According to Indexing Theory, _______

According to indexing theory, _______. (Select all that apply.)

A) the engram consists of cortical neurons activated at the time of the learning experience
B) the engram consists of neurons in the hippocampus activated by the learning experience
C) the engram consists of both cortical and hippocampal neurons
D) there is no content in the index
E) memory retrieval occurs when a subset of the original neocortical pattern activates the index