Hypothesized that there would be no significant sex differences in the performance of conservation tasks on substance or volume, among 247 Ibo-speaking Nigerian children. Attributed confirmation of the hypothesis to social change and greater sexual equality in this developing society. (GC)

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)

The study compared the performance of 30 blind Chinese children in Taiwan, 34 blind Indian children, and 40 sighted Chinese children on 8 conservation tasks. Although both groups of blind children performed considerably poorer than sighted children, those blind children with considerable experience handling tangible materials performed better than…

This study investigates the effects of a training procedure on children's conservation. Volume conservation was induced in twenty-one 8-year-old non-conserving children by a procedure that combined two sources of conflict. First, the competing schemes used in making decisions on volumes were aroused; second, the non-conserver was made aware of a…

The study compared the conservation abilities of 80 prelingually deaf and 80 hearing students (ages 9-12) in the Republic of China. Results indicated a significant difference in conservation ability between groups favoring the hearing students and no significant difference in conservation ability between age levels for the deaf group. (DB)

Among results comparing attainment of the conservation concept in blind (N=30), partially sighted (N=50), and sighted (N=40) children (ages 6-15) in Taiwan were that development of partially sighted children was more like the development of sighted than blind children, and that a 1-4 year developmental lag occurred in blind children. (Author/DB)

Explores how the apparent loss of energy in inelastic collisions may be understood by considering a simple model of two rigid balls connected by a spring. Includes a numerical simulation of this and an extension to include Newton's Cradle. (DDR)

This study investigated the effect of different implicit definitions of equality upon children's performance on conservation tasks. In the study, traditional versions of conservation tasks are compared to modified versions in which initial equality is established through verbal counting of discontinuous quantities and measuring of continuous…

Investigated the role of schooling and urbanization on the acquisition of conservation of physical quantities in 384 Senagalese children of 7, 9, 11, and 13 years. Results revealed functional divergences in the acquisition of physical quantities. (RJC)

We describe an iteratively designed sequence of activities involving the modelling of one-dimensional collisions between moving objects based on programming in ToonTalk. Students aged 13-14 years in two settings (London and Cyprus) investigated a number of collision situations, classified into six classes based on the relative velocities and…

Sinclair-de Zwart's findings on relationships between cognitive and linguistic development were compared with data gathered in Australia from 162 first-, second-, and third-grade Greek-English bilinguals (tested in both languages) and 136 English monoglots in the same classroom. (Author/CS)

Investigates which aspects of the mother behavior in interaction would be related, and in what way, to the child's acquisition of number conservation as a criterion measure of later cognitive development. (MP)

Two studies indicate that Oksapmin children progress from premediational to mediational phases in their use of body parts to compare and reproduce number and that this change generally occurs prior to the development of concepts of number conservation. A third study shows that this general change is manifested in culturally specific ways.…

A former editor of this journal, 1967-69, selects an outstanding article from her tenure for its significance as the beginning of important studies in mathematics learning in young children. The article selected presents a modified technique for assessing a young child's acquisition of length conservation while eliminating or reducing the…

Nonretarded (NR) and educable mentally retarded (EMR) 6- to 19-year-old children in Istanbul, Turkey, completed conservation tasks. Found a similarity in the developmental progression of conservation concepts between the two groups and between these groups and groups of NR and EMR children in England as reported in previous studies. (BC)