John is studying for his psychology exam on 4 successive nights, and each night he studies in a different location, at a different time of day, and

John is studying for his psychology exam on 4 successive nights, and each night he studies in a different location, at a different time of day, and comes up with different examples of the theories he is trying to learn. This is illustrative of which explanation of the spacing effect ? a) encoding variability b) retrograde amnesia c) attention deficit d) anterograde amnesia. learning theories by w> Scott Terry