Effects of shifts in food reinforcement context on rats’ consumption of concurrently available water or sucrose solution

The purpose of this study was to investigate the effects of signaled transitions from relatively rich to lean conditions of food reinforcement on drinking concurrently available water or sucrose‐sweetened water in rats. Past research demonstrated that these negative incentive shifts produce behavioral disruption in the form of extended pausing on fixed‐ratio schedules. Four male Long‐Evans rats operated on a two‐component multiple fixed‐ratio fixed‐ratio schedule. In one manipulation, the ratio was held constant and the components arranged either a large six‐pellet reinforcer (rich) or small one‐pellet reinforcer (lean). In a second manipulation, the components both produced a one‐pellet reinforcer but differed in terms of the ratio requirement, with the rich and lean conditions corresponding to relatively small and large ratios. In both manipulations, components were pseudorandomly presented to arrange four transitions signaled by retractable levers: lean‐to‐lean, lean‐to‐rich, rich‐to‐rich, and rich‐to‐lean (the negative incentive shift). During experimental conditions, a bottle with lickometer was inserted in the chamber, providing concurrent access either to tap water or a 10% sucrose solution. The negative incentive shift produced considerably more drinking than the other transitions in all rats during both manipulations. The level of drinking was not polydipsic; rather, it appears that the negative incentive shift enhanced the value of concurrently available reinforcers relative to food reinforcement.     

Mindful Parenting: A Call for Research

Interest in mindfulness-based interventions for children and adolescents is growing, but despite substantial evidence that parental distress and psychopathology adversely affects children, there is little research on how mindfulness-based parenting interventions might benefit the child as well as the parent. As an established intervention for prevention of depressive relapse, mindfulness-based cognitive therapy (MBCT) conducted with parents is an intervention that potentially could improve parent–child relationships, reduce child symptoms, and promote healthy child development. Mindful parenting interventions bring mindful attention directly to parent–child interactions and are similar but not identical to existing clinical mindfulness interventions such as MBCT. Mindfulness-based parenting interventions have an interpersonal, rather than intrapsychic focus, with particular attention given to the parent–child relationship. Preliminary research suggests that this intervention approach may reduce stress, enhance parenting satisfaction, decrease child aggression, and increase children’s prosocial behaviors. Initial evidence supporting the effectiveness of mindful parenting programs is promising and supports our call for ongoing research.     

How to handle anxiety: The effects of reappraisal, acceptance, and suppression strategies on anxious arousal

It has been suggested that reappraisal strategies are more effective than suppression strategies for regulating emotions. Recently, proponents of the acceptance-based behavior therapy movement have further emphasized the importance of acceptance-based emotion regulation techniques. In order to directly compare these different emotion regulation strategies, 202 volunteers were asked to give an impromptu speech in front of a video camera. Participants were randomly assigned to one of three groups. The Reappraisal group was instructed to regulate their anxious arousal by reappraising the situation; the Suppression group was asked to suppress their anxious behaviors; and the Acceptance group was instructed to accept their anxiety. As expected, the Suppression group showed a greater increase in heart rate from baseline than the Reappraisal and Acceptance groups. Moreover, the Suppression group reported more anxiety than the Reappraisal group. However, the Acceptance and Suppression groups did not differ in their subjective anxiety response. These results suggest that both reappraising and accepting anxiety is more effective for moderating the physiological arousal than suppressing anxiety. However, reappraising is more effective for moderating the subjective feeling of anxiety than attempts to suppress or accept it.     

Neostriatal dopamine and sensory inattention

Damage to the mesotelencephalic dopamine-containing projection of rats results in a sensory inattention, characterized by impairments in orientation toward somatosensory, visual, and olfactory stimuli. The present experiments were performed to establish which branch of this dopaminergic system is responsible for these sensorimotor deficits. Two approaches were used. In the first, individual dopamine-innervated forebrain sites were damaged by localized 6-hydroxydopamine injection into, or by electrolytic lesions of, these regions. In the second, rats were given tegmental 6-hydroxydopamine injections that damaged the entire mesotelencephalic projection and subsequently received intracerebral injections of the dopamine agonist apomorphine into specific forebrain sites in an attempt to reinstate orientation. The results demonstrate that dopaminergic terminals in the neostriatum are critical for orientation. Unilateral neostriatal 6-hydroxydopamine injections or electrolytic lesions reduced orientation to contralateral touch, whereas similar damage to other dopamine-innervated forebrain structures did not. Further, the results suggest that dopaminergic terminals in the anterior neostriatum are especially important for orientation to touch of the rostral body surface while those in the posterior neostriatum are most critical for orientation to caudal touch. After damage to all branches of the mesotelencephalic dopaminergic system, orientation to touch was reinstated by injection of apomorphine into the neostriatum but not by injection into the other dopamine-innervated forebrain regions tested.     

Position constancy and binocular convergence

The position constancy during head movement of a luminous spot in a dark room depends in part on the convergence state of the eyes. This supports a modified form of the theory that an optical-motion/head-motion comparator contributes to constancy. By incorporating convergence information, the comparator can allow [or the effect of parallax on the optical-motion/body-motion ratio.     

How Artists Create: An Empirical Study of MFA Painting Students

This paper reports on an interview study with MFA students in two different full‐time MFA degree programs in painting. The interviews were conducted as part of two ethnographic studies, each one academic year in length, of art and design schools at two U.S. universities. The goal was to explore the extended process whereby MFA student artists, in the second and final year of their degree program, create the works to be displayed in their public graduation exhibition. Using a grounded theory approach, an emergent theory was developed from the interviews, with additional information provided by studio observations and analyses of the graduation exhibitions and the accompanying written theses. This emergent theory describes the artistic creative process to be wandering, unpredictable, non‐linear, and embedded in the physical act of generating work. There is no evidence that either moments of insight, or the attempt to be original, play a role in their creative process. This emergent theory is compared with theories of the creative process by creativity researchers, and with theories of the design process proposed by design studies researchers.     

Effect of an audience on learning a novel motor skill

The purpose of this study was to assess effects of an audience on learning a novel motor skill. Subjects (N=64) were randomly assigned to one of four experimental conditions and administered 15 30-sec. trials with 30 sec. intertrial periods on a pursuit rotor task on two different days. Comparison of Time-on Target performance between conditions indicated that the No Audience condition had significantly higher performance than the Audience condition in Session 1. Comparison of Absolute Retention and Final Retention scores among the four experimental conditions in Session 2 after 48 hr. yielded no significant differences attributable to the presence of an audience, thus supporting the hypothesis that an audience would have no effect on learning.     

Contrasting task demands alter the perceived duration of brief time intervals

Four experiments were performed to assess the effects of task differences on duration judgments. Experiments 1 and 2 used the method of reproduction in prospective, within-subjects designs; their results supported previous research on the effects of task difficulty. Both experiments, using tasks that varied along somewhat different dimensions, found that subjects provided reproduction values that varied inversely with task difficulty. That is, while subjects tended to underreproduce across all tasks, the more difficult the task performed during the target interval, the greater the extent of the under-reproduction. Experiments 3 and 4 used a modification of the reproduction method by placing demands upon the subjects during both the target interval and the reproduction phase of each trial; they demonstrated that the greater the degree of contrast between demands made by the task performed during the target interval and those made during reproduction, the less accurate the duration reproduction. The results are discussed in terms of the contextual and resource allocation models of duration estimation.