Double dissociation without modularity: evidence from connectionist neuropsychology.

Double Dissociation: Understanding its Role in Cognitive Neuropsychology

The paper makes three points about the role of double dissociation in cognitive neuropsychology. First, arguments from double dissociation to separate modules work by inference to the best, not the only possible, explanation. Second, in the development of computational cognitive neuropsychology, the contribution of connectionist cognitive science has been to broaden the range of potential expla...

Evaluating computational models in cognitive neuropsychology: the case from the consonant/vowel distinction.

Caramazza et al. [Caramazza, A., Chialant, D., Capasso, R., & Miceli, G. (2000). Separable processing of consonants and vowels. Nature, 403(6768), 428-430.] report two patients who exhibit a double dissociation between consonants and vowels in speech production. The patterning of this double dissociation cannot be explained by appealing to sub-phonemic distinctions, such as sonority level or da...

Double dissociation, modularity, and distributed organization

Miiller argues that double dissociations do not imply underlying modularity of the cognitive system, citing neural networks as examples of fully distributed systems that can give rise to double dissociations. We challenge this claim, noting that such double dissociations typically do not "scale-up," and that even some single dissociations can be difficult to account for in a distributed system....

Connectionist Dissociations, Confounding Factors and Modularity

Although much has been written on this subject, there still seems to be considerable confusion in the literature concerning dissociations, double dissociations and what they really mean, especially when connectionist or neural network models are involved. In this paper I attempt to clarify matters by looking at the subject from the point of view of patterns of learning rates in neural network m...

Evidence of Double Dissociation in Auditory Agnosia: Implications for Rehabilition