Associations Between Grandparent Involvement and Psychological Difficulties in Adolescents Facing Family Adversity

Journal of Child and Family Studies - The accumulation of disruptive family events has a well-established association with adolescent mental health problems. In this study, we investigated whether...     

Expertise and recollective experience: recognition memory for familiar and unfamiliar academic subjects

Two experiments investigated whether expertise effects in recognition memory could be found for different academic subjects. The roles of subjective experience and repetition on such effects were also explored. Experiment 1 showed that overall recognition memory was greater for familiar than for unfamiliar academic words (the expertise effect). Additionally, this effect was attributable to the subjective experience of remembering rather than knowing. Experiment 2 showed that repetition of stimulus items at study eliminated these expertise effects. Previous research has generally failed to find expertise effects in overall recognition memory. The present findings show that expertise effects do occur in overall recognition memory and are associated with the richer memorial experience of remembering rather than knowing. Copyright © 2005 John Wiley & Sons, Ltd.     

No intrinsic number bias: Evaluating the role of perceptual discriminability in magnitude categorization

Accumulating evidence suggests that there is a spontaneous preference for numerical, compared to non-numerical (e.g., cumulative surface area), information. However, given a paucity of research on the perception of non-numerical magnitudes, it is unclear whether this preference reflects a specific bias towards number, or a general bias towards the more perceptually discriminable dimension (i.e., number). Here, we found that when the number and area of visual dot displays were matched in mathematical ratio, number was more perceptually discriminable than area in both adults and children. Moreover, both adults and children preferentially categorized these ratio-matched stimuli based on number, consistent with previous work. However, when number and area were matched in perceptual discriminability, a different pattern of results emerged. In particular, children preferentially categorized stimuli based on area, suggesting that children's previously observed number bias may be due to a mismatch in the perceptual discriminability of number and area, not an intrinsic salience of number. Interestingly, adults continued to categorize the displays on the basis of number. Altogether, these findings suggest a dominant role for area during childhood, refuting the claim that number is inherently and uniquely salient. Yet they also reveal an increased salience of number that emerges over development. Potential explanations for this developmental shift are discussed.

Research Highlights

• Previous work found that children and adults spontaneously categorized dot array stimuli by number, over other magnitudes (e.g., area), suggesting number is uniquely salient.
• However, here we found that when number and area were matched by ratio, as in prior work, number was significantly more perceptually discriminable than area.
• When number and area were made equally discriminable (‘perceptually-matched’), children, contra adults, spontaneously categorized stimuli by area over number (and other non-numerical magnitudes).
• These findings suggest that area may be uniquely salient early in childhood, with the previously-observed number bias not emerging until later in development.

     

Suicide Risk Documented During Veterans' Last Veterans Affairs Health Care Contacts Prior to Suicide

A total of 295 veterans who died by suicide in 2009 across 11 states and received Veterans Affairs (VA) health care in the 6 months prior to death were identified. The suicide risk factors documented and the care received at these veterans' last VA contacts are described, and the study explores whether veterans present differently to VA care (i.e., different risk factors documented or different care settings accessed) based on the proximity of their last contact to suicide. Many veterans were seen in primary care (n = 136; 46%) for routine follow‐up (n = 168; 57%). Fifty‐three (18%) were assessed for suicidal thoughts; 20 (38%) of whom endorsed such thoughts. Although higher frequencies of some risk factors at last contacts more proximal to suicide compared to those more distal were observed, findings overall highlight the challenges clinicians face detecting enhanced risk prior to suicide.     

The use of an intermittent schedule of reinforcement to evaluate detection dogs’ generalization from smokeless-powder

Animal Cognition - Odor generalization is essential for detection dogs. Regardless of its importance, limited research is available on detection dog odor generalization. The objectives of this...     

Didn't You Run the Spell Checker? Effects of Type of Spelling Error and Use of a Spell Checker on Perceptions of the Author

We investigated expectations regarding a writer's responsibility to proofread text for spelling errors when using a word processor. Undergraduate students read an essay and completed a questionnaire regarding their perceptions of the author and the quality of the essay. We manipulated type of spelling error (no error, homophone error, non-homophone error) and information provided about the author's use of a spell checker (no information, author did not use a spell checker, author did use a spell checker). Participants' perceptions of the author's abilities and the quality of the essay suffered when the essay contained non-homophone spelling errors—errors that are typically flagged by a spell checker. Further, participants reported that they would be most likely to blame the writer rather than the spell checker for spelling errors contained in the text. These findings suggest that perceptions of both an author's abilities and the written products are affected by spelling errors. Even when supportive tools are available, the responsibility for producing error-free text remains with the author.