Visual and auditory stimuli were presented separately. Each participant performed one test for each modality. Order of modality presentation was counterbalanced across participants. For each
run, 20 five-item sequences of words and 20 five-item sequences 1260 MACKEN, TAYLOR, AND JONES
of nonwords were selected randomly (without replacement) from the available 25 sequences in each set. Each test consisted of 40 unique sequences. Order histories of words and nonwords were (n 1) counterbalanced within each test. An additional six practice trials were presented at the start of each test to familiarize participants with the procedure.