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ERIC Number: EJ859943
Record Type: Journal
Publication Date: 2009-Oct
Pages: 3
Abstractor: As Provided
Reference Count: 10
ISSN: ISSN-0033-295X
Postscript: More Problems with Botvinick and Plaut's (2006) PDP Model of Short-Term Memory
Bowers, Jeffrey S.; Damian, Markus F.; Davis, Colin J.
Psychological Review, v116 n4 p995-997 Oct 2009
Presents a postscript to the current authors' comment on the original article, "Short-term memory for serial order: A recurrent neural network model," by M. M. Botvinick and D. C. Plaut. In their commentary, the current authors demonstrated that Botvinick and Plaut's (2006) model of immediate serial recall catastrophically fails when familiar letters are tested in untrained positions within a list (Simulation 2), and a modified version of their model with a distributed letter coding scheme also fails to recall familiar (and novel) letters when tested in untrained positions (Simulation 7). That is, short-term memory (STM) did not generalize to all possible test sequences. Botvinick and Plaut rejected these claims and reported a simulation in which a new version of their model recalls familiar (and novel) items in novel positions. What Botvinick and Plaut did not emphasize, however, was that the model was trained on all the letters in all positions of the list. So, in principle, the model could recall novel syllables (and familiar syllables in untrained positions) by recalling familiar phonemes in trained positions. The current authors ran two new simulations to further highlight the generalization constraints associated with these learned conjunctive codes. (Contains 2 figures.)
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Publication Type: Journal Articles; Opinion Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A