Learning to perceive object unity: a connectionist account

To explore questions of how human infants begin to perceive partly occluded objects, we devised two connectionist models of perceptual development. The models were endowed with an existing ability to detect several kinds of visual information that have been found important in infants’ and adults’ perception of object unity (motion, co‐motion, common motion, relatability, parallelism, texture and T‐junctions). They were then presented with stimuli consisting of either one or two objects and an occluding screen. The models’ task was to determine whether the object or objects were joined when such a percept was ambiguous, after specified amounts of training with events in which a subset of possible visual information was provided. The model that was trained in an enriched environment achieved superior levels of performance and was able to generalize veridical percepts to a wide range of novel stimuli. Implications for perceptual development in humans, current theories of development and origins of knowledge are discussed.     

Heroin Use Among Southern Arrestees: Regional Findings From the Arrestee Drug Abuse Monitoring Program

The identification of jurisdictional drug use patterns is critical to counselors who address substance abuse proactively. In the current study, heroin use data were analyzed from adult arrestees who were surveyed between 1990 and 1997 through the Arrestee Drug Abuse Monitoring program.     

Predictors of Family Functioning Within Alcoholic Families

This study assessed the effects of various predictor variables on dimensions of functioning within alcoholic families. Participants were 173 college student volunteers from alcoholic families who completed a measure of family functioning, demographic questions, and questions related to experiences in their families of origin. Child abuse, spousal violence, parental divorce, length of time living with an alcoholic parent, parental marital status, and parental availability and predictability significantly affected family functioning, whereas frequency of parental drinking did not. Results suggest that quality of parental interactions with children is more important for functioning in alcoholic families than frequency of parental drinking.     

The Psychometric Properties of the Orthogonal Cultural Identification Scale in Asian Americans

Reliability (internal consistency and test‐retest) and validity (construct and factorial) of the Orthogonal Cultural Identification Scale (OCIS; E. R. Oetting & F. Beauvais, 1990–1991) were evaluated in a sample of Asian American university students. Ethnic identification, measured using the OCIS, and acculturation, measured using the Suinn‐Lew Asian Self‐Identity Acculturation Scale (R. M. Suinn, K. Rickard‐Fugueroa, S. Lew, & P. Vigil, 1987), are hypothesized to measure related but separate constructs. Análisis de fiabilidad (consistencia interna y estabilidad temporal), y de validez (conceptual y factorial) de la Escala Ortagonal de Identificación Cultural (OCIS; E. R. Oetting & F. Beauvais, 1990–1991) fueron evaluados en un grupo de estudiantes universitarios Asiáticos Americanos. La identificación étnica fue medida usando la OCIS, y la aculturación fue medida usando la Escala de Identidad de Ser y Aculturación Asiática de Suinn‐Lew (R. M. Suinn, K. Rickard‐Figueroa, S. Lew, & P. Vigil, 1987). Se presenta la hipótesis que la identificación étnica y la aculturación miden conceptos separados que estan relacionados.     

Client attachment and coping resources

Relationships among perceptions of early parental bonding experiences, current adult attachment to significant others, and coping resources were examined in a sample of 100 adult clients seeking services through a university counselling clinic. Results of a canonical analysis indicated that secure adult attachment, higher parental care, and lower parental overprotection were significantly associated with higher coping resources. The significance of these findings for understanding the role of attachment in emotional self-regulation is discussed.     

Using Mental Imagery to Enhance the Effectiveness of Implementation Intentions

Past research shows that forming implementation intentions increases the probability of carrying out goals. The present research proposes that mental imagery can strengthen the effects of implementation intentions on goal achievement. Participants were assigned a mundane goal and were randomly assigned to one of two conditions: implementation intentions only or implementation intentions plus mental imagery. Results support the hypothesis that using mental imagery when forming implementation intentions leads to higher rates of goal achievement.     

Repetition proportion affects masked priming in nonspeeded tasks

Masked repetition priming is often greater when a larger proportion of trials involve repetition primes, suggesting that a context-sensitive unconscious process may be operating. Two recent studies have failed to obtain an effect of prime proportion in the perceptual identification (PI) task, suggesting that the effect may not occur in nonspeeded tasks. Contrary to this possibility, we report proportion effects with masked repetition primes in two nonspeeded tasks: PI and fragment completion (FC). A proportion effect occurred in the accuracy measure only in the FC task, but it occurred in the reaction time measure in both tasks. Prior failures to find proportion effects in the PI task thus may have been due, in part, to the dependent measure used. We interpret our findings in light of several recent accounts of prime proportion effects with brief primes.     

Working memory performance after acute exposure to the cold pressor stress in healthy volunteers

Effects of acute stress exposure on learning and memory have been frequently studied in both animals and humans. However, only a few studies have focused specifically on working memory performance and the available data are equivocal. The present study examined working memory performance during the Sternberg item recognition task after exposure to a predominantly adrenergic stressor. Twenty four healthy subjects were randomly assigned to a stress group or a control group. The stress group was exposed to the cold pressor stress test (CPS; i.e. insertion of the dominant hand into ice water for 60s), while 37 °C warm water was used with the control group. Twenty minutes after the stress exposure, working memory performance was tested with the Sternberg item recognition task with three levels of cognitive load. Sympathetic nervous system and hypothalamic pituitary adrenocortical (HPA) axis activation during CPS, were assessed by measuring heart rate and salivary cortisol before and during (heart rate) or 30 min after (cortisol) the stress procedure. Exposure to the CPS test was associated with a significant increase in heart rate but no increase in salivary cortisol. Participants exposed to the stress procedure showed significantly shorter reaction times during trials with higher cognitive load but tended to show higher false alarm rates than control subjects. The present results indicate that exposure to CPS can be associated with signs of both enhanced and impaired working memory performance. The observed behavioral pattern might represent a form of streamlined information processing advantageous in a threatening situation.     

Embodied infant attention

Does real time coupling between mental and physical activity early in development have functional significance? To address this question, we examined the habituation of visual attention and the subsequent response to change in two groups of 3‐month‐olds with different patterns of movement–attention coupling. In suppressors, the typical decrease in body movement at the onset of looks persists into the looks. In rebounders, the initial decrease is more transient and movement quickly returns above baseline. Suppressors and rebounders did not differ on measures of looking during habituation, but when the stimulus changed rebounders looked more than suppressors. When it did not change, they looked less. In addition, during habituation rebounders spent more time looking away from the stimulus. Rapid motor reactivation soon after gaze locks onto a target, characteristic of rebounders, may influence visual foraging and the response to change by keeping attention near a threshold of engagement.     

Randomized Controlled Pilot Study of Cognitive-Behavioral Therapy in a Sample of Incarcerated Women With Substance Use Disorder and PTSD

This randomized controlled pilot study compared a cognitive-behavioral therapy (Seeking Safety; SS) plus treatment-as-usual (TAU) to TAU-alone in 49 incarcerated women with substance use disorder (SUD) and posttraumatic stress disorder (PTSD; full or subthreshold). Seeking Safety consisted of a voluntary group treatment during incarceration and individual treatment after prison release. TAU was required in the prison and comprised 180 to 240 hours of individual and group treatment over 6 to 8 weeks. Assessments occurred at intake, 12 weeks after intake, and 3 and 6 months after release from prison. There were no significant differences between conditions on all key domains (PTSD, SUD, psychopathology, and legal problems); but both conditions showed significant improvements from intake to later time points on all of these outcomes across time. Secondary analyses at follow-up found trends for SS participants improving on clinician-rated PTSD symptoms and TAU participants worsening on self-reported PTSD symptoms. Also, SS demonstrated continued improvement on psychopathology at 3 and 6 months, whereas TAU did not. However, alcohol use improved more for TAU during follow-up. Satisfaction with SS was high, and a greater number of SS sessions was associated with greater improvement on PTSD and drug use. Six months after release from prison, 53% of the women in both conditions reported a remission in PTSD. Study limitations include lack of assessment of SS outcomes at end of group treatment; lack of blind assessment; omission of the SS case management component; and possible contamination between the two conditions. The complex needs of this population are discussed.