Investigates the effect of the Verbal Rule Instruction Technique in facilitating the acquisition of conservation concepts. Data were collected from 247 Nigerian schoolchildren divided into three groups: verbal, nonverbal, and no-training. (Author/RH)

Tests the developmental memory lag hypothesis with 22 learning disabled boys on two- and three-dimensional nonverbal tasks. Finds age-equivalent recall patterns similar to those of normal children and consistent age-related differences in nonverbal recall, thereby negating the developmental lag hypothesis. (RL)

Finds significant differences for males and females on the "Mental Rotation Test" within and across trials, but does not show a differential response to training and practice by females, as was hypothesized. (RL)

The performance of 20 children with educable mental retardation (ages 8 to 12) and 20 verbal mental age-matched nonretarded controls was compared on identifying emotional facial expressions and producing the equivalent word adjectives. There were no significant differences between the two groups in general, despite the fact that children with…