... blood-vessels should produce a localized anaemia in those centers which lead to the antagonistic action. Or we might fancy that by extremely subtle machinery the resistance is increased in those tissues which lie between the various neurons, or we might even think of toxic and antitoxic processes in the cerebral regions; and any day may open entirely new ways of explanation. We may add that even if the mechanism of attention were completely explained, we are also still far from understanding the physiological changes which ... — Psychotherapy • Hugo Muensterberg
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