CS duration,amount, and concentration effects in conditioning taste aversions

The relative contributions of the duration, amount, and concentration of a taste CS were assessed in pairings with an ionizing radiation US in two experiments. Increasing the duration of the CS (0.1% saccharin) up to 9 min yielded increasingly better conditioning over a $\text{1}\text{2}\text{-}\text{hr}$ CS-US delay interval. When the concentration of the sacharin was increased, only a few seconds' exposure to the CS was necessary for near asymptotic conditioning. It was observed that the CS duration effect had not been identified earlier because most investigators utilize 10–20 min CS access periods. The role of CS duration in conditioning over a delay was discussed with reference to the probability of the memory of the CS being present at the time of the pairing with the US event.     

Effect of CS-US pairings on shock-elicited aggression as a function of US intensity

In two experiments with paired rats, the effect of superimposing CS-US pairings on a baseline of shock-elicited aggression was studied. Baseline shocks (3.0 mA, 0.125-sec duration) occurred at a rate of 20 shocks per min throughout each session. In Experiment I, each independent group of two pairs of subjects received (in addition to baseline shocks) US shocks of 1.0, 3.0, or 5.0 mA and 5-sec duration, each shock signalled by a 1-min CS. At all three US intensities, aggression increased during the CS. In Experiment II, pairs of subjects received each unconditioned stimulus intensity in a within-subjects design. This procedure revealed a direct relationship between rate of responding and unconditioned shock intensity.     

I can see myself helping: The effect of self-awareness on prosocial behaviour

Many studies indicate that increasing self-awareness leads to individuals reflecting on their values and ideals (Silvia & Duval, 2001). This self-reflection appears to increase prosocial behaviour (Berkowitz, 1987). However, previously studies typically manipulated self-awareness in situations in which the individual may have felt pressure from the researcher to help. Thus, experimenter pressure to behave prosocially confounds the self-awareness explanation provided in past research. We used a novel experimental paradigm to manipulate self-awareness and remove the researcher's presence to decrease the likelihood that the participant would conform to experimenter demand. Participants were 36 college students (M_age = 19.52; 25 women). The results indicated a strong probability that the experimental condition participants were more prosocial than control condition participants. These findings provide additional support for the hypothesis that self-reflection increases prosocial behaviour, even without experimenter demands. These findings and the importance of studying objective self-awareness in light of the coronavirus are discussed.     

Justice in epistemic gaps: The ‘proof paradox’ revisited

This paper defends the heretical view that sometimes we ought to assign legal liability based on statistical evidence alone. Recent literature focuses on potential unfairness to the defending party if we rely on bare statistics. Here, I show that capitulating in response to ‘epistemic gaps’—cases where there is a group of potential harmers but an absence of individuating evidence—can amount to a serious injustice against the party who has been harmed. Drawing on prominent civil law litigation involving pharmaceutical and industrial negligence, the overall aim is to illustrate moral pitfalls stemming from the popular idea that it is never appropriate to rely on bare statistics when settling a legal dispute.     

Evidence for the Big Five in analyses of familiar English personality adjectives

Studies of the natural language are a prime source of the Big-Five model, yet the factor analysis of a large, representative, and non-clustered set of English-language personality adjectives in a large sample has not yet been published. In order to test the hypothesis that finding the Big Five depends on biasing the variable selection with an investigator's preferred non-familiar terms, we present the factor analysis of 435 familiar adjectives in a combined sample (N=899) of 507 self- and 392 peer ratings. The five-factor solution reproduced the Big Five with high clarity, demonstrating generally very high correlations with Goldberg's adjective markers of the Big Five. The Intellect factor had a more moderate correlation, due to its de-emphasis of the creativity components of Factor V, a phenomenon that may occur commonly with the lexical Intellect factor.     

A defense of the very idea of moral deference pessimism

Philosophical Studies - Pessimists think that there is something wrong with relying on deference for one’s moral beliefs—at least if one is morally mature. Call this no deference. They...     

Young children's social networks as a function of age and dysfunction

Social networks provide a larger context than that of the nuclear family in which the child develops. In order to examine the networks of young children, mothers of 75 handicapped children, aged 3 to 6 years, and a matched sample of normal children were surveyed in terms of people in the child's network and frequency of daily contact. The effects of age of subject and handicapping condition on social network composition and contact were of interest. Handicapping condition played a much greater role in the network composition than did chronological age. Handicapped children had larger networks, although they did not have daily contact with network members compared to normal children. Handicapped children thus were not isolated, but appeared to have a large network composed of relatives and adults and, to a lesser extent, peers. Normal children showed a developmental shift, in terms of an increase in the proportion of peers to adults, from 3 to 6 years, whereas handicapped children did not show this change. It is suggested that the handicapped child's developmental delay and caregiving demands may necessitate greater and more prolonged adult contact, which, consequently, constrains the nature of the social network in terms of adult and peer composition. Insufficient peer contact may restrict the handicapped child's opportunity to learn important social skills.     

Time estimation: does the reference memory mediate the effect of knowledge of results?

This study presents evidence for the role of knowledge of results (KR) in the estimation of medium time intervals (4-12 s durations). Experiment 1 tested the hypothesis that KR operates at the same stage of temporal processing as attention. The absence of an interaction of attention and KR is taken as evidence against this hypothesis. Experiments 2 and 3 further studied the effects of KR in a reproduction and a production task, respectively. The effects of KR were small in the reproduction and substantial in the production task. The results are interpreted in terms of a clock-based timing model and the findings taken together converge on the interpretation that KR affects the reference memory (RM), rather than the other components of the model.