In so far as inactivity is merely an expression of apathy, its causation will be considered in connection with the psychology of the stupor reaction as a whole. In so far as there may be specific factors, however, it may be of interest to consider what information the patients themselves give us from time to time as to what determined their inactivity. It is really surprising how frequently something can be gained either from careful notes taken during the stupor or from the retrospective accounts of the psychotic experiences. Of course when one considers the degree of amnesia which is usually present and the extent of the intellectual defect in general, it becomes obvious that one cannot think of getting anything like a complete explanation of the behavior of any given case. Nevertheless this material is quite suggestive in the mass; it gives one some idea of the mental state as a whole. Among 40 cases, 27 offered some explanation either during or following the psychosis. Of these, 20 spoke of feeling dead, numb or drugged, or feeling as if paralyzed or having lockjaw. This group, just half of all the cases, apparently ascribed their disability to something which seemed physical. One might call them somatopsychic cases. The other 7 gave more allopsychic explanations: 3 attributed their inactivity to outside influence; 3 more said they were afraid (one of these because she imagined herself to be in prison), which is analogous to the outside influence; the 7th case thought she would injure people if she moved.