Anticipatory contrast as a measure of time horizons in the rat: Some methodological determinants

In three experiments, the time horizon over which the rat evaluates alternative feeding sources was investigated. The time horizon was measured by the suppression of intake of one incentive (a 0.15% saccharin solution) when a preferred alternative incentive (a 32% sucrose solution) was available but delayed. In Experiment 1, we found a direct function between the amount of saccharin intake and the delay time before access to 32% sucrose. Compared with intake for a saccharin-only control, saccharin intake was suppressed before 4-min and 16-min sucrose delays, but not before a 32-min delay. Because previous work (Flaherty & Checke, 1982) had reported suppression before a delay of nearly 32 min, in the subsequent experiments we examined factors that might account for this difference. In Experiment 2, we found that saccharin intake was suppressed before a 32-min delay interval when saccharin and sucrose solutions were presented in a bright-novel test environment but not when the same solutions were presented in the home cage. In Experiment 3, we found that the time between testing and subsequent postsession feeding could also affect the suppression of saccharin intake. Saccharin intake was suppressed when access to 32% sucrose was delayed by 32 min and the test situation was followed by immediate postsession feeding, but not when postsession feeding was delayed by 90 min. These results thus extend estimates of the rat’s time horizon to at least 32 min, but indicate that the effective time horizon can vary, depending on the test situation.     

Auditory perceptual processing in reading disabled children

One hundred and three children attending Learning Assistance Centres due to reading difficulties and one hundred and three matched, average readers were administered a battery of auditory perceptual processing tasks. The battery was composed of auditory analysis and synthesis, auditory sequential memory, auditory discrimination, and phonemic segmentation tasks. A principal components analysis yielded four factors. These were determined to be advanced phonological awareness, sequential memory, discrimination, and simple phonological awareness. Discriminant analyses, using the factor scores, indicated that three of the four factors were able to discriminate between the able and disabled readers. Most notable among these was advanced phonological awareness. Auditory discrimination could not discriminate between the groups. The results suggest that there may not be one underlying phonological ability implicated in successful reading acquisition. Furthermore, it is clear that two levels of phonological awareness exist and that screening and diagnostic instruments should address both in order to have predictive validity.     

Putting the “Is for” Back into the Study of Cognition and Behavior: Commentary on “Unifying Themes for Educational Psychology”

Understanding human behavior situated in a classroom context has traditionally been the domain of educational psychology. This rich tradition continues today, but in a fragmented manner. This fragmentation is undoubtedly the result of a number of factors, but two contributing factors that come readily to mind are (a) the demise of grand theories and (b) the increase in multidisciplinary research efforts. In some respects, the former may be a function of the latter. Regardless, multidisciplinary efforts will continue to increase simply due to the complexity of the problems we are addressing. However, the major significance of the Dempster and Corkill paper is the call for unifying themes couched within a biological system that focuses on personal knowledge construction through the process of learning. In many respects this is a clarion call for a reconsideration of the theoretical roots of functionalism from which educational psychology sprang.     

Ordinal position in the serial learning of rats

Rats were runway trained on each of two, three-trial series consisting of different varieties of reward (X, Y, and Z) and nonreward (N) serving as trial outcomes. The two series are represented as XNY and ZNN. Distinguishing the two series were different brightness and texture cues on the runway floor. Transfer tests, conducted after the rats had developed faster running for rewarded trials than for nonrewarded trials and slower running on Trial 2 of ZNN than on Trial 2 of XNY, provided evidence that trial position, rather than item memories, was controlling the discriminations. In Experiment 1, reversing the floor cues completely reversed the discriminations. In Experiment 2, transfer to NNN did not change the routine patterns of approach that had been established.     

The course as token: A construction of/by networks

In actor-network theory (ANT) the movement from the instability of science-in-the-making to the relative stability of ready-made-science is followed by tracing the path of a token or focal actor (either human or non-human) as it both constructs a network and is simultaneously transformed by the developing network. Within science education, a new course can be seen to be a token. It undergoes various transformations as it simultaneously changes those who encounter it (teachers, students, and interested actors beyond the school) and is changed by those same actors. This paper describes the way a new applied physics course introduced in British Columbia as part of a program in applied academics can be seen to construct different networks in different contexts and, in the process, to take on significantly different characteristics. Data are collected from interviews and observations in two different settings characterized in part by differences in the types of partnerships developed with industry, labour, and post-secondary groups. The success of the applied physics course in challenging traditional forms of school physics is seen to rely on the size and strength of the network in which it is imbedded.     

Expressive Vocabulary Predicts Nonverbal Executive Function: A 2-year Longitudinal Study of Deaf and Hearing Children

Numerous studies suggest an association between language and executive function (EF), but evidence of a developmental relationship remains inconclusive. Data were collected from 75 deaf/hard-of-hearing (DHH) children and 82 hearing age-matched controls. Children were 6–11 years old at first time of testing and completed a battery of nonverbal EF tasks and a test of expressive vocabulary. These tasks were completed again 2 years later. Both groups improved their scores on all tasks over this period. DHH children performed significantly less well than hearing peers on some EF tasks and the vocabulary test at both time points. Cross-lagged panel models showed that vocabulary at Time 1 predicted change in EF scores for both DHH and hearing children but not the reverse.     

Using Panel Data to Identify the Effects of Institutional Characteristics,Cohort Characteristics,and Institutional Actions on Graduation Rates

Research in Higher Education - Institutional graduation rates occupy a prominent place in institutional research and public policy. Graduation rates are used in the College Scorecard, state...