Who published what about whom?

Each study (n = 1,170) in the Journal of Personality Assessment and its predecessor (1968 through 1982) was reviewed to determine the affiliation of authors, personality measures commonly used, type of study methodologies employed, and characteristics of subjects studied. Generally, there were no large trends or shifts in any of these across the 15-year survey period. The Rorschach continues to be a common subject for study, as does the MMPI; authors have typically been from academic rather than applied settings; validity and normative studies have been most common; and the most frequently used subjects have been college students. Objective tests have increased in frequency in JPA articles, while projectives, except for the Rorschach, have declined; and the majority of research subjects have been drawn from nonpathological populations. Implications for editorial policies and reader interest are discussed.     

Language and reasoning: a study of temporal factors

The paper is concerned with the testing of psycholinguistic hypotheses by the use of deductive reasoning tasks. After reviewing some of the problems of interpretation which have arisen with particular reference to conditional rules, an experiment is presented which measures comprehension and verification latencies in addition to response frequencies in a truth table evaluation task.The experiment tests a psycholinguistic hypothesis concerning the different usage of the logically equivalent forms of sentence: If p then q and p only if q with respect to the temporal order of the events p and q. It is proposed that the former sentence is more natural when the event p precedes the event q in time, and the latter more natural when the opposite temporal relation holds.Although significant support is found for the hypothesis in the analysis of the latency data, it is only distinguished from an alternative explanation by detailed analysis of response frequencies, thus indicating the general usefulness of the paradigm adopted.     

A PDP-12 system for on-line acquisition of heart rate data

A research program for investigating the responsiveness of infants at high risk for developing schizophrenia is described briefly. Two measures of reactivity to brief auditory stimuli, the evoked heart-rate response and the evoked potential of the brain, are recorded for analysis by the PDP-12 computer. An interface to the PDP-12, called the R peak detector and R-R interval counter, is used for reducing the EKG to R-R intervals, with an accuracy of ± 1 msec. The current usage of the PDP-12 and its IBM-compatible tape transports is discussed, and proposed developments for on-line statistical analyses of the physiological data and real-time control of the experiment are presented.     

The effects of formal and acoustic repetition in the Brown-Peterson paradigm

On a given trial in the Peterson and Peterson paradigm, the trigram B, K, T was presented. For one group this same trigram had been presented three trials earlier (exact repetition). For another group the critical item which had preceded the consonant trigram was BEE, KAY, TEA (homophonic repetition). Both groups showed a repetition facilitation significant beyond that of the appropriate control groups. The exact repetition group excelled the homophonic repetition group. Postexperimental questionnaires on awareness of the experimental manipulation did not precisely clarify the results obtained. The data support the view of multiple encoding.     

The analysis of categorizing behavior

Latent partition analysis enables an examination of the modal population categorizations of a set of items. The initial model proposed by Wiley is reformulated, extended and generalized. Firstly, the effects of judges are regarded as random, rather than fixed. In a second model, several latent partitions, rather than one, are allowed, resulting in a type of multidimensional approach. Finally, both the single and multiple partition models are shown to be specializations of a less restrictive model, called the category focusing model. In each of these three cases, properties implicit in the model are used to derive appropriate solution procedures. Measures of individual differences are considered, and the application of the procedure to experimental work in concept formation is discussed. Several sets of data are used to demonstrate the characteristics of the techniques evolved. This project was commenced while the author was on the staff of the University of Queensland.