Interest regarding neural information processing in autism is growing because atypical perceptual abilities are a characteristic feature of persons with autism. Central to our review is how characteristic perceptual abilities, referred to as "perceptual signatures," can be used to suggest a neural etiology that is specific to autism. We review…

The authors examined whether the perception of the university environment mediated the relationship between ethnic identity and persistence attitudes of Latino college students. Participants were 175 Latino college students who attended a primarily White university. The results supported the hypothesized mediating role of the university…

The basis for the category specific living things advantage in object recognition (i.e., faster and more accurate identification of living compared to nonliving things) was investigated in two experiments. It was hypothesised that the global shape of living things on average provides more information about their basic level identity than the…

Skill and risk taking are argued to be independent and to require different remedial programs. However, it is possible to contend that skill-based training could be associated with an increase, a decrease, or no change in risk-taking behavior. In 3 experiments, the authors examined the influence of a skill-based training program (hazard…

Psychostimulant exposure has been shown to cause molecular and cellular changes in prefrontal cortex. It has been hypothesized that these drug-induced changes might affect the operation of prefrontal-limbic circuits, disrupting their normal role in controlling behavior and thereby leading to compulsive drug-seeking. To test this hypothesis, we…

Perceptual invariance has been studied and found in several domains of cognition, including those of speech, motor behavior, and object motion. It has also been the topic of several studies in music perception. However, the existing perceptual studies present rather inconclusive evidence with regard to the perceptual invariance of expressive…

In written French, the acquisition of the nominal plural ("-s") occurs earlier and faster than the acquisition of the verbal plural ("-nt") (Totereau, Thevenin & Fayol, 1997, "Learning to Spell"). The reasons for this difference are not well known. The objective of the present research is to test two alternative hypotheses, which may provide an…

State and trait anxiety define different aspects of anxiety, and may represent environmentally and genetically mediated components of this phenotype. Furthermore their relationship, where trait anxiety is expressed through levels of state anxiety under threatening circumstances, may represent a process of interplay between a genetic vulnerability…

New multivariate permutation tests are proposed that may be effectively substituted for Hotelling's T-Square test in situations commonly arising in educational research. The new tests: (1) are distribution-free; (2) provide tests of directional as well as non-directional hypotheses; (3) may be tailored for sensitivity to specific treatment…

This paper begins by reviewing the results of research on the potential of adjunct questions for teaching both rote recall and intellectual skills, i.e., concept learning, problem solving, and rule learning. It is argued that greater understanding of what kinds of questions best support intellectual skills learning will promote effective…

A 2-to-the-kth-power mirror-image design is defined as one in which repeated observations of subjects occurs among the levels of a usual 2-to-the-kth-power design, but there is the restriction that no subject may receive a given level of any factor more than once. Such a restriction might arise, for example, if a subject's response is expected to…

This study tested Deiker's hypothesis that "naysaying" accounts for the Minnesota Multiphasic Personality Inventory Overcontrolled-Hostility (O-H) scale's ability to discriminate among criminal groups differing in their propensity for violence. It was concluded that the validity of the O-H scale is not dependent on naysaying. (Author)

Threedifferent statistical procedures for identifying aptitude-treatment interactions are discussed: (1) treatment x blocks analysis of variance (2) homogeneity of groups regressions and (3) extreme groups analysis. (Author)

Replication is important to viable scientific inquiry; results that will not replicate or generalize are of very limited value. Statistical significance enables the researcher to reject or not reject the null hypothesis according to the sample results obtained, but statistical significance does not indicate the probability that results will be…

This study of factors that block computer implementation in classrooms tested four hypotheses about the attitudes of preservice and inservice teachers toward scheduling arrangements and instructional use of computers in their classrooms. A semantic differential survey instrument was used to measure the attitudes of 36 Washington State University…