This paper reports on a 14-year follow-up study of two developmentally retarded Japanese children, a brother and sister, who had been kept shut up in a small shack before being rescued (at ages 5 and 6 respectively). Following birth they consistently suffered malnutrition, maternal deprivation, social isolation from adults, language deprivation, and cultural deprivation. However, there were almost no sensory-motor limitations and interactions between the children and their elder siblings were available to some extent. At the time of rescue, their heights and weights corresponded to those of an average 1-year-old and they were incapable of walking unaided. The research team designed special remedial programs for language, cognitive, socio-emotional, and motor development. After 3 years, their heights and motor skills caught up with standard levels. Remarkable early recoveries were observed in IQ development, but they soon stagnated at the 70-80 level. They performed poorly in complicated linguistic problem solving. In socio-emotional development, the girl developed a strong attachment to the nurse in charge, but the boy developed shallow attachments to everyone equally at first and had more behavioral problems as he grew older. Results suggest that sensory-motor ability and linguistic-logical ability are different and independent in their origins. (VW)