 He performed experiments in the vestibular system (sense of balance) with rhesus monkeys and found the thalamic relay nucleus, nucleus ventralis posterior inferior (VPI) for the vestibular projection to the cortex.In a second project, he investigated – with the rhesus monkey – normothermic perfusion as a therapeutic means with spinal cord compression, and as a third project the alterations of the auditory evoked potentials under respiratory stress.In 1978 a further Citation Classic appeared with the discovery that the supplementary motor area (SMA) is active prior to voluntary actions and also prior to the activation of the primary motor cortex (M1, Brodmann-Area4).