Neonate plains garter snakes (Thamnophis radix) are attracted to conspecific skin extracts

Several species of snakes aggregate in areas previously marked by conspecifics. However, species differences and sources of such chemical signals have received little attention. Methylene chloride-soluble substances from shed epidermis of adult plains garter snakes attracted neonate conspecifics, whereas similar extracts from a congener and a viperid did not. The functional significance of such conspecific aggregation may relate to location of hibernacula, foraging areas, osmoregulation, or predation avoidance.     

SUCCESSIVE REVERSALS OF A CLASSICALLY CONDITIONED HEART-RATE DISCRIMINATION1

Rats were trained to criterion in successive reversals of a classically conditioned heart-rate discrimination. Criterion was attained more rapidly in the later reversals in the series than in the early reversals and the inter-problem learning curve was of the same general form as that found with successive instrumental discrimination reversal in the same species.     

Probability kinematics

Probability kinematics is studied in detail within the framework of elementary probability theory. The merits and demerits of Jeffrey's and Field's models are discussed. In particular, the principle of maximum relative entropy and other principles are used in an epistemic justification of generalized conditionals. A representation of conditionals in terms of Bayesian conditionals is worked out in the framework of external kinematics.     

Independence of Multiple Verdicts by Jurors and Juries1

An assumption underlying the common practice of permitting a juror to serve on more than one jury is that jurors can and will reach multiple verdicts independently. Two studies were carried out to examine this assumption. The first experiment had mock jurors consider several cases in succession. Subjects exhibited a clear contrast effect on the strength of evidence; those subjects who initially saw strong prosecution cases were less likely to convict in a moderate test case than those who had initially seen wcak prosecution cases. In the second study, the contrast hypothesis was tested for actual juries' verdicts through archival analyses. The results of this field study paralleled those obtained in the experimental study. The discussion focused upon alternative theoretical explanations for these results, implications for trial practice, and the strengths and weak-nesses of the methodologies applied in these studies.     

Are more items identified than can be reported?

Subjects are typically able to report only about four items from a many-item array presented tachistoscopically (full-report span). Current models of visual information processing disagree as to whether the limiting process is best represented as identification or as short-term memory. Estes and Taylor have argued that the number of items identified is up to twice the full-report span and, hence, that memory limits report. Experiment 1 here used a memory-probe method which showed that when no position report is required the large number of items that were identified in the Estes and Taylor paradigm is not greater than the number in a posticonic memory. Experiment 2 indicated that when position report is required the number of items identified (with correct position) does not exceed the number which can be reproduced in full report. These results support models in which memory is entailed by identification either as an aspect of the identification process or as a separate stage.     

Shared Moral and Spiritual Development Among Human Persons and Artificially Intelligent Agents

Technical advances in artificial intelligence make somewhat likely the possibility of robotic or software agents exhibiting or extending human-level intelligence within a few decades. Theological investigation can help meet significant research goals in artificial intelligence by orienting the development of agent communication and moral reasoning toward a shared moral and spiritual development of human persons and intelligent agents. In particular, Josiah Royce’s Loyalty-to-Loyalty initiates a moral stance within which humans and intelligent agents can develop constructive ethical frameworks and his semiotic philosophy of community can guide the development and functioning of an agent’s interpretive processes and can model shared spiritual formation.     

Initiation of evidence-based psychotherapies in Veterans with posttraumatic stress disorder

The Department of Veterans Affairs (VA) requires that all VA hospitals and clinics provide access to evidence-based psychotherapies (EBPs). Despite these widespread dissemination efforts, only a minority of Veterans receive EBP services. Reasons for these low rates of EBP utilization are largely unknown. This study examined the characteristics of Veterans with posttraumatic stress disorder (PTSD) who did (Initiation group) and did not (No-Initiation group) initiate a VA-approved EBP after participating in an information session. Veterans chose their preferred treatment from a menu of EBPs. Results demonstrated that Veterans in the No-Initiation group had longer periods of time between their referral and first EBP visit. Among Veterans in the Initiation group, the majority (68%) initiated a trauma-focused EBP as their first or second treatment, suggesting that providing a range of treatment options did not negatively impact their willingness to engage in PTSD treatment. Results are discussed in terms of VA initiatives to improve access to and initiation of mental health care for Veterans.     

Church-based health behavior programs: Using social cognitive theory to formulate interventions for at-risk populations

Epidemiological analyses conclude that the major contributors to all-cause premature mortality and morbidity are smoking, alcohol abuse, inappropriate diet, and a sedentary lifestyle. Efforts to modify these health behaviors in populations with community and worksite interventions, although initially promising, have had difficulty in sustaining health-behavior changes. More intensive, theoretically based interventions targeted to at-risk groups and delivered in smaller social units, such as churches and other religious organizations, have been recommended. An intervention based on social cognitive theory that entails integrating self-regulatory procedures with social and environmental supports in rural churches serving people from lower socioeconomic groups is described in detail.     

Sleep deprivation selectively impairs memory consolidation for contextual fear conditioning

Many behavioral and electrophysiological studies in animals and humans have suggested that sleep and circadian rhythms influence memory consolidation. In rodents, hippocampus-dependent memory may be particularly sensitive to sleep deprivation after training, as spatial memory in the Morris water maze is impaired by rapid eye movement sleep deprivation following training. Spatial learning in the Morris water maze, however, requires multiple training trials and performance, as measured by time to reach the hidden platform is influenced by not only spatial learning but also procedural learning. To determine if sleep is important for the consolidation of a single-trial, hippocampus-dependent task, we sleep deprived animals for 0–5 and 5–10 h after training for contextual and cued fear conditioning. We found that sleep deprivation from 0–5 h after training for this task impaired memory consolidation for contextual fear conditioning whereas sleep deprivation from 5–10 h after training had no effect. Sleep deprivation at either time point had no effect on cued fear conditioning, a hippocampus-independent task. Previous studies have determined that memory consolidation for fear conditioning is impaired when protein kinase A and protein synthesis inhibitors are administered at the same time as when sleep deprivation is effective, suggesting that sleep deprivation may act by modifying these molecular mechanisms of memory storage.