List of contributors. Acknowledgements. Introduction: Understanding brain and cognitive disorders: the computational perspective (E. Ruppin, J.A. Reggia, D.L. Glanzman).I. Memory Disorders.1. Neuromodulation and the hippocampus: memory function and dysfunction in a network simulation (M.E. Hasselmo).2. Cholinergic neuromodulation and Alzheimer's disease: from single cells to network simulations (E.D. Menschik, L.H. Finkel).3. Episodic memory in semantic dementia: a computational approach based on the TraceLink model (K.S. Graham, J.M.J. Murre, J.R. Hodges).4. Multimodular networks and semantic memory impairments (D. Horn, N. Levy, E. Ruppin).II. Neuropsychology.5. Understanding failures of learning: Hebbian learning, competition for representational space, and some preliminary experimental data (J.L. McClelland, A. Thomas, B.D. McCandliss, J.A. Fiez).6. Frames of reference in hemineglect: a computational approach (A. Pouget, S. Deneve, T.J. Sejnowski).7. Explaining object-based deficits in unilateral neglect without object-based frames of reference (M.C. Mozer). 8. Inter-hemispheric competition of sub-cortical structures is a crucial mechanism in paradoxical lesion effects and spatial neglect (C.-C. Hilgetag, R. Kötter, M.P. Young)9. A new model of letter string encoding: simulating right neglect dyslexia (C. Whitney, R.S. Berndt).10. Prosopagnosia in modular neural network models (M.N. Dailey, G.W. Cottrell).11. Functional brain imaging and modeling of brain disorders (M.A. Tagamets, B. Horwitz).III. Neurology.12. Unmasking unmasked: neural dynamics following stroke (W.W. Lytton, S.T. Williams, S.J. Sober).13. Effects of callosal lesions in a computational model of single-word reading (J. Chhabra, M. Glezer, Y. Shkuro, S.D. Gittens, J.A. Reggia).14. Penumbral tissue damage following acute stroke: a computational investigation (E. Ruppin, K. Revett, E. Ofer, S. Goodall, J.A. Reggia)15. The gating functions of the basal ganglia in movement control (J.L. Contreras-Vidal).16. Motor fluctuations in Parkinson's disease: a postsynaptic mechanism derived from a striatal model (R. Kötter).17. Thalamic and thalamocortical mechanisms underlying 3 Hz spike-and-wave discharges (A. Destexhe, D.A. McCormick, T.J. Sejnowski).IV. Psychiatry.18. Using a speech perception neural network simulation to explore normal neurodevelopment and hallucinated "voices" in schizophrenia (R.E. Hoffman, T.H. McGlashan).19. Dopamine, cognitive control, and schizophrenia: the gating model (T. Braver, J. Cohen).20. Modeling prefrontal cortex delay cells: the role of dopamine in schizophrenia (A. Reid, D. Willshaw).21. Neural models of normal and abnormal behavior: what do schizophrenia, parkinsonism, attention deficit disorder, and depression have in common? (S. Grossberg).22. A neural network model of attention biases in depression (G.J. Siegle).Subject Index.