He may forget events, and so give false witness as to the past.
One may forget himself also, and so have, in some degree, a different character, as is seen, in an exaggerated way, in persons who have so-called Dual Personality.

These patients suddenly fall into a secondary state, in which they forget all the events of their ordinary lives, but remember all the events of the earlier periods of the secondary personality.

This state may be described as "general" amnesia, in contrast to the "partial" amnesia of the other cases given, in which only particular classes of memories are impaired.
The impairment of memory with advancing years also illustrates both "general" and "partial" Amnesia.

The old man loses his memory of names, then of other words, then of events, and so gradually becomes incapable of much retention of any sort.
_Defects of Will--Aboulia._--A few words may suffice to characterize the great class of mental defects which arise on the side of action.
All inability to perform intentional acts is called Aboulia, or lack of Will.

Certain defects of speech mentioned above illustrate this: cases in which the patient knows what he wishes to say and yet can not say it.