;; The chair will be available soon, although the ;; pattern recognition version needs a special ;; order, and user training. This Larceny version ;; is not used in the chair prototype. ;; Store in file larcenet.scm