The effects of negative reinforcement for irritable aggression on resident-intruder behavior

This experiment demonstrated that rats trained to display elevated levels of shock-induced aggression in a negative reinforcement paradigm displayed more boxing behavior than yoked control groups in a later test in which intruder rats were placed in the home cage of resident rats. Resident or intruder status did not affect the influence of the negative reinforcement procedure on the observed resident-intruder behavior of trained animals; however, naive intruders paired with trained residents displayed increased defensive behavior, suggesting that negative reinforcement for shock-induced aggression affected the behavior of these residents.     

“We Always Spend Time Together on Sundays”: How Grandparents and Their Grandchildren Think About and Use Informal Learning Spaces

ABSTRACT

Self-reflection is critical for visitors to make sense of an exhibit collection in which they are the subject of investigation and may play an important role in any informal learning context. This study examines this construct by listening for self-reflective talk at Mind, an exhibit collection focused on helping visitors explore aspects of themselves rather than external objects or phenomena. It addresses 3 questions: (a) What does self-reflective talk sound like in such a collection? (b) What categories of self-reflective talk are prevalent? (c) What types of exhibits engender what categories of self-reflective talk? Findings indicate that self-reflective talk comes in various forms. Self-monitoring talk, including self-assessments about how visitors are feeling and doing and what they know, is more prevalent than self-connecting talk, comments about visitors’ own lives, values, and their sense of self. Comparisons among different types of exhibits suggest that exhibits designed for multiple users prompt high frequencies of self-connecting talk and self-monitoring talk, whereas interactive exhibits and exhibits that pose a challenge elicit high frequencies of self-monitoring but not self-connecting talk. Additional work is needed to better understand self-reflection, its role in informal learning, and effective means of fostering self-reflection in science museums.     

Response selection influences inhibition of return

Previous work has suggested that there may be a relationship between the magnitude of inhibition of return (IOR) and the number of possible responses in the perceptual‐motor task. To test this possibility, the present experiment used a display that contained four horizontally aligned cue/target locations. In different blocks of trials, subjects responded to the target either with a one‐response detection key press, a two‐response localisation key press, or a four‐response localisation key press. The results showed the largest magnitude of IOR was found in the one‐response condition and the least in the four‐response condition. These results suggest that IOR may be most effective in inhibiting relatively prepotent responses and the inhibitory effect weakens when responses require more intricate sensorimotor mappings.     

Positive priming: Locations containing relevant information are labeled accordingly

Individuals engaged in a location task where the relevancy status [relevant (stimulus) vs irrelevant (distractor) information] of these locations was reversed from one trial (prime) to the next (probe). The results produced by these reversals (Distractor-to-Stimulus and Stimulus-to-Distractor) indicated that both stimulus and distractor items are given relevancy status labels which participate in the future processing at the labeled locations. These findings support the view that selective processing involves both `facilitatory' and `inhibitory' components. Further, unlike identity tasks, the data indicated that neither the formation nor the subsequent use of these `location' labels (stimulus or distractor) is related to the presence of a response conflict.PsycINFO classification: 2330; 2340     

Shock source and intensity: Variables in shock-induced fighting

Alternating current, direct current, and rectified alternating current shock were compared at four shock intensities to assess differential influences on shock-induced fighting in rats. At higher shock intensities, the data paralleled the Campbell and Masterson (1969) equal aversion function, but at lower shock intensities, differences among shock types with respect to frequencies of shock-induced fighting were obtained. These results suggested that, at lower shock intensities, shock type is a variable in shock-induced aggression research with rats.     

Individual differences in skewed financial risk-taking across the adult life span

Older adults are disproportionately targeted by fraud schemes that advertise unlikely but large returns (positively skewed risks). We examined adult age differences in choice and neural activity as individuals considered risky gambles. Gambles were symmetric (50% chance of modest win or loss), positively skewed (25% chance of large gain), or negatively skewed (25% chance of large loss). The willingness to accept positively skewed relative to symmetric gambles increased with age, and this effect replicated in an independent behavioral study. Whole-brain functional magnetic resonance imaging analyses comparing positively (vs. negatively) skewed trials revealed that relative to younger adults, older adults showed increased anticipatory activity for negatively skewed gambles but reduced activity for positively skewed gambles in the anterior cingulate and lateral prefrontal regions. Individuals who were more biased toward positively skewed gambles showed increased activity in a network of regions including the nucleus accumbens. These results reveal age biases toward positively skewed gambles and age differences in corticostriatal regions during skewed risk-taking, and have implications for identifying financial decision biases across adulthood.     

Building Trust in Business Schools Through Ethical Governance

This paper presents conceptual arguments to suggest that trust within organizations and trustworthiness of organizations are built through ethical governance mechanisms. We ground our analysis of trust, trustworthiness, and stewardship in the business literature and provide the context of business school governance as the focus of our paper. We present a framework that highlights the importance of knowledge, resources, performance focus, transparency, authentic caring, social capital and citizenship expectations in creating a basis for the ethical governance of organizations. A version of this paper was presented at the European Academy of Management, 2005.     

Social disadvantage and neglectful parenting as precursors to the development of antisocial and aggressive child behavior: Testing a theoretical model

The present study tested a theoretical model advanced to understand the direct and mediated effects of social disadvantage, neglectful parenting, and punitive parenting in the developmental trajectory of aggressive and antisocial behavior in young school‐aged children. To test the model, families of 310 first grade children and 361 fifth grade children, participating in a universal prevention trial in high‐risk areas of a medium‐sized metropolitan area, provided data. Multi‐method and multi‐source indices of the four predictive constructs (Social Disadvantage, Denial of Care Neglect, Supervisory Neglect, and Punitive Discipline) were obtained at the time of enrollment. Multi‐method and multi‐source indices of the criterion construct (Aggression and Antisocial Behavior) were obtained at the time of enrollment and at a five year follow‐up. Based on structural equation modeling, the results established care neglect as a mediator of social disadvantage, and the importance of care neglect to both punitive discipline and antisocial outcomes in the first‐ and fifth‐grade cohorts. Supervisory neglect, however, was important in the antisocial outcome of the fifth‐grade cohort only. Overall, the results established the importance of distinguishing between two subtypes of neglect and the need to consider the role of discipline in concert with neglect when attempting to understand the impact of parenting on the development of antisocial behavior. Aggr. Behav. 30:187‐205, 2004. © 2004 Wiley‐Liss, Inc.