Impact of simulated visual impairment on the cognitive test performance of young adults

Aims. This study investigated the effect of simulated visual impairment on the speed and accuracy of performance on a series of commonly used cognitive tests. Methods. Cognitive performance was assessed for 30 young, visually normal subjects (M=22.0±3.1 years) using the Digit Symbol Substitution Test (DSST), Trail Making Test (TMT) A and B and the Stroop Colour Word Test under three visual conditions: normal vision and two levels of visually degrading filters (Vistech^TM) administered in a random order. Distance visual acuity and contrast sensitivity were also assessed for each filter condition. Results. The visual filters, which degraded contrast sensitivity to a greater extent than visual acuity, significantly increased the time to complete (p<.05), but not the number of errors made, on the DSST and the TMT A and B and affected only some components of the Stroop test. Conclusions. Reduced contrast sensitivity had a marked effect on the speed but not the accuracy of performance on commonly used cognitive tests, even in young individuals; the implications of these findings are discussed.     

Refining the blank line-up procedure: How should we instruct eyewitnesses?

Presenting a blank line-up—containing only fillers—to witnesses prior to showing a real line-up might be useful for screening out those who pick from the blank line-up as unreliable witnesses. We show that the effectiveness of this procedure varies depending on instructions given to witnesses. Participants (N = 462) viewed a simulated crime and attempted to identify the perpetrator from a line-up approximately 1 week later. Rejecting a blank line-up was associated with greater identification accuracy and greater diagnosticity of suspect identifications, but only when witnesses were instructed prior to the blank line-up that they would view a series of line-ups; the procedure was ineffective for screening when witnesses were advised they would view two line-ups or received no instruction. These results highlight the importance of instructions used in the blank line-up procedure, and the need for better understanding of how to interpret choosing patterns in this paradigm.     

Young children’s acquisition of knowledge about the Earth: A longitudinal study

This longitudinal study examined the acquisition of early knowledge of astronomy to determine whether children’s knowledge at any point in time is consistent with a naive “mental model.” Children were first assessed by means of open questions and drawing tasks at 2 and 3 years of age (N = 143). The knowledge was reassessed over the course of the following 3 years. The results showed that although a few indications of naive mental models were found, in most cases young children’s knowledge was fragmented and accurate knowledge was often expressed alongside inaccurate/synthetic ideas. Furthermore, it was shown that children need to know scientific facts before they start taking the global perspective when describing the world and, when faced with ambiguous open questions, children often experience difficulties that can induce them to change the types of answers they provide.     

Face value: testing the utility of contextual face cues for face recognition

The presence of multiple faces during a crime may provide a naturally-occurring contextual cue to support eyewitness recognition for those faces later. Across two experiments, we sought to investigate mechanisms underlying previously-reported cued recognition effects, and to determine whether such effects extended to encoding conditions involving more than two faces. Participants studied sets of individual faces, pairs of faces, or groups of four faces. At test, participants in the single-face condition were tested only on those individual faces without cues. Participants in the two and four-face conditions were tested using no cues, correct cues (a face previously studied with the target test face), or incorrect cues (a never-before-seen face). In Experiment 2, associative encoding was promoted by a rating task. Neither hit rates nor false-alarm rates were significantly affected by cue type or face encoding condition in Experiment 1, but cuing of any kind (correct or incorrect) in Experiment 2 appeared to provide a protective buffer to reduce false-alarm rates through a less liberal response bias. Results provide some evidence that cued recognition techniques could be useful to reduce false recognition, but only when associative encoding is strong.     

The effects of co-witness discussion on confidence and precision in eyewitness memory reports

We examined the influence of co-witness discussion on the metacognitive regulation of memory reports. Participants (N?=?92) watched a crime video. Later, a confederate confidently agreed with (gave confirming feedback), disagreed with (gave disconfirming feedback), or gave no feedback (control) regarding participants’ answers to questions about the video. Participants who received disconfirming feedback reported fewer fine-grain details than participants in the confirming and control conditions on a subsequent, individual recall test for a different question set. Unexpectedly, this decrease in fine-grain reporting was not accompanied by a decrease in participants’ confidence in the accuracy of their fine-grain responses. These results indicate that receiving social comparative feedback about one’s memory performance can affect rememberers’ metamemorial control decisions, and potentially decrease the level of detail they volunteer in later memory reports. Further research is needed to assess whether these results replicate under different experimental conditions, and to explore the effects of social influences on metamemory.     

Do social comparisons in academic settings relate to gender and academic self-confidence?

This paper reports the development of an Academic Social Comparison Scale (ASCS) to measure students’ tendencies to socially compare themselves with other students in an educational setting. The 27-item ASCS was then measured in relation to academic self-confidence in a sample of University students, using the Individual Learning Profile (ILP) scale. The study found that making downward academic social comparisons was not very commonly reported and did not relate to academic confidence in any domain measured. Confidence in numeracy, speaking, and hard IT were, however, significantly lower in those students who tended to make more upward social comparisons. The results also showed that the less students reported that they socially compared in general, the more confident they were in reading, writing, and time management. All three subscales of the ASCS showed good reliability when tested 6–9 weeks later. The ASCS showed that female students tended to make more upward academic social comparisons and less downward academic comparisons than male students. In domains such as reading and writing people’s confidence was higher if they made fewer academic social comparisons (irrespective of direction), and gender was not an important factor. Results also showed that academic confidence was neither higher nor lower in students who reported making more downwards academic comparisons. This study demonstrates the negative impact on confidence of upward social comparisons, and introduces a social comparison questionnaire specifically tailored for measuring people’s tendencies to make social comparisons in the academic domain.     

Childhood Overweight and Obesity: Maternal and Family Factors

Treatment programs for childhood overweight and obesity have highlighted the importance of the family in treatment. Considering this, it is surprising that few studies have examined the role of family factors in the development of childhood overweight and obesity. The objective of this study was to examine which family and maternal factors predict increases in weight in boys and girls during middle to late childhood. This study used longitudinal data from the childhood growth and development (GAD) Study. The GAD Study involved 286 healthy weight, overweight and obese children, aged 6–13 years at baseline, who completed baseline, 1-year follow-up and 2-year follow-up assessments. Overweight/obese children were recruited from clinical and community settings. A broad range of maternal and family factors were assessed. Linear mixed models were used to identify which factors predicted child Body Mass Index (BMI) z-scores over time. For community-based children, maternal BMI and single-parent family structure were significant longitudinal predictors of child BMI z-scores. For the clinical participants, low family income was the only significant multivariate predictor of child BMI z-scores. The strong association between child BMI, maternal BMI and family structure confirms the need to target prevention and intervention efforts for childhood overweight and obesity towards families with overweight parents, particularly single-parent families.