Using coded videotapes of fifty-eight mother/infant pairs at infant ages of 2 1/2 , 5, 7 1/2 , and 22 months, the authors examined the complex process of emotional development. Their report identifies the features of expressive behavior and attempts correlation with maternal behavior and other factors. No index. Annotation(c) 2003 Book News, Inc. , Portland, OR (booknews. com)