Dear Dr. Qwerty, Below is a link to the forthcoming BBS target article Are developmental disorders like cases of adult brain damage? Implications from connectionist modelling by Michael Thomas and Annette Karmiloff-Smith http://www.bbsonline.org/Preprints/Thomas/Referees/ This article has been accepted for publication in Behavioral and Brain Sciences (BBS), an international, interdisciplinary journal providing Open Peer Commentary on important and controversial current research in the biobehavioral and cognitive sciences. Commentators must be BBS Associates or suggested by a BBS Associate. To be considered as a commentator for this article, to suggest other appropriate commentators, or for information about how to become a BBS Associate, please reply by EMAIL within within three (3) weeks to: calls(a)bbsonline.org The Calls are sent to 10,000 BBS Associates, so there is no expectation (indeed, it would be calamitous) that each recipient should comment on every occasion! 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(In the meantime, your name, address and email address will be entered into our database as an unaffiliated investigator.) ======================================================================= IMPORTANT To help us put together a balanced list of commentators, please give some indication of the aspects of the topic on which you would bring your areas of expertise to bear if you were selected as a commentator. To help you decide whether you would be an appropriate commentator for this article, an electronic draft is retrievable from the online BBSPrints Archive, at the URL that follows the abstract below. _______________________________________________________________________ ARE DEVELOPMENTAL DISORDERS LIKE CASES OF ADULT BRAIN DAMAGE? IMPLICATIONS FROM CONNECTIONIST MODELLING Michael Thomas and Annette Karmiloff-Smith Neurocognitive Development Unit Institute of Child Health London, UK KEYWORDS: Acquired and developmental disorders, connectionist models, past tense, reading, modularity ABSTRACT: It is often assumed that similar behavioural impairments found in cases of adult brain damage and developmental disorders correspond to similar underlying causes, and can serve as convergent evidence to the modular structure of the normal adult cognitive system. We argue that this correspondence is contingent on an unsupported assumption that atypical development can produce selective deficits while the rest of the system develops normally (Residual Normality), an assumption that tends to bias data collection in the field. Based on a review of connectionist models of acquired and developmental disorders in the domains of reading and past tense, as well as on new simulations, we explore the computational viability of the assumption and the potential role of development in producing deficits. Simulations demonstrate that damage to a developmental model can produce very different effects depending on whether it occurs prior to or following the training process. Since developmental disorders typically involve damage prior to learning, we conclude that the developmental process is a key component of the explanation of endstate impairments. Further simulations demonstrate that in simple connectionist learning systems, the assumption of Residual Normality is undermined by processes of compensation elsewhere in the system. We outline the precise computational conditions required for Residual Normality to hold in development, and suggest that in many cases it is an unlikely hypothesis. We conclude that in developmental disorders, inferences from deficits to underlying structure crucially depend on developmental conditions, and that the process of ontogenetic development cannot be ignored in constructing models of developmental disorders. http://www.bbsonline.org/Preprints/Thomas/Referees/ ====================================================================== IMPORTANT Please do not prepare a commentary yet. Just let us know, after having inspected it, what relevant expertise you feel you would bring to bear on what aspect of the article. We will then let you know whether it was possible to include your name on the final formal list of invitees. ======================================================================= *** SUPPLEMENTARY ANNOUNCEMENT *** (1) Call for Book Nominations for BBS Multiple Book Review In the past, Behavioral and Brain Sciences (BBS) had only been able to do 1-2 BBS multiple book treatments per year, because of our limited annual page quota. 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