Medicine and Health Sciences Commons^™

Bimanual Reaching Across The Hemispace: Which Hand Is Yoked To Which?, Gavin Buckingham, Gordon Binsted, David Carey

Gavin Buckingham

When both hands perform concurrent goal-directed reaches, they become yoked to one another. To investigate the direction of this coupling (i.e., which hand is yoked to which), the temporal dynamics of bimanual reaches were compared with equivalent-amplitude unimanual reaches. These reaches were to target pairs located on either the left or right sides of space; meaning that in the bimanual condition, one hand's contralateral (more difficult) reach accompanied by the other hand's ipsilateral (easier) reach. By comparing which hand's difficult reach was improved more by the presence of the other hand's easier ipsilateral reach, we were able to demonstrate asymmetries …

Popular People Help Experts Predict Flu Outbreak?, Chiehwen Ed Hsu

Chiehwen Ed Hsu

Popular people are the trendsetters of society, especially when it comes to the next flu outbreak, according to preliminary research from Harvard University. The hypochondriac effect may have also exaggerated how predictive the friend group was, says Ed Hsu, associate professor of Public Health Informatics at the University of Texas. Those in the friend group are more likely to know someone who has the flu and hence may be more likely to think (and report) that they are coming down with it themselves.

The Influence Of Competing Perceptual And Motor Priors In The Context Of The Size-Weight Illusion, Gavin Buckingham, Melvyn Goodale

Gavin Buckingham

When lifting objects of identical mass but different sizes, people perceive the smaller objects as weighing more than the larger ones (the 'size-weight' illusion, SWI). While individual's grip and load force rates are rapidly scaled to the objects' actual mass, the magnitude of the force used to lift these SWI-inducing objects is rarely discussed. Here, we show that participants continue to apply a greater loading force to a large SWI-inducing cube than to a small SWI cube, lift after lift. These differences in load force persisted long after initial errors in grip and load force rates had been corrected. Interestingly, …

On The Number Of Trials Necessary For Stabilization Of Error-Related Brain Activity Across The Life Span, Jason Themanson, Matthew Pontifex, Mark Scudder, Michael Brown, Kevin O'Leary, Chien-Ting Wu, Charles Hillman

Jason R. Themanson, Ph.D

The minimum number of trials necessary to accurately characterize the error-related negativity (ERN) and the error positivity (Pe) across the life span was investigated using samples of preadolescent children, college-age young adults, and older adults. Event-related potentials and task performance were subsequently measured during a modified flanker task. Response-locked averages were created using sequentially increasing errors of commission in blocks of two. Findings indicated that across all age cohorts ERN and Pe were not significantly different relative to the within-participants grand average after six trials. Further, results indicated that the ERN and Pe exhibited excellent internal reliability in preadolescent children …

Devastatingly Human: An Analysis Of Registered Nurses’ Medication Error Accounts, Linda Treiber, Jackie Jones

Linda A. Treiber

Despite many safeguards, nurses make the majority of medication administration errors. The purpose of our research was to investigate the perceived causes for such errors and to better understand how nurses deal with them. We performed an interpretive analysis of 158 accounts by nurses who made self-identified medication errors. We found common themes among these accounts. First, although nurses admitted responsibility for errors, they simultaneously identified a variety of external contributing factors. Second, nurses’ accounts were often framed in terms of "being new," with the underlying background expectancy of inexperience. Third, emotionally devastating visceral responses to errors were common and …

Gating Of Vibrotactile Detection During Visually Guided Bimanual Reaches, Gavin Buckingham, David Carey, Francisco Colino, John Degrosbois, Gordon Binsted

Gavin Buckingham

It is far more difficult to detect a small tactile stimulation on a finger that is moving compared to when it is static. This suppression of tactile information during motion, known as tactile gating, has been examined in some detail during single-joint movements. However, the existence and time course of this gating has yet to be examined during visually guided multi-joint reaches, where sensory feedback may be paramount. The current study demonstrated that neurologically intact humans are unable to detect a small vibratory stimulus on one of their index fingers during a bimanual reach toward visual targets. By parametrically altering …

Lifting Without Seeing: The Role Of Vision In Perceiving And Acting Upon The Size Weight Illusion, Gavin Buckingham, Melvyn Goodale

Gavin Buckingham

BACKGROUND: Our expectations of an object's heaviness not only drive our fingertip forces, but also our perception of heaviness. This effect is highlighted by the classic size-weight illusion (SWI), where different-sized objects of identical mass feel different weights. Here, we examined whether these expectations are sufficient to induce the SWI in a single wooden cube when lifted without visual feedback, by varying the size of the object seen prior to the lift.

METHODOLOGY/PRINCIPAL FINDINGS: Participants, who believed that they were lifting the same object that they had just seen, reported that the weight of the single, standard-sized cube that they …

Not Enough Fruit And Vegetables Or Too Many Cookies, Candies, Salty Snacks, And Soft Drinks?, Roland Sturm, Deborah Cohen, Tom Farley, Molly Scott, R Bluthenthal

Roland Sturm

No abstract provided.

Manual De Ejercicio Para Adultos, Francisco Soto Mas

Francisco Soto Mas

Guía de ejercicio para adultos

Improving Risk Assessment With Suicidal Patients: A Preliminary Evaluation Of The Clinical Utility Of The Scale For Impact Of Suicidality - Management, Assessment And Planning Of Care (Sis-Map), Charles Nelson, Megan Johnston, Amresh Srivastava

Amresh Srivastava

Although a number of suicide risk assessment tools are available to clinicians, the high levels of suicide still evident in society suggest a clear need for new strategies in order to facilitate the prevention of suicidal behaviors. The present study examined the utilization of a new structured clinical interview called the Scale for Impact of Suicidality Management, Assessment and Planning of Care (SIS-MAP). SIS-MAP ratings were obtained from a group of incoming psychiatric patients over a 6-month period at Regional Mental Health Care, St. Thomas, Ontario. A canonical discriminant function analysis resulted in a total 74.0% of original grouped cases …

Testing Self-Efficacy As A Pathway That Supports Self Care Among Family Caregivers In A Psychoeducational Intervention, Marie Savundranayagam, M. Brintnall-Peterson

Marie Y Savundranayagam

This study investigated the extent to which a psychoeducational intervention supports family-centered care by influencing health risk and self-care behaviors of caregivers of individuals with Alzheimer's disease (N = 325). Moreover, this study investigated the extent to which changes in self-efficacy explained changes in health risk and self-care behaviors. Data were analyzed using repeated measures and multivariate analysis of variance and multiple regression. Qualitative written accounts of the impact of the intervention augmented the quantitative findings. The study's findings revealed that family caregivers experienced reductions in health risk behaviors and improvements in exercise, stress management, and relaxation activities as a …

The Relation Of Aerobic Fitness To Neuroelectric Indices Of Cognitive And Motor Task Preparation, Jason Themanson, Keita Kamijo, Kevin O'Leary, Matthew Pontifex, Charles Hillman

Jason R. Themanson, Ph.D

The relation of aerobic fitness to task preparation was examined in a sample of young adults separated into higher- and lower-fit groups according to their maximal oxygen consumption. Participants performed a modified Sternberg working memory task under speed and accuracy instructions while measures of task performance and contingent negative variation (CNV) were collected. Analyses revealed no significant fitness differences between groups on task performance measures. However, frontal CNVamplitude was significantly larger for lower-fit participants compared to higher-fit participants during the speed instructions, an effect not found for the accuracy instructions. These results suggest that lower-fit individuals may rely to a …

Consumption Smoothing And Hiv/Aids: The Case Of Two Communities In South Africa, Sebastian Linnemayr

Sebastian Linnemayr

HIV/AIDS threatens to overstretch the already frail informal safety nets in countries heavily affected by the epidemic, potentially making it difficult for households with HIV‐positive members to keep up appropriate consumption levels when experiencing shocks. These households may, in addition, face exclusion from informal insurance networks because of widespread stigmatization. Surprisingly, the resilience of informal networks to HIV‐related shocks and their uncertain worth for afflicted households in particular have not been empirically tested to date. Using 3 years of a novel panel data set from two poor South African communities experiencing HIV‐related illnesses and deaths, we investigate the ability of …

Lifting Without Seeing: The Role Of Vision In Perceiving And Acting Upon The Size‐Weight Illusion, Gavin Buckingham, Melvyn Goodale

Gavin Buckingham

Our expectations of an object’s heaviness not only drive our fingertip forces, but also our perception of heaviness. This effect is highlighted by the classic size-weight illusion (SWI), where different‐sized objects of identical mass feel different weights (Charpentier, 1891) long after any initial errors in the application of fingertip forces have been corrected (Flanagan & Beltzner, 2000).

Here, we examined whether our expectations about the weight of an upcoming lift are sufficient to induce the SWI in a single wooden cube when lifted without visual feedback, by varying the size of the object seen prior to the lift during a …

The Ces-D In Chinese American Women: Construct Validity, Diagnostic Validity For Major Depression, And Cultural Response Bias., Z Li, M Hicks

Madelyn Hsiao-Rei Hicks

Previous studies of the Center for Epidemiologic Studies Depression Scale (CES-D) in Chinese Americans describe internal reliability and factor structure. We report CES-D construct validity and diagnostic validity for major depression in a probability sample of 168 community-dwelling Chinese American women. Internal consistency was satisfactory (Cronbach's alpha=0.86). Good construct validity was indicated by significantly higher mean CES-D scores for respondents who reported lower social support, worse self-perceived general health, or stressful life events, including intimate partner violence. Cultural response bias was found, with positively-stated CES-D items (e.g. "I was happy") producing higher depression scores in immigrants and subjects who preferred …

Laterality, Perception, And Action During The Size-Weight Illusion, Gavin Buckingham, Nathalie Ranger, Melvyn Goodale

Gavin Buckingham

In the classic size-weight illusion (SWI), a small object will feel heavier than an larger object of equal weight (Charpentier, 1891). Individuals continue to perceive this illusory difference in weight long after their gripping and lifting forces have scaled to the actual, identical, mass of the illusion-inducing stimuli (Flanagan & Beltzner, 2000).

The independence of our weight perception and fingertip force application has only been quantified in the right hand of right-handers. The immunity to this perceptual illusion may be affected by manual asymmetries (e.g., Gonzalez, Ganel & Goodale, 2006).

We examined perception of heaviness and fingertip force scaling in …

Impact Of Role Discrepancies On Caregiver Burden Among Spouses, Marie Savundranayagam, R. Montgomery

Marie Y Savundranayagam

Using caregiver identity theory, the authors investigated whether role discrepancies mediated the relationships between illness-related stressors (activities of daily living [ADLs] limitations and problem behaviors) and burden (stress, relationship, and objective burden) for spouse caregivers. Participants completed measures of identity standards for spouse and caregiver roles and behaviors, burden, assistance with ADLs, and problem behaviors. Structural equation modeling analyses revealed that role discrepancies completely mediated the relationships between ADLs and stress and relationship burden. Although role discrepancies mediated the relationships between problem behaviors and all forms of burden, there were direct relationships between problem behaviors and burden. Finally, participants who …

Vampire Island, Anastasia Tsaliki

Anastasia Tsaliki

Participation in this documentary directed by Julian Thomas and produced by Electric Sky for History Channel International.

"The legend of blood sucking vampires has captured peoples’ imagination for generations. Mysterious tales of the undead rising from their coffins to terrorise the living and drain their blood are the stuff of horror movies and novels. But a crack team of archaeologists and forensic scientists have uncovered hard evidence for the existence of the legend – a legend that continues to haunt communities in the present day…"

Soda Taxes, Soft Drink Consumption, And Children's Body Mass Index, Roland Sturm, L Powell, J Chriqui, F Chaloupka

Roland Sturm

No abstract provided.

Factors Behind Hiv Testing Practices Among Canadian Aboriginal Peoples Living Off-Reserve, Treena Orchard, C. Mcinnes, K. Fernandes, M. Clement, M. Gilbert, V. Lima, J. Montaner, R. Hogg

Dr. Treena Orchard

The objective of this study was to examine factors associated with HIV testing among Aboriginal peoples in Canada who live off-reserve. Data were drawn for individuals aged 15–44 from the Aboriginal Peoples Survey (2001), which represents a weighed sample of 520,493 Aboriginal men and women living off-reserve. Bivariable analysis and logistic regression were used to identify factors associated with individuals who had received an HIV test within the past year. In adjusted multivariable analysis, female gender, younger age, unemployment, contact with a family doctor or traditional healer within the past year, and “good” or “fair/poor” self-rated health increased the odds …

Insert Discourse: Rectal Douching Among Young Hiv-Positive And Hiv-Negative Gay Men In Vancouver, Canada, A. Schilder, Treena Orchard, C. Buchner, S. Strathdee, R. Hogg

Dr. Treena Orchard

Douching is a common practice among certain groups of women and MSM, and it is conducted for the purpose of cleanliness as part of bodily hygiene maintenance. Although there has been considerable research about female vaginal douching, understandings of rectal douching (RD) for MSM are limited. In the epidemiological and medical literature, RD is presented as a behaviour that removes beneficial bacteria and the surface epithelium layer of the colon, which can, potentially, increase the risk of HIV transmission in MSM. The paucity of research on male douching practices is curious given the primacy of anal sex in HIV prevention …