Choosing between models of choosing between sequences: comments on Shidoji (1993).

Previous studies have used a sequence choice procedure to explore the cognitive representations of forthcoming response sequences. Subjects choose as quickly as possible between memorized sequences, and differences in the choice reaction time for a given sequence as a function of the other possible sequence are used to model the structures and processes underlying the choice. In 1993 Shidoji reported experiments to distinguish between two models of choice. One model assumes a hierarchical editing process. The other model assumes that choice. One model assumes a hierarchical editing process. The other model assumes that choice time depends only on the total number of responses in the sequences to be distinguished. Shidoji argued that his data supported both models. He also suggested boundary conditions for the applicability of each model. I argue that the hierarchical editor model can account successfully for Shidoji's results.