Visual discrimination in an orangutan (Pongo pygmaeus): measuring visual preference

Although previous studies have confirmed that trained orangutans visually discriminate between mammals and artificial objects, whether orangutans without operant conditioning can discriminate remains unknown. The visual discrimination ability in an orangutan (Pongo pygmaeus) with no experience in operant learning was examined using measures of visual preference. Sixteen color photographs of inanimate objects and of mammals with four legs were randomly presented to an orangutan. The results showed that the mean looking time at photographs of mammals with four legs was longer than that for inanimate objects, suggesting that the orangutan discriminated mammals with four legs from inanimate objects. The results implied that orangutans who have not experienced operant conditioning may possess the ability to discriminate visually.     

Environmental enrichment protects against the effects of chronic stress on cognitive and morphological measures of hippocampal integrity

Chronic stress has detrimental effects on hippocampal integrity, while environmental enrichment (EE) has beneficial effects when initiated early in development. In this study, we investigated whether EE initiated in adulthood would mitigate chronic stress effects on cognitive function and hippocampal neuronal architecture, when EE started one week before chronic stress began, or two weeks after chronic stress onset. Adult male Sprague Dawley rats were chronically restrained (6h/d) or assigned as non-stressed controls and subdivided into EE or non-EE housing. After restraint ended, rats were tested on a radial arm water maze (RAWM) for 2-d to assess spatial learning and memory. The first study showed that when EE began prior to 3-weeks of chronic stress, EE attenuated chronic stress-induced impairments in acquisition, which corresponded with the prevention of chronic stress-induced reductions in CA3 apical dendritic length. A second study showed that when EE began 2-weeks after the onset of a 5-week stress regimen, EE blocked chronic stress-induced impairments in acquisition and retention at 1-h and 24-h delays. RAWM performance corresponded with CA3 apical dendritic complexity. Moreover, rats in EE housing (control or stress) exhibited similar corticosterone profiles across weeks, which differed from the muted corticosterone response to restraint by the chronically stressed pair-housed rats. These data support the interpretation that chronic stress and EE may act on similar mechanisms within the hippocampus, and that manipulation of these factors may yield new directions for optimizing brain integrity and resilience under chronic stress or stress related neuropsychological disorders in the adult.     

The Official Torturer: A Learning Model for Obedience to the Authority of Violence

The military training and selection procedures leading to the behavior of a torturer are discussed. The analysis is based on testimonies of army police servicemen at the first torturers' trial in Greece and on the interviews of ex-military policemen who served under the military dictatorship in Greece (1967–1974). It is concluded that, given the appropriate training condition, any individual is a potential torturer, and a model for obedience to the authority of violence is proposed.     

Effects of combining disparate groups in the analysis of ethnic differences: Variations among asian american mental health service consumers in level of community functioning

The Asian American population comprises historically, socially, and culturally diverse ethnic groups. Given this diversity, investigators caution that combining disparate ethnic groups together may lead to erroneous conclusions. Whether by choice or necessity, however, mental health studies still typically consider Asian Americans as a single ethnic category rather than as separate ethnic groups. Few investigations have addressed the consequences of this practice. This paper examines the implications of conceptualizing Asian Americans as an ethnic category versus ethnic groups, in an investigation of the community functioning status of clients in publicly funded mental health programs in King County, Washington. When treated as a single ethnic category in a multivariate linear regression model, Asian Americans are found to have a lower level of functioning difficulty than their white counterparts. However, when treated as separate ethnic groups (e.g., Vietnamese, Japanese), only one of five Asian ethnic groups has a significantly lower level of difficulty. In a separate analysis of the Asian American subsample, groups are found to differ significantly from one another with respect to functional status. Several factors, including refugee status, account for this difference.     

Temporal cortex activation during speech recognition: an optical topography study

Cortical activity during speech recognition was examined using optical topography (OT), a recently developed non-invasive technique. To assess relative changes in hemoglobin oxygenation, local changes in near-infrared light absorption were measured simultaneously from 44 points in both hemispheres. A dichotic listening paradigm was used in this experiment, in which target stimuli and non-target stimuli were presented to different ears. Subjects were asked to track targets and to press a button when targets shifted from one ear to the other. We compared three tasks: (i) a control task, in which a tone was used as the target; (ii) a repeat task, in which the target was one repeated sentence; (iii) a story task, in which the targets were continuous sentences of a story. The activity for the story task, compared with the repeat task, was localized in the left superior temporal cortex. Relative to the control task, we observed in this region a larger increase in oxyhemoglobin concentration and a decrease in deoxyhemoglobin concentration in the story task than those in the repeat task. These results suggest that the activity in the left temporal association area reflects the load of auditory, memory, and language information processing.     

Team Climate and Procedural Justice as Predictors of Occupational Strain1

The aim of this study was to test the role of procedural justice (PJ) in the relationship between team climate (TC; i.e., accepted and clear goals, participation safety, perceived support for development, and commitment to good performance) and strain. The study population consisted of all the workers at 6 health centers in Finland (n= 688). PJ evaluations were found to have a strong mediating effect on the relationship between TC and occupational strain. This finding was interpreted as supporting the relational model of PJ, which states that people use quality of social relationships as an important indicator of fair treatment and that, in turn, is related to occupational strain.     

Optimism and pessimism as predictors of change in health after death or onset of severe illness in family.

The authors prospectively examined changes in health after a major life event (death or onset of severe illness in family) among 5,007 employees (mean age=44.8 years) whose optimism and pessimism levels were assessed in 1997 and major life events in 2000. Health was indicated by sickness absence days during a period covering 36 months prior to the event and 18 months after the event. Increase in sick days after the event was smaller and returned to the prevent level more quickly among highly optimistic individuals than among their counterparts with low optimism. Parallel changes were not observed in relation to pessimism. These findings suggest that optimism may reduce the risk of health problems and may be related to a faster recovery after a major life event.     

The role of selective attention in visual awareness of stimulus features: Electrophysiological studies

Attention and awareness are closely related, but the nature of their relationship is unclear. The present study explores the timing and temporal evolution of their interaction with event-related potentials. The participants attended to specific conjunctions of spatial frequency and orientation in masked (unaware) and unmasked (aware) visual stimuli. A correlate of awareness appeared 100-200 msec from stimulus onset similarly to both attended and unattended features. Selection negativity (SN), a correlate of attentional selection, emerged in response to both masked and unmasked stimuli after 200 msec. This double dissociation between correlates of awareness and SN suggests that the electrophysiological processes associated with feature-based attentional selection and visual awareness of features can be dissociated from each other at early stages of processing. In a passive task, requiring no attention to the stimuli, early electrophysiological responses (before 200 msec) related to awareness were attenuated, suggesting that focal attention modulates visual awareness earlier than does selective feature-based attention.     

Cognition and incident coronary heart disease in late midlife: The Whitehall II study

The purpose of this study was to investigate whether cognitive function in midlife predicts incident coronary heart disease (CHD), followed up over 6 years. Data on 5292 (28% women, mean age 55) individuals free from CHD at baseline were drawn from the British Whitehall II study. We used Cox regression to model the association between cognition and CHD in analyses adjusted for socio-demographic variables, cardiovascular risk factors and health behaviors. The results show a one standard deviation lower score on the “general” cognitive measure and measures of reasoning and vocabulary to be associated with elevated CHD risk. There was some evidence that these effects differed between high and low socioeconomic status (SES) groups with associations only seen in the low SES group. These results were not explained by threshold effects or by the different SES groups representing different parts of the cognitive test score distribution. Three other possible explanations of these results are discussed: sub clinical vascular disease drives the observed association but no effect is observed in the high SES group due to compensation provided by greater cognitive reserve, cognition is a marker of overall bodily integrity particularly in low-SES groups, and SES is a moderator of the association between cognition and CHD, because it marks a range of other risk factors.     

EAS temperaments as predictors of unemployment in young adults: A 9-year follow-up of the Cardiovascular Risk in Young Finns Study

EAS temperament traits (negative emotionality, activity, sociability) are known to be associated with psychosocial adjustment. We examined whether these traits also predict unemployment in young adults. The participants (n = 1493–1893) were from the population based Cardiovascular Risk in Young Finns Study. EAS temperaments were assessed three times during a 9-year period from 1992 to 2001. Unemployment status and duration of unemployment were assessed in 2001 when the participants were from 24- to 39 -year olds. Especially higher negative emotionality and lower activity were associated with greater likelihood of reporting unemployment at the end of the follow-up. Higher negative emotionality and lower sociability and lower activity predicted unemployment duration. These results suggest that temperament traits are associated with risk of unemployment.