Critical incidents for psychology students in a refugee camp: Implications for counselling

Malawi is host to over one million refugees from the Mozambican war. Although there are no recognized positions for professional counsellors in Malawi, the need for counselling war affected refugees has been recognized. The experience of two psychology students who worked with war affected children is investigated, using the technique of Critical Incidents Analysis. Key characteristics of this work are identified as a means to creating a training curriculum to prepare students for future placement in refugee camps.     

Comparison of behaviors of suspected sexually abused and nonsexually abused preschool children using anatomical dolls

Using anatomical dolls, the play behaviors of nine sexually abused preschool children (five males, four females), ranging in age from 3 to 5 years, were compared with nine preschool children for whom there was no suspicion of sexual abuse and who were matched on the basis of age, gender, race, family status, and socioeconomic status. There was no significant difference between the two groups on explicit sexual behavior (vaginal, oral, and anal intercourse with thrusting motions between the dolls or between the child and the dolls and masturbation by the child). The groups were significantly [t(8)=2.19, p <.05; Wilcoxon W=6, p <.05) different when behaviors with suspicious sexual implication were combined with explicit sexual behaviors. There were no differences between the groups on measures of nonsexual behavior. The occurrence of the suspicious sexual behaviors is discussed and reviews of previous doll research and physical evidence of child sexual abuse are provided.This project was supported in part by a grant from The Graduate College of Western Michigan University, Kalamazoo, Michigan.     

Concerning the determination of trait variability

An analytic technique for the study of trait variability is presented. An expression for the average variance from test to test and an expression for the variance of these variances are derived in terms of the number of tests and the intercorrelations between them, and limiting cases are examined. The question of the true relationship between the nature of the distribution of test scores in a sample ofN persons and the nature of the distribution ofn traits in a single individual is discussed, and other problems are introduced.     

FIT: An iterative parameter-estimation function in LISP

A nested parameter-estimation program (FIT), written in LISP, is described. FIT searches an n-dimensional parameter space for the set of parameter values associated with either a minimum or a maximum criterion score. The range of the parameters is cut in half on each iteration. Two versions of FIT, one suitable for use on large, mainframe systems and the other designed for small microprocessors, appear in the appendices.     

Human spatial orientation in the pitch dimension

Two experiments were conducted. In Experiment I, each of eight Ss attempted to place himself at 13 different goal orientations between prone and supine. Deviations of achieved body pitch angles from goal orientations were determined. In Experiment II, each of eight Ss attempted to align a visual target with his morphological horizon while he was placed at each of the 13 goal orientations. Changes in settings of the target were examined. Results indicate that Ss underestimate body pitch when they are tilted less than 60 deg backward or forward from the vertical, overestimate body pitch when they are nearly prone, and accurately estimate body pitch when they are nearly supine. In contrast, Ss set the visual target maximally above the morphological horizon when they are tilted 30 deg forward from the vertical. The findings are discussed in terms of common and different physiological mechanisms that may underlie judgments of these types.     

Directional information and apparent movement

The number of alternative directions that a point of light can take in the apparent movement produced by the successive exposure of two points of light may be considered its directional information. The present experiment is concerned with the relationship between such directional information and the threshold between apparent movement and apparent successiveness, the original hypothesis being that the greater the directional information, the higher the threshold of movement. In fact, contrary results were obtained. Thresholds were obtained under conditions where movement could occur in either eight directions or only in two directions, better and more persistent movement being found under the former conditions. But this result is obtained only when one measures thresholds by an ascending method: increasing the time separation between light points from optimal movement to successiveness. An hypothesis is proposed to explain the findings stated in terms of “attentional disarticulation”.     

Distance discrimination in a simulated space environment

The just noticeable difference (JND) for distance was investigated by a paired-comparisons method using successive comparisons. The research utilized an optically simulated large target located in a textureless environment at distances along the saggital plane out to 12, 800 ft. The value of ΔD/D varied from less than 3% at 200 ft to about 7% at 12, 800 ft. The results confirmed a power function relationship between distance threshold and observation distance.     

Identifying rotated letter-like symbols

Previous research has shown that the identification of rotated alphanumeric symbols seems to be performed via the extraction of critical features encoded invariant to the symbol’s orientation. The present research argued that the use of such feature extraction processes might be a function of, first, a subject’s familiarity with the symbols, and second, the number of symbols from which a presented symbol is sampled. Earlier research has used highly over learned alphanumerics, in sets of six symbols; this practice is argued here as being seemingly conducive to feature extraction. In two experiments, the generality of a feature extraction interpretation, in contrast to one of mental rotation, was tested by having subjects previously trained to relative high- vs. low-familiarity criteria identify novel symbols in conditions in which a presented symbol was 1 of either 5 or 20 possibilities. Identification response times were found to be constant across all nonstandard orientations of presented symbols, irrespective of symbol familiarity or symbol set size. The findings support the generalization of a feature extraction interpretation to varying numbers of novel symbols of varying familiarity.