An efficient procedure for selecting equal probability samples

FORTRAN code that implements an algorithm for selecting equal probability samples is given. The procedure is brief and decides to include or not include a record as it is called. Consequently, storage requirements are minimal. The procedure gives the exact number of values specified, with each record in the population having an equal probability for inclusion in the sample, including the last.     

The joint effect of forward and backward visual masking: Some comments on Uttal’s “Character in the hole” experiment

The joint effect of forward and backward visual masking appears to be more extended in time than that predicted from an algebraic summation of individual forward and backward masking effects. It is suggested that this apparent extension of the temporal range of masking arises from the summation of forward and backward masking effects which in themselves are insufficient to influence observed performance. Such latent masking effects are possible if it is not assumed that when stimulus identification reaches the 100% level the mask has no effect at all on the stimulus.     

Interpersonal Mediation of Perceived Crowding and Control in Residential Dyads and Triads

The role of interpersonal relationships in mediating the experience of crowding and loss of personal control was investigated in dormitory environments housing two or three students in bedroom units. A combination of survey, observational, and laboratory techniques was used to explore the formation of 2-person coalitions in tripled housing and subsequent problems created for the third, "left-out" roommate. Data strongly suggested that the aversiveness and loss of control previously associated with tripled residential settings may be more plausibly attributed to the inherent instability of 3-person groups and the loss of control associated with being excluded from group activities. In most of the tripled rooms studied, 2-person coalitions formed and most of the crowding and negative affect reported were expressed by the third roommate, who felt left out by the others. Residents of doubled rooms and members of coalitions in tripled rooms did not differ from one another on most dimensions.     

Imagery ability and the identification of hands: A chronometric analysis

In a replication of Cooper and Shepard's (1975) study of hand recognition, it was found that individual differences in imagery ability had a significant influence on reaction times to such stimuli (Experiment 1). However, it was found (Experiment 2) that individual difference effects were only seen if prior instructions to use imagery were given to the subjects.     

Violence and minority youth: the effects of risk and asset factors on fighting among African American children and adolescents

This cross-sectional study examined risk and asset factors thought to be associated with fighting among a sample of 1,642 African American children and adolescents in a central Alabama school district. Results show that poor grades, parental abuse, and gang affiliation were significant risk factors associated with higher frequency of fighting. Results also show that parental monitoring and being happy at school were associated with lower frequency of fighting, suggesting the importance of continued support for outreach to parents and further efforts to reduce or eliminate the community factors that promote proliferation of gangs. Programs, either for an entire community or a school system within a community, must be sensitive to the specific risks, assets, and outcomes of that environment so that prevention and intervention are sensitive to cultural, environmental, and demographic distinctions in target populations.     

Derived stimulus relations, semantic priming, and event-related potentials: testing a behavioral theory of semantic networks

Derived equivalence relations, it has been argued, provide a behavioral model of semantic or symbolic meaning in natural language, and thus equivalence relations should possess properties that are typically associated with semantic relations. The present study sought to test this basic postulate using semantic priming. Across three experiments, participants were trained and tested in two 4-member equivalence relations using word-like nonsense words. Participants also were exposed to a single- or two-word lexical decision task, and both direct (Experiment 1) and mediated (Experiments 2 and 3) priming effects for reaction times and event-related potentials were observed within but not across equivalence relations. The findings support the argument that derived equivalence relations provides a useful preliminary model of semantic relations.     

The Motivation Analysis Test: an historical and contemporary evaluation

This is an historical review and contemporary empirical evaluation of the Motivation Analysis Test (MAT), one of the first tests to take a psychometric approach to the assessment of motivation. Reviews were quite positive, but the test is now over 50 years old. Nevertheless, it employs innovations in measurement not widely used in objective measurement then or now: (1) subtests with different formats, (2) disguised items, (3) speeded administration procedures, and (4) ipsative format and scoring procedures. These issues are discussed and a contemporary sample (N = 360) obtained to evaluate the Motivation Analysis Test in light of its innovative characteristics.