Directions in Connectionist Research: Tractable Computations Without Syntactically Structured Representations

Metaphilosophy 28 (1‐2):31-62 (1997)
Abstract
Figure 1: A pr ototyp ical exa mple of a three-layer feed forward network, used by Plunkett and M archm an (1 991 ) to simulate learning the past-tense of En glish verbs. The inpu t units encode representations of the three phonemes of the present tense of the artificial words used in this simulation. Th e netwo rk is trained to produce a representation of the phonemes employed in the past tense form and the suffix (/d/, /ed/, or /t/) used on regular verbs. To run the network, each input unit is assigned an activation value o f 0 or 1 , dep ending on whethe r the featu re is present or not. Eac h input unit is conne cted to each of the 30 hidden units by a we ighted conn ection and p rovid es an inp ut to each hidden unit equal to the product of the input unit's activation and the weight. Each hidd en unit's activation is then determined by summing ov er the va lues co ming fro m each inp ut unit to deter mine a netinput, and then applying a non-linear function (e.g., the logistic function 1/(1+enetinput). Th is whole proced ure is.
Keywords Mind  Dynamics  Cognitive Science  Language of Thought  Foundations of Cognitive Science  Computation  Folk Psychology  Eliminativism  Cognition  Dynamical System  Connectionism  Neural Network  Connectionist Network
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