Representations of Self and Other: A Semantic Space Model

ABSTRACT This article describes a semantic space model of personality. According to the model, representations of facets of the self (e.g., actual self, self) and of others are arrayed in a semantic space, with proximities among representations predicted to be associated with mood, self-evaluation, broad personality dimensions. The relation of proximities among pairs of representations to personality and mood measures was found to be mediated by spatial proximity of other representations, indicating that the representations constitute dynamic systems. Proximities among representations were shown predict self-esteem and self-evaluative moods even after controlling for the contribution of the personality dimensions of Neuroticism, Extraversion, and Agreeableness. Generally, the semantic space model led to better predictions did several related models concerning representations of self and other.     

Incomplete taste adaptation to different concentrations of salt and sugar solutions

Two concentrations each of sodium chloride and sucrose solutions were used as stimuli in a study examining taste adaptation. Twenty subjects were presented a 3-min continuous flow of each taste stimulus over the anterior dorsal tongue surface, and periodically gave magnitude estimates of its intensity. The degree of adaptation was greater for the less concentrated solutions than for the more concentrated ones, but the majority of subjects did not adapt completely to any of the stimuli. This result, which is consistent with other reports from this laboratory, is discussed in terms of individual differences among subjects and in relation to recent taste research based on completely adapted subjects.     

From steroids to nation states: An integrated evolutionary approach to violent crime

Most evolutionary psychologists emphasize the individual level of analysis concerning violent crime and other dependent variables. This paper outlines a strategy for evolutionary explanation of societal variation across time as well as space and applies it to crimes of violence. The central idea is that individual adaptations for reproductive competition play out differently depending both on developmental context and societal conditions, including the marriage market. Violent crimes (murders, rapes, and assaults) are substantially higher in countries with a relative scarcity of men according to research using INTERPOL and World Health Organization data [Barber, N. (2000a). The sex ratio as a predictor of cross-national variation in violent crime. Cross-Cultural Research, 34, 264–282, Barber, N. (2009). Countries with fewer males have more violent crime: Marriage markets and mating aggression. Aggressive Behavior, 35, 49–56]. This is an apparent contradiction given that males are more criminally violent and likely reflects increased direct mating competition that evokes increased testosterone production for humans as for other species. The empirical evidence is discussed in terms of direct reproductive competition and various alternative explanations, particularly the “culture of violence” and socialization experiences are considered.     

Pharmacological dissociation of trace and long-delay fear conditioning in young rats

In most studies comparing trace and delay conditioning, CS duration is kept constant across training conditions but the interstimulus interval (ISI), the time from CS onset to US onset, is confounded. In the infrequently used long-delay condition, however, ISI is kept constant across the trace and delay conditions but CS duration varies. A recent study reported that trace and long-delay fear conditioning have the same developmental trajectory, with both emerging later in development than standard-delay conditioning (). Past studies have shown that trace conditioning is mediated by the cholinergic system; given the parallel developmental emergence of trace and long-delay conditioning, the present study examined whether the cholinergic system also mediates long-delay conditioning. Two experiments, both involving Sprague-Dawley-derived rats and using freezing as a measure of learned fear, showed that the cholinergic system is critically involved in trace conditioning but is not involved in long-delay conditioning. Specifically, pre-training injections of the muscarinic receptor antagonist scopolamine impaired acquisition of a CS-US association in 32-day-old rats trained with a trace procedure but had no effect on rats this age trained with a long-delay procedure (Experiment 1). Similarly, pre-training injections of physostigmine, a cholinesterase inhibitor, enhanced acquisition of trace conditioning in 25-day-old rats but had no effect on long-delay conditioning in rats this age (Experiment 2). Taken together, the results indicate that despite the similarities between trace and long-delay conditioning in terms of developmental emergence and level of conditioned responding, they are mediated by different physiological systems.     

Depictions of acne and psoriasis influence interpersonal aversion

The presence of a dermatological condition may deter contact with the affected person because it falsely signals the threat of infection. The current study investigated interpersonal aversion towards individuals with the appearance of acne and psoriasis. Participants (N = 196) either viewed a female face with the appearance of acne, psoriasis, or no visible dermatological condition. Participants rated the attractiveness of the person, and indicated their willingness for social and indirect contact with them. The person depicted with acne was rated significantly less attractive than the person with psoriasis or no dermatological condition. Participants reported significantly less willingness for indirect contact with the person depicted with acne or psoriasis compared to the person with no visible dermatological condition. In contrast, participants expressed more willingness for social contact with a person with acne than with the person with psoriasis or no dermatological condition. Group differences were significant when controlling for attractiveness ratings. Unwarranted fear of infection might underpin avoidance and discriminatory behaviour towards those with skin conditions. Further research is required to understand factors that influence avoidance of contact.     

The impact of discredited evidence

How do people revise their beliefs when evidence is discredited? In three studies, mock jurors read simplified criminal cases and then judged the probability that a suspect was guilty on the basis of sequentially presented evidence. Study 1 showed an extension effect: When two items of incriminating evidence were presented, a subsequent discrediting of the second item also lessened belief in the first item, irrespective of whether it was directly related to the discredited item. Study 2 showed that this effect depended on the order of evidence presentation: When the discrediting evidence was presented early, rather than late, in the sequence, there was no extension to unrelated items. Study 3 showed that the extension effect held only when items of evidence were both incriminating or both exonerating, but not when they were mixed. To explain these findings, we draw on coherence-based models of juror reasoning and propose that people group evidence according to its direction with respect to the guilt hypothesis.