Sonya is trying to remember events from her life as an 18-month-old. however, as hard as she might try, she has no conscious memory for anything that occurred before her third birthday. this is likely due to the fact that her hippocampus, which is involved in storing explicit memories, was not fully developed at that age. this inability to remember events when she was 3 years old and younger is called

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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.

we need an attachment to see what you are talking about.