Age-related differences in short-term retention of separable elements of an odor aversion

The rate of forgetting over short intervals was tested in preweanling rats, 8, 12, or 18 days postnatal, using procedures that may have analytical advantages over other tests of short-term retention. Separate tests of retention were conducted for the simple occurrence of an odor and for the occurrence of an odor paired with a mild footshock. Forgetting of odors with either of two histories, incidental or target, was more rapid the younger the preweanling, over intervals of less than an hour. There was some indication of more rapid forgetting for incidental than target odors. Finally, although exposure to a CS- (an odor not paired with footshock) was necessary for conditioning of the CS+ (an odor paired with footshock) in rats 8 or 12 days of age, exposure to a CS- had no influence on conditioning of the CS+ in preweanlings 18 days of age. The age-related differences in forgetting over intervals less than an hour long suggest that substantial age-related differences in forgetting can occur that, it is likely, are not accounted for by differential growth.     

Visual laterality effects: A signal detection analysis

Subjects were asked to indicate, by a simple motor response, the presence or absence of a pre-designated target letter in unilaterally presented consonant trigrams. For horizontally oriented stimuli (Experiment 1), perceptual sensitivity was greater in the right visual hemifield. For vertically oriented stimuli (Experiment 2), perceptual sensitivity did not differ between visual hemifields. Decision making was less conservative and reaction time was shorter with right hemifield presentation, regardless of stimulus orientation. Practice effects and serial position curves were examined. Implications of these results attribute laterality effects to iconic scanning patterns and to postperceptual decision processes.     

Roles of the qualities and locations of stimuli and responses in simple associative learning

The Quality-Location Phenomenon is defined by the previous research of Lawicka (1964 and 1969) in which dogs easily learn go/no-go tasks to differences in stimulus quality and go-left/go-right tasks to differences in stimulus location whereas the opposite pairings of tasks and stimulus attributes are difficult to learn. The Lawicka-Konorski explanation in terms of drive differentiation and response selection is described, and a new hypothesis, the Quality-Location Hypothesis, is offered. This hypothesis states that the quality of a stimulus best serves as a cue for the quality of a response, whereas the location of a stimulus best serves as a cue for the location of a response. The evidence for the hypothesis is reviewed, and experimental considerations for its evaluation are mentioned.     

The role of performance-related similarity in social comparison of abilities: A test of the related attributes hypothesis

The hypothesis that individuals evaluate their abilities by comparison with others who are similar on nonability attributes that are related to performance has been supported in recent experiments. However, since these experiments did not include conditions in which attributes were unrelated to performance, they provide no evidence that it was the relationship of attributes to performance that explains why subjects compared with similar others. In the present experiment, 66 female undergraduates could choose to compare their test performance to the performance of women who were similar or dissimilar to themselves in physical attractiveness and the college they attended. In a 2 × 2 design these attributes were either related or unrelated to test performance. Results showed that only the performance relevance of college attended influenced comparison choices. Subjects compared with similarly attractive women even when attractiveness was unrelated to performance. These results indicate that identification of the conditions in which people do and do not consider the relevance of attributes to performance in selecting comparison others warrants attention.     

Identifying the speech codes

Models of speech processing typically assume that speech is represented by a succession of codes. In this paper we argue for the psychological validity of a prelexical (phonetic) code and for a postlexical (phonological) code. Whereas phonetic codes are computed directly from an analysis of input acoustic information, phonological codes are derived from information made available subsequent to the perception of higher order (word) units. The results of four experiments described here indicate that listeners can gain access to, or identify, entities at both of these levels. In these studies listeners were presented with sentences and were asked to respond when a particular word-initial target phoneme was detected (phoneme monitoring). In the first three experiments speed of lexical access was manipulated by varying the lexical status (word/nonword) or frequency (high/low) of a word in the critical sentences. Reaction times (RTs) to target phonemes were unaffected by these variables when the target phoneme was on the manipulated word. On the other hand, RTs were substantially affected when the target-bearing word was immediately after the manipulated word. These studies demonstrate that listeners can respond to the prelexical phonetic code. Experiment IV manipulated the transitional probability (high/low) of the target-bearing word and the comprehension test administered to subjects. The results suggest that listeners are more likely to respond to the postlexical phonological code when contextual constraints are present. The comprehension tests did not appear to affect the code to which listeners responded. A “Dual Code” hypothesis is presented to account for the reported findings. According to this hypothesis, listeners can respond to either the phonetic or the phonological code, and various factors (e.g., contextual constraints, memory load, clarity of the input speech signal) influence in predictable ways the code that will be responded to. The Dual Code hypothesis is also used to account for and integrate data gathered with other experimental tasks and to make predictions about the outcome of further studies.     

The cold glow of success: Responses to social rejection as affected by attitude similarity between the rejected and chosen individuals

Studied the effects of attitudinal similarity between two males on reactions to social rejection by a female. Sixty-five male undergraduate students had met an attitudinally similar or dissimilar male confederate. Later a female confederate either chose or did not choose the male confederate as a work partner. Following that, measures designed to tap subjects affective state and self evaluations were administered. Two way interactions for affect and self evaluations (p < 0.01 and p 7lt; 0.05 respectively) indicate that, relative to a control group, only subjects whose similar male partner was chosen expressed unfavorable affect and self-evaluations. The relevance of these findings for the affective consequences of social comparison processes is discussed.     

Dimensions of adolescent psychopathology

A factor-analytic study of parent ratings of 253 male and female adolescents between the ages of 13 and 17 referred for psychiatric and delinquent problems is reported. Parents rated their children on the Adolescent Form of the Louisville Behavior Checklist. One hundred thirty-seven items were intercorrelated and subjected to a principal component factor analysis and nine factors were rotated to varimax solution. The nine factors were named: Egocentric-Exploitive, Destructive-Assaultive, Social Delinquency, Academic Disability, Adolescent Turmoil, Apathetic Isolation, Neuroticism, Dependent-Inhibited, and Neurological or Psychotic Abnormality. A second-order analysis revealed two broad-band Internalizing and Externalizing dimensions. The factors were shown to be similar to but different from DSM III categories as well as from other factor-analytic studies of adolescents. This study indicates that much research will be required before a consensus can be reached on the basic dimensions of psychopathology of adolescence.     

Recommendations on experimentation with children: Some differences in Canadian and American approaches

Research on children raises major ethical issues, the most important being the inability of the subjects to provide freely given informed consent. Committees in Canada and the United States charged with formulating recommendations for the protection of human subjects in research came to some fundamentally different conclusions. Two of these are discussed as they apply to children: first the distinction between therapeutic and non-therapeutic research, recognized implicitly by the National Commission (U.S.A.) and deliberately avoided by the Medical Research Council Working Group (Canada); and second, the looser relation between local committees and Council as defined by guidelines in Canada and the tighter relation between the institutional review committees and the Department of Health, Education and Welfare defined by regulations in the United States.