Beschreibung:
<jats:p> Experimental evidence is obtained that, coincident with a state of not too severe concussion, the blood-brain barrier system becomes more permeable to phosphate ions. The permeability returns to normal when the animal recovers and shows normal activity. Arguments are presented in favor of the hypothesis that dysfunction of the central nervous system during concussion is related to a disturbed electrolyte balance in the fluids of the brain caused by a piezochemical disturbance of the blood-brain barrier membranes (presumably the astropods of the astrocytic cells). </jats:p>