Perceptual learning on inspection time and motion perception

Perceptual learning on simple perceptual tasks is interpreted as plasticity of neuronal populations in the sensory cortex (M. Fahle & T. Poggio, 2002). The authors examined individual differences on perceptual learning for 2 tasks-inspection time (IT) and a motion direction discrimination task that was instantiated as random dot kinematograms. The authors' main questions were whether individual differences in perceptual learning were consistent across the 2 tasks and whether perceptual learning correlated with cognitive abilities test scores. In all, 56 young adults completed 16 threshold estimations on 1 of 2 orthogonal versions of each task. Then, the authors made 2 further threshold estimations for the untrained, orthogonal version. Participants also completed a battery of 6 cognitive abilities tests that measured fluid ability (Gf) and perceptual speed (Gs). Perceptual learning was demonstrated for both tasks, but the degree of learning across tasks was not characteristic of the individual. Learning on IT correlated with Gs (r = .35), but learning on the motion direction discrimination task was unrelated to cognitive ability. Correlations of IT with cognitive measures were stable over the training period. IT was correlated with both the motion direction discrimination task (r = -.39) and an unmasked line length judgment task (r = -.31). The authors concluded that perceptual learning on IT correlates with cognitive abilities test scores, that correlations of IT with cognitive abilities test scores are stable as task performance improves with practice, and that the IT task is psychologically complex.     

Health-Related Quality of Life Among Substance Abusers in Residential Drug Abuse Treatment

Health-related quality of life (HRQOL) in substance abusers remains an area of inquiry in need of investigation. The few studies on the topic have found substance abuser HRQOL less than that of the general population. The present research compared 303 substance abusers in long-term residential therapeutic community treatment in New York with a general non-institutionalized adult sample from New York (N = 27,465) whose data were collected between 2002 and 2006 during the yearly administrations of the Behavioral Risk Factor Surveillance System (BRFSS), a state-based system of health surveys gathering data from upwards of 350,000 adults per year across all 50 states. One sample t-tests found that the in-treatment substance abusers reported significantly more physically and mentally unhealthy days over the past 30 days, as well as significantly more inactive days over the past 30 days due to illness.     

Revisiting impulsivity in suicide: Implications for civil liability of third parties

Previous research and popular conceptualizations of suicide have posited that many suicides are the result of impulsive, “on a whim” decisions. However, recent research demonstrates that most suicides are not attempted impulsively, and in fact involve a plan. Legally, suicide has historically been considered to be a superseding intervening cause of death that exonerates other parties from liability, but currently there are two general exceptions to this view. Specifically, another party may be found responsible for a suicide if that party either caused the suicide or failed in its duty to prevent the suicide from occurring. Both of these exceptions assume that the resulting suicide was foreseeable. Given that recent research has indicated that most suicides are planned, and thereby foreseeable to a certain extent under many circumstances, this article discusses issues of foreseeability as they pertain to litigation involving third party liability for the suicide of university students, prison inmates, and mental health patients. The authors contend that the surest way for universities, prison staff, and mental health practitioners to avoid being held liable for a suicide is to appropriately assess for suicidal intent. Copyright © 2008 John Wiley & Sons, Ltd.     

Effects of Internal and External Pay Comparisons on Work Attitudes1

The effects of internal and external pay comparisons on several work attitudes were assessed within an experimental design. Participants responded to hypothetical scenarios in which their pay was greater, less, or equal to an internal and external individual or group referent. As predicted, internal and external pay comparisons predicted pay satisfaction and perceived pay fairness. Also as expected, internal equity was the stronger predictor of work motivation and perceived organizational support, and external equity predicted turnover intention more strongly. Partial support was found for the hypothesis that work attitudes would be impacted more strongly when individuals made pay comparisons with a group referent than with an individual referent other. Implications for the design of compensation systems are discussed.     

Alcohol involvement in hospital-admitted nonfatal suicide acts

We analyzed alcohol involvement in 84,005 medically identified live discharges for self-inflicted intentional injuries (typically suicide acts) from hospitals in 20 U.S. states in 1997. Alcohol was involved in 27% of the discharges. Evidence of alcohol was significantly more prevalent in men than women, but generally men drink more than women. Blacks had the highest alcohol involvement in their suicide acts relative to their drinking patterns. Overall, alcohol involvement rose and subsequently fell with age, with involvement above 30% for ages 30-55. Lowering the minimum legal drinking age to 18 from 21 could potentially raise alcohol-involved suicide hospitalizations among youth by an estimated 27%.