In mental processes such as thoughts, emotions, memory, consciousness, even knowledge of one's own identity—the processes that make a person feel whole—may seem to be split off from one another.

   Disassociation

Explanation:  Feeling of disconnected thoughts, feelings, memory and even loss or diminished sense of identity is a mental disorder called disassociation. It can occur as a consequence of surviving trauma, and occurs as a separation of thoughts, feelings, identities, and perceptions, which should function as a whole. Amnesia can sometimes be a consequence of this disorder.  Due to the trauma surviving, the person suffering from this disorder separates the memory of a certain place related to the trauma from the event itself, or the time of the event, circumstances, in the mental processes and thus trying to reduce the effect of the trauma that causing pain, suffering, etc.

answer; i believe that the correct answer is ( rivers);

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.