In the famous case of H. M., after having part of his brain removed, he could no longer . Group of answer choices make sense of memories retrieve memories pay attention to specific stimuli form new memories

The correct answer is Form new memories

It was thanks to the patient H.M. that the mechanisms for storing chronological facts, names, objects began to be understood; in short, from memory.

Before Molaison underwent experimental surgery in 1953 that removed an important region of his brain, this was an abstract concept. The doctors knew that the memory existed, but they had no idea where it was. Forgetfulness and amnesia were treated more in the offices of psychoanalysts than neuroscientists. Nobody was suspicious of the existence of different types of memory: a short-term memory, which allows you to memorize a phone number and dial it a short time later, and then forget it; and another long-term, through which facts, names and acquired skills are stored. Much less could scientists assume that long-term memory has subdivisions.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.