Chapter headings: Introduction (N. Raz). Developmental Instability and Phenotypic Variation in Neural Organization (R.A. Yeo, S.W. Gangestad). Animal Models of Developmental Dyslexia: Lessons from Developmental and Cognitive Neuroscience (G.D. Rosen). Electrophysiological Correlates of Early Speech Perception and Language Development During Infancy and Early Childhood (D.L. Molfese). Developmental and Individual Differences in Short-term Memory (J.S. Saults, N. Cowan). Lifespan Studies of Mental Chronometry: Insights Derived from Chronopsychophysiology (T.R. Bashore et al.). Differential Contribution of Frontal and Medial Temporal Lobes to Memory: Evidence from Focal Lesions and Normal Aging (E.L. Glisky). Does Working Memory Work in Language Comprehension? Evidence from Behavioral Neuroscience (A. Wingfield et al.). Problem Solving, Inhibition, and Frontal Lobe Function (J. Dorfman).