Validation of a novel cognitive bias task based on difference in quantity of reinforcement for assessing environmental enrichment

Cognitive bias tasks purport to assess affective states via responses to ambiguous stimuli. We hypothesized that a novel cognitive bias task based on positive reinforcement using quantity differences would detect changes in affect in captive grizzly bears (Ursus arctos horribilis). We trained bears (n = 8) to respond differently (nose or paw touch) to two stimuli (light or dark gray cue cards), with responses counterbalanced across bears. The two cues signaled a small or large food reward, respectively. Responses to ambiguous probe stimuli (i.e., shades of gray) intermediate to the trained stimuli were classified as either ‘optimistic,’ appropriate for the larger reward, or ‘pessimistic,’ appropriate for the smaller reward. In Experiment 1, we explored the contrast in reward size necessary to detect a change in response across probe stimuli (large reward, 3 or 6 apple slices: small reward, 1 slice). We observed a change in response across probe stimuli, with no difference in response between reward-value groups, indicating that a contrast of 3:1 apple slices was sufficient to affect responses. In Experiment 2, we investigated cognitive bias after 2.1 h of exposure to enrichment items varying in attractiveness. Results were unaffected by enrichment type or time spent interacting with enrichments, indicating that the task failed to demonstrate criterion validity for comparing mood following exposure to different enrichment items. However, greater time spent pacing prior to testing was associated with ‘optimistic’ judgments. The data provide some support for use of cognitive bias tasks based on quantity differences in animal welfare assessments involving captive wildlife.     

Running is the neurogenic and neurotrophic stimulus in environmental enrichment

Environmental enrichment (EE) increases dentate gyrus (DG) neurogenesis and brain-derived neurotrophic factor (BDNF) levels. However, running is considered an element of EE. To dissociate effects of physical activity and enrichment on hippocampal neurogenesis and BDNF levels, young female C57Bl/6 mice were housed under control, running, enrichment, or enrichment plus running conditions, and injected with bromodeoxyuridine. Cell genesis was assessed after 12 d and differentiation was analyzed 1 mo later. In addition, locomotor activity in the open field and hippocampal mature BDNF peptide levels were measured. Open-field adaptation was improved in all groups, compared to controls, but more so with running. New cell proliferation, survival, neuron number, and neurotrophin levels were enhanced only when running was accessible. We conclude that exercise is the critical factor mediating increased BDNF levels and adult hippocampal neurogenesis.     

Working and reference memory of pigs (Sus scrofa domesticus) in a holeboard spatial discrimination task: the influence of environmental enrichment

Interest in cognitive research in pigs is increasing, but little is known about the impact of environmental conditions on pigs’ cognitive capabilities. The present study investigated the effect of environmental enrichment on cognitive performance of pigs in a holeboard spatial task, in which they had to discriminate four baited buckets out of 16. Pigs (n = 32) were either housed in stimulus-poor, barren pens, or in larger pens enriched with rooting substrates. Pigs were subjected to 30 holeboard trials. Both working memory (WM), that is, the ratio (baited visits/total number of (re)visits to baited buckets), and reference memory (RM), that is, the ratio ((re)visits to baited buckets/total number of visits to all buckets), improved over trials. WM scores were higher in pigs from enriched pens than in pigs from barren pens. Housing did not affect RM scores. Personality type of the pigs, as assessed early in life using a backtest, did not affect WM or RM. In conclusion, housing conditions of pigs did not affect reference memory, but environmental enrichment improved working memory of pigs in a spatial discrimination task. Based on the findings of this study, we suggest that cognitive functioning of pigs may be impaired under commonly used housing conditions.     

Social influence on the expression of robbing and bartering behaviours in Balinese long-tailed macaques

Animal Cognition - Animals use social information, available from conspecifics, to learn and express novel and adaptive behaviours. Amongst social learning mechanisms, response facilitation occurs...     

The child in time: the influence of parent-child discussion about a future experience on how it is remembered

We investigated the influence of preparation provided by parents on preschoolers' recall. One day before children participated in a staged novel event, parents discussed the event with their child either with (verbal+photos) or without (verbal) photographs. Parents and children in a control condition read an unrelated story. Then 8-10 days later the children were interviewed about the event. Children in the verbal+photos condition recalled significantly more than those in the control condition. Parental preparation style (e.g., evaluations, hypothetical language) was associated with the child's contributions to the preparatory discussion, but no aspect of parent or child style or content was associated with children's verbal recall. Similarly, there were no significant associations between children's performance on a task of episodic future thinking, and their preparatory discussion or recall, although episodic future thinking was strongly associated with language ability. The potential underlying mechanisms and theoretical implications are discussed.     

Cognitive biases and obsessive-compulsive symptoms in children: examining the role of maternal cognitive bias and child age

Objective: Multiple cognitive biases associated with adult obsessive-compulsive disorder (OCD) were tested in a clinical sample of children (ages 7-11) and adolescents (12-17) and their mothers. This study examined (a) the associations between child cognitive biases and OCD severity, (b) maternal cognitive biases and child OCD severity, and (c) maternal cognitive bias and child cognitive bias. It was hypothesized that age would significantly moderate these relationships, with stronger associations with OCD severity for cognitive bias in adolescents (relative to children), and maternal cognitive bias in younger children (relative to adolescents). Method: Forty-six children and adolescents diagnosed with OCD and their mothers completed questionnaires assessing responsibility bias, thought-action fusion (TAF), thought suppression, and metacognitive beliefs. OCD symptoms were assessed using structured diagnostic interviews and semistructured symptom interviews. Results: As predicted, age significantly moderated associations between (a) child cognitive variables and OCD severity-specifically between child responsibility and child metacognition, which were associated with OCD severity for adolescents only; (b) maternal cognitive biases and child OCD severity-specifically for maternal responsibility and thought suppression, which were significantly and positively associated with child OCD severity but not adolescent OCD severity; and (c) maternal cognitive biases and child cognitive bias-such that significant associations were evident only in the younger child sample, and only between maternal TAF self and metacognition, with child suppression and child TAF moral, respectively. Conclusion: Maternal cognitive biases are more consistently linked to greater OCD severity among younger children, whereas personal cognitive biases are associated with greater OCD symptoms in adolescents. Treatments for pediatric OCD are likely to be improved by age-specific considerations for the role of maternal and child cognitive biases associated with OCD.     

Obsessive-compulsive behaviours in specific situations: the relative influence of appraisals of control, responsibility and threat

Obsessive-compulsive disorder (OCD) is characterized by repeated and persistent attempts by the individual to control their thoughts and by taking action through rituals in order to prevent feared or personally distressing outcomes. While cognitive theories of OCD have generated supportive research findings and effective treatments, they have not considered broader control beliefs that may motivate aspects of OC-phenomenology. We have previously proposed that broader control beliefs, specifically desire for control and sense of control, may play a role in OC-symptoms (Moulding & Kyrios, 2006). In the present study, non-clinical participants (N=219) were presented with four hypothetical scenarios relevant to an OCD-checking concern, and using a manipulation paradigm, the relationship between control constructs and appraisals hypothesized to be relevant to OCD (threat, responsibility) was examined. Desire for control was moderately affected to responsibility and threat appraisals, while sense of control did not relate to these constructs. The relationship between aspects of OC-phenomenology and appraisals of control, responsibility and threat were also investigated. Higher desire for control predicted both affect and action, while a lower sense of control predicted higher distress and action, over-and-above appraisals of threat and responsibility. Control appraisals were particularly relevant to use of action, and to affect in the low responsibility situations. A possible interactive model of desire for control, threat and responsibility is discussed.     

Effects of daily environmental enrichment on memory deficits and brain injury following neonatal hypoxia-ischemia in the rat

Environmental enrichment (EE) results in improved learning and spatial memory, as well as attenuates morphological changes resulting from cerebral ischemia in adult animals. This study examined the effects of daily EE on memory deficits in the water maze and cerebral damage, assessed in the hippocampus and cerebral cortex, caused by neonatal hypoxia-ischemia. Male Wistar rats in the 7th postnatal day were submitted to the Levine-Rice model of neonatal hypoxia-ischemia (HI), comprising permanent occlusion of the right common carotid artery and a period of hypoxia (90 min, 8%O(2)-92%N(2)). Starting two weeks after the HI event, animals were stimulated by the enriched environment (1h/day for 9 weeks); subsequent to the stimulation, performance of animals in the water maze was assessed. HI resulted in spatial reference and working memory impairments that were completely reversed by EE. Following the behavioral study, animals were killed and the hippocampal volume and cortical area were estimated. There was a significant reduction of both hippocampal volume and cortical area, ipsilateral to arterial occlusion, in HI animals; environmental stimulation had no effect on these morphological measurements. Presented data indicate that stimulation by the daily environmental enrichment recovers spatial memory deficits caused by neonatal hypoxia-ischemia without affecting tissue atrophy in either hippocampus or cortex.     

Developmental changes in understanding the influence of emotion upon cognitive performance and motivation

In the light of recent research concerned with children's understanding of mind, a study was conducted in order to test the hypotheses (a) that only older children (i.e., 8-year-olds) would understand that emotional states can influence cognitive performance, but (b) that both older and younger children (i.e., 5- and 8-year-olds) would understand its influence upon cognitive motivation. Children were explicitly questioned about the consequences for cognition and motivation of negative affect. Results based on children's predictions and justifications provided substantial support for the hypotheses.Sincere thanks are extended to the teachers and children of Hillside Infant and Junior Schools and Frithwood Primary School, Northwood, Middlesex. We wish also to express our gratitude to two anonymous reviewers for their comments on an earlier version of this paper.     

Mood and heuristics: the influence of happy and sad states on sensitivity and bias in stereotyping

The influence of mood states on the propensity to use heuristics as expressed in stereotypes was examined using signal detection statistics. Participants experienced happy, neutral, or sad moods and "remembered" whether names connoting race (African American, European American) belonged to social categories (criminal, politician, basketball player). Positive mood increased reliance on heuristics, indexed by higher false identification of members of stereotyped groups. Positive mood lowered sensitivity (d'), even among relative experts, and shifted bias (beta) or criterion to be more lenient for stereotypical names. In contrast, sad mood did not disrupt sensitivity and, in fact, revealed the use of a stricter criterion compared with baseline mood. Results support theories that characterize happy mood as a mental state that predisposes reliance on heuristics and sad mood as dampening such reliance.     

Genetic and environmental contributions to the associations between intraindividual variability in reaction time and cognitive function

Intraindividual variability (IIV) in reaction time has been related to cognitive decline, but questions remain about the nature of this relationship. Mean and range in movement and decision time for simple reaction time were available from 241 individuals aged 51–86 years at the fifth testing wave of the Swedish Adoption/Twin Study of Aging. Cognitive performance on four factors was also available: verbal, spatial, memory, and speed. Analyses indicated that range in reaction time could be used as an indicator of IIV. Heritability estimates were 35% for mean reaction and 20% for range in reaction. Multivariate analysis indicated that the genetic variance on the memory, speed, and spatial factors is shared with genetic variance for mean or range in reaction time. IIV shares significant genetic variance with fluid ability in late adulthood, over and above and genetic variance shared with mean reaction time.     

There is nothing either good or bad but thinking makes it so: Informational support and cognitive appraisal of the work‐family interface

This paper examines whether cognitive appraisals regarding work‐family role combination can be influenced by providing informational support. We conducted an experiment among female employees with young children working in a financial services organization (N=149). Participants received information communicating either a scarcity or an expansion perspective on human energy, prior to completing a survey. In support of our predictions, results showed that employees appraised the task of combining their work and family roles more positively after exposure to an expansion rather than a scarcity message. This research offers new theoretical insights into the role of cognitive appraisal in work‐family research and offers scope for designing intervention programs that help employees to view role‐combining more positively.     

Psychometrics and psychometricians in the 20th and 21st centuries: how it was in the 20th century and how it is now

This article is based largely upon the author's invited address at the 113th annual convention of the American Psychological Convention, Washington, DC, as the 2005 recipient of the Samuel J. Messick Award bestowed by APA Division 5 and the Educational Testing Service. The author summarizes the growth of graduate training in psychometrics and quantitative psychology, in the years prior to and following the end of WWII. He then opines the steady decline in the training of psychometricians and quantitative psychologists beginning in the 1970s and continuing into the 20th century. Likely causes of the decline are inferred and prospects for strengthening the quantitative skills of doctorates are discussed, including recommendations for reversing the downward trend.     

Hearing living symbols and nonliving icons: Category specificities in the cognitive processing of environmental sounds

The neurocognitive processing of environmental sounds and linguistic stimuli shares common semantic resources and can lead to the activation of motor programs for the generation of the passively heard sound or speech. We investigated the extent to which the cognition of environmental sounds, like that of language, relies on symbolic mental representations independent of the acoustic input. In a hierarchical sorting task, we found that evaluation of nonliving sounds is consistently biased toward a focus on acoustical information. However, the evaluation of living sounds focuses spontaneously on sound-independent semantic information, but can rely on acoustical information after exposure to a context consisting of nonliving sounds. We interpret these results as support for a robust iconic processing strategy for nonliving sounds and a flexible symbolic processing strategy for living sounds.     

Life-long environmental enrichment differentially affects the mnemonic response to estrogen in young, middle-aged, and aged female mice

The present study was designed to examine whether life-long exposure to standard or enriched housing affects the ability of estrogen to improve spatial and object memory throughout the lifespan. Three-week-old female mice were maintained in standard or enriched housing up to and through ovariectomy and behavioral testing at 5, 17, or 22 months of age. Spatial memory was tested in the Morris water maze and object memory was tested using an object recognition task. Immediately after training each day, mice were injected intraperitoneally with vehicle or 0.2 mg/kg 17beta-estradiol. Among young females, object recognition was enhanced by estradiol alone, an effect that was reduced by enrichment. In contrast, spatial water maze performance was impaired by estradiol alone, but improved by the combination of both estradiol and enrichment. At middle-age, object recognition was enhanced by estradiol or enrichment alone, and the combination of both treatments. Spatial memory in the water maze was also improved by both treatments at middle-age, but the beneficial effects of estradiol were limited to standard-housed females. Finally, whereas enrichment in aged females significantly enhanced performance in both tasks, estradiol had no effect at this age in either task. In total, the data indicate that life-long enrichment can significantly alter the extent to which estradiol affects memory in mice throughout the lifespan. Importantly, the interaction between these treatments is highly dependent on age and type of memory tested.     

Bidirectional influences in mother–toddler dyads: an examination of the relative influence of mothers' and children's behaviours

This study examined bidirectional relationship between mothers' lax and overreactive discipline and children's misbehaviour and negative effect. We examined the moment‐to‐moment stability of mothers' and children's behaviours (actor effects) and mothers' and children's influence on their partners' subsequent behaviours (partner effects). Participants were 71 mothers and their 24‐ to 48‐month‐old children observed during a 30‐min interaction. Both children and mothers exhibited stability in their own behaviours and influenced the subsequent behaviours of their partners. Additionally, a comparison of partner effects indicated that overreactive discipline more strongly predicted child's negative effect than child's negative effect predicted overreactive discipline. In contrast, although a child's negative effect predicted lax discipline, lax discipline did not predict subsequent child's negative effect. Copyright © 2010 John Wiley & Sons, Ltd.