Backward inhibitory learning in honeybees: a behavioral analysis of reinforcement processing

One class of theoretical accounts of associative learning suggests that reinforcers are processed according to learning rules that minimize the predictive error between the expected strength of future reinforcement and its actual strength. The omission of reinforcement in a situation where it is expected leads to inhibitory learning of stimuli indicative for such a violation of the prediction. There are, however, results indicating that inhibitory learning can also be induced by other mechanisms. Here, we present data from olfactory reward conditioning in honeybees that show that (1) one- and multiple-trial backward conditioning results in conditioned inhibition (CI); (2) the inhibition is maximal for a 15-sec interval between US and CS; (3) there is a nonmonotonic dependency on the degree of CI from the US-CS interval during backward pairing; and (4) the prior association of context stimuli with reinforcement is not necessary for the development of CI. These results cannot be explained by models that only minimize a prediction error. Rather, they are consistent with models of associative learning that, in addition, assume that learning depends on the temporal overlap of a CS with two processes, a fast excitatory and a slow inhibitory one, both evoked by a reinforcer. The fmdings from this behavioral analysis of reinforcement processing are compared with the known properties of an individual, identified neuron involved in reinforcement processing in the bee brain, to further understand the mechanisms underlying predictive reward learning.     

Being dishonest about our prejudices: moral dissonance and self-justification

We applied the moral dissonance reduction framework, used to explain the maintenance of a positive self-concept in dishonest behavior, to understand self-justification of prejudice. Participants identified ambiguously negative intergroup behaviors, then evaluated those behaviors when performed by others and themselves. As predicted by moral dissonance reduction, participants were less critical of their own behavior when considering others’ behaviors before their own. In a third study directly comparing prejudiced and dishonest behavior, participants’ responses showed the greatest self-justification in the initial question about their behavior regardless of the content of the question, whereas subsequent questions showed more stability, consistent with the idea that participants adjusted their initial self-reports to avoid damage to their self-concepts.     

Linking Workplace Aggression to Employee Well-Being and Work: The Moderating Role of Family-Supportive Supervisor Behaviors (FSSB)

Purpose

The present study examined the moderating effects of family-supportive supervisor behaviors (FSSB) on the relationship between two types of workplace aggression (i.e., patient-initiated physical aggression and coworker-initiated psychological aggression) and employee well-being and work outcomes.

Methodology

Data were obtained from a field sample of 417 healthcare workers in two psychiatric hospitals. Hypotheses were tested using moderated multiple regression analyses.

Findings

Psychiatric care providers’ perceptions of FSSB moderated the relationship between patient-initiated physical aggression and physical symptoms, exhaustion and cynicism. In addition, FSSB moderated the relationship between coworker-initiated psychological aggression and physical symptoms and turnover intentions.

Implications

Based on our findings, family-supportive supervision is a plausible boundary condition for the relationship between workplace aggression and well-being and work outcomes. This study suggests that, in addition to directly addressing aggression prevention and reduction, family-supportive supervision is a trainable resource that healthcare organizations should facilitate to improve employee work and well-being in settings with high workplace aggression.

Originality

This is the first study to examine the role of FSSB in influencing the relationship between two forms of workplace aggression: patient-initiated physical and coworker-initiated psychological aggression and employee outcomes.

     

The development of category learning strategies: What makes the difference?

Category learning can be achieved by identifying common features among category members, distinctive features among non-members, or both. These processes are psychologically and computationally distinct, and may have implications for the acquisition of categories at different hierarchical levels. The present study examines an account of children’s difficulty in acquiring categories at the subordinate level grounded on these distinct comparison processes. Adults and children performed category learning tasks in which they were exposed either to pairs of objects from the same novel category or pairs of objects from different categories. The objects were designed so that for each category learning task, two features determined category membership whereas two other features were task irrelevant. In the learning stage participants compared pairs of objects noted to be either from the same category or from different categories. Object pairs were chosen so that the objective amount of information provided to the participants was identical in the two learning conditions. We found that when presented only with object pairs noted to be from the same category, young children (6 ? YO ? 9.5) learned the novel categories just as well as older children (10 ? YO ? 14) and adults. However, when presented only with object pairs known to be from different categories, unlike older children and adults, young children failed to learn the novel categories. We discuss cognitive and computational factors that may give rise to this comparison bias, as well as its expected outcomes.     

Dependence on Wrongdoing in the Consumption of Meat: A Kantian Analysis

Kant's ethics is used by some as a defence of the exploitation of animals and is criticised by others for not recognising any moral relevance of the plight of animals. These appeals overlook the broad applicability of Kant's principles. In this article, I argue that Kant's ethics implies a duty to abstain from most meat and some other animal products derived from farming. I argue that there is a Kantian principle not to choose goods that have been derived from wrongdoing, with certain qualifications. This principle isolates the wrong of using others to commit wrongdoing on one's behalf. As has been argued by others, Kant's ethics implies that animal farming as we know it in our society almost universally involves wrongdoing and the slaughter of animals is especially tied to wrongdoing. I argue for a broad sense in which these ideas together imply that choosing farmed meat, and probably other animal products, is treating animal industry workers as mere means. Thus, we have a Kantian duty to abstain from these products.     

The effects of naloxone administered into the periaqueductal gray on shock-elicited freezing behavior in the rat

Freezing behavior that occurs following footshock was found to increase in rats in which naloxone was injected into the ventrolateral region of the mesencephalic periaqueductal gray (PAG) area of the brain prior to footshock administration. Since naloxone administered into the ventrolateral region of the PAG induced minimal freezing in rats which did not receive footshock, the results suggest that the effect of naloxone on shock-induced freezing is not due to a nonspecific decrease in motor activity. Naloxone had no effect on freezing when injected into the dorsolateral region of the PAG. The data are consistent with the theory that conditioned fear induces opioid mediated analgesia, and that the ventrolateral region of the PAG is an important component of a pain-inhibitory system involved in this analgesia.     

When Two Heads Aren't Better Than One: AIDS Risk Behavior in College-Age Couples1

Individuals in intimate relationships engage in higher levels of HIV risk behavior than do individuals engaging in casual sex (e.g., Bowen & Michal-Johnson, 1989; Misovich, Fisher, & Fisher, 1996). While there are many possible reasons for this consistent pattern of effects, few studies have focused on identifying the underlying causes. Therefore, same-gender focus groups were conducted with college-age men and women in intimate relationships as participants in order to examine, qualitatively, factors particular to relationships which are associated with HIV risk. Focus-group members indicated that concerns about questioning interpersonal trust and commitment in their relationship through the introduction of condoms or HIV testing were often strong impediments to these practices. Recommendations for future HIV-prevention interventions specific to individuals in relationships are discussed.     

Symmetry as a method of proof

This paper is a logical study of valid uses of symmetry in deductive reasoning, of what underlying principles make some appeals to symmetry legitimate but others illegitimate. The issue is first motivated informally. A framework is then given covering a fairly broad range of symmetry arguments, and the formulation of symmetry provided is shown to be a valid principle of reasoning, as is a slightly stronger principle of reasoning, one that is shown to be in some sense as strong as possible. The relationship between symmetry and isomorphism is discussed, and finally the framework is extended to a more general model-theoretic setting.