The effects of isolation and handling on reactivity to footshock and tactile dorsal stimulation

The effects of isolation and handling on the reactivity of rats to two tactile stimuli were assessed in two experiments. In the first experiment, reactivity to more intense footshock was increased in rats raised in isolation but was not affected by handling by an experimenter. In the second experiment, increased reactivity to airpuff stimuli presented to the dorsal surface of isolation-reared rats was reduced by handling. The data suggest that the effects of handling on shock-motivated behaviors are not due to altered reactivity to shock and that the effect of housing or handling must be considered in behavioral tests in which reactivity to tactile stimulation might play a role as dependent or independent variables.     

Games and simulations: Creative educational alternatives

Summary Active participation is the foundation of learning through the media of games and simulations. The actual doing by the students is the important element. Games and simulations, if properly designed and applied, can meet a variety of classroom objectives. A vast array of educational games and simulations has been designed and many are available commercially. However, a skilled and innovative instructor can apply certain guidelines to custom design activities for the individual classroom. Involving students in the design and modification of games and simulations is recommended.     

Progress monitoring with objective measures of writing performance for students with mild disabilities

To adequately monitor progress in writing, a test must show stability and demonstrate a performance profile over time that parallels those of accepted criterion measures. This study investigated the technical adequacy of seven objective indexes of writing quality in monitoring the progress of 36 middle school (Grades 6-8) students with mild disabilities over a 6-month period. The stability of each index was assessed. Holistic ratings of the same writing samples and the Test of Written Language served as validation criteria. Three indexes were moderately correlated with holistic ratings, but were not sufficiently stable over time. Direct, objective writing assessment must be used with caution for progress monitoring, given our present lack of precision in measuring the complex task of writing.     

From natural numbers to numbers and curves in nature —I

The interconnection between number theory, algebra, geometry and calculus is shown through Fibonacci sequence, golden section and logarithmic spiral. In this two-part article, we discuss how simple growth models based on these entities may be used to explain numbers and curves abundantly found in nature     

An empirical taxonomy of youths' fears: Cluster analysis of the American fear survey schedule

Fears profiles among children and adolescents were explored using the Fear Survey Schedule for Children‐American version (FSSC‐AM; J.J. Burnham, 1995, 2005). Eight cluster profiles were identified via multistage Euclidean grouping and supported by homogeneity coefficients and replication. Four clusters reflected overall level of fears (i.e., very low, below average, moderate, and multiple), and four others exhibited specific peaks associated with school‐related fears, medical fears, and scary things. Demographic characteristics associated with cluster profile membership revealed variability primarily based on gender and age, with some differences associated with community type. Comparisons with prior results on earlier fear surveys and implications for school refusal behavior provide a useful context for discussion. © 2006 Wiley Periodicals, Inc. Psychol Schs 43: 673–683, 2006.     

Are there constraints on learned responses to odors from rewarded and nonrewarded rats?

This study determined if test rats could utilize biological odors, generated from donor rats receiving reward (R) and frustrative nonreward (N) treatments, to predict reward and nonreward goal events equally well. In Phase 1, two groups of test rats were exposed to R and N odors that signaled, respectively, either R and N goal events (“same” condition) or N and R goal events (“opposite” condition). Rats demonstrated significant discriminative use of these odors under both conditions. Subjects in the “opposite” condition, however, were slightly slower to learn the discrimination. Reversal learning was readily accomplished in Phase 2, regardless of the same-opposite factor. Thus, little evidence for a constraint on learning was found, and an interpretation in terms of interfering response tendencies and their habituation seemed favored.