The computational modelling of sensitive periods

Typesetting note: We have used Greek symbols in the text but we have found these sometimes do not appear if the document is opened on a computer loaded with different fonts. The symbols are Δ (upper case delta) and ε (epsilon). These symbols appear on p.3, paragraph 4, line 2 (below equation 1): " where a i is the activation of the sending unit and a j is the activation of the receiving unit, w ij is the connection strength between them, [uppercase delta] is the change in this strength, and [epsilon] is the 'learning rate parameter' (see, e.g., O'Reilly and Munakata, 2000, equation 4.2). " 2

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