One of the Key Factors of Sperling's Experiment Was That

Multiple Choice

One of the key factors of Sperling's experiment was that

A) subjects knew which row of the matrix to recall before the material was presented.
B) subjects knew which row of the matrix to recall only after the material was presented.
C) the tone was presented simultaneously with the material to be recalled.
D) some subjects were allowed to view the material to be recalled longer than the other subjects.
E) some subjects were asked to recall letters following a high pitched tone and some following a low pitched tone.