Describes two experiments conducted to explain why retarded children of younger mental age appear to be more selective on discrimination tasks containing relevant redundant cues than do children of older mental age. Findings are consistent with the hypothesis that the latter group of children are overselective because they tend to solve…

According to Hypothesis (H) theory, learning should be very difficult when the number of Hs the subject samples from is very large and/or the correct H is not available. These assumptions were tested with third- and fourth-grade children. In general, results supported these assumptions. (Author/MP)

A nonverbal paradigm for assessing conservation based on an operant discrimination learning procedure is described. Initial results suggest that young children who could not conserve within the traditional verbal procedure were more likely to demonstrate conservation within the nonverbal paradigm and that traditional Piagetian tasks are verbally…

Three studies of elementary school children's problem-solving procedures in intentional discrimination tasks are reported. Subjects were children selected from kindergarten and grades 2, 3, and 6. (Author/MP)

A sorting task was used to define concepts held by 120 children (4, 5, and 18 years old) as available and nonavailable. These concepts were then used at the appropriate age levels in a discrimination-learning task. After learning the discrimination, either a reversal or half-reversal shift was required. (MS)

This study examined the matching and sequencing of quantities, numerals, and arbitrary forms by two individuals with mental retardation. Results showed that sequence training did not readily lead to new matching performances, unlike prior research with college students. Instead, training in matching to sample yielded emergent sequence production…

Examined the ability of bilingual college students from Catalonia, Spain to learn a new vowel contrast as indicated by classifying the vowel, discriminating two vowels, and judging its "category-goodness." Found a lack of behavioral plasticity and that early, extensive exposure to a second language was sufficient to attain the…

Three experiments investigated 4-, 6-, and 8-month-olds' perception of the audible, visible, and combined attributes of bimodally specified syllables. Results suggested that at 4 months, infants attended primarily to the featural information, at 6 months primarily to the asynchrony, and at 8 months to both features independently. (Author/KB)

This brief report attempts to resolve the claim that infants preferentially attend to continuous variables over number [e.g. Psychol. Sci. 10 (1999) 408; Cognit. Psychol.44 (2002) 33] with the finding that when continuous variables are controlled, infants as young as 6-months of age discriminate large numerical values [e.g. Psychol. Sci. 14 (2003)…

The present study was aimed at simultaneously determining on the same subject, the effects of stress on retrieval of flexible (contextual or temporal) or stable (spatial) information. Three behavioral paradigms carried out in a four-hole board were designed as follows: (1) Simple Discrimination (SD), in which mice learned a single discrimination;…

This paper considers the unique and successful combination of using Direct Instruction programs with special education populations. The introduction establishes the need for valid, scientifically based materials. Next is a description of studies using Direct Instruction with students who have high-incidence disabilities. Thirty-seven studies were…

Reproduction training improved performance only on the reproduction test; discrimination training improved performance only on the discrimination test. The effects of discrimination were seen both on forms used in training and on other similar forms, while the effects of reproduction training were seen only on trained forms. (Author/BJG)

This study investigated the effects of two stimulus manipulations (spatial distinctness and number of dimensions) on the performance of 24 kindergartners and 24 fifth graders in (1) tasks requiring distributed attention and (2) tasks requiring selective attention. Results suggest that kindergartners attempt to use one processing mode (distributed…