Abstract
It was found possible to induce short-lasting electrocortical activation by pinching the toe pads of chronic preparations which retained only the fibers of the basis pedunculi, classical ascending fibers and ascending reticular fibers having been transected at the rostral pons. More durable electrocortical activation was produced by subjecting these preparations to a cold environment which presumably served as a more severe and continuous stimulus. It is believed that these results are explainable on the basis of activation over the ascending spinocortical, cuneatocortical, and gracilocortical fibers of Brodal and Walberg. It is speculated that these ascending pyramidal fibers send collaterals into some part of the cephalic activating system at levels rostral to the pons.
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