The contributions of vision and haptics to reaching and grasping

Sherpa Romeo green journal: open accessThis review aims to provide a comprehensive outlook on the sensory (visual and haptic) contributions to reaching and grasping. The focus is on studies in developing children, normal, and neuropsychological populations, and in sensory-deprived individuals. Studies have suggested a right-hand/left-hemisphere specialization for visually guided grasping and a left-hand/right-hemisphere specialization for haptically guided object recognition. This poses the interesting possibility that when vision is not available and grasping relies heavily on the haptic system, there is an advantage to use the left hand. We review the evidence for this possibility and dissect the unique contributions of the visual and haptic systems to grasping. We ultimately discuss how the integration of these two sensory modalities shape hand preference.Ye

Grasping without sight: insights from the congenitally blind

Sherpa Romeo green journal: open accessWe reach for and grasp different sized objects numerous times per day. Most of these movements are visually-guided, but some are guided by the sense of touch (i.e. haptically-guided), such as reaching for your keys in a bag, or for an object in a dark room. A marked right-hand preference has been reported during visually-guided grasping, particularly for small objects. However, little is known about hand preference for haptically-guided grasping. Recently, a study has shown a reduction in right-hand use in blindfolded individuals, and an absence of hand preference if grasping was preceded by a short haptic experience. These results suggest that vision plays a major role in hand preference for grasping. If this were the case, then one might expect congenitally blind (CB) individuals, who have never had a visual experience, to exhibit no hand preference. Two novel findings emerge from the current study: first, the results showed that contrary to our expectation, CB individuals used their right hand during haptically-guided grasping to the same extent as visually-unimpaired (VU) individuals did during visually-guided grasping. And second, object size affected hand use in an opposite manner for haptically- versus visually-guided grasping. Big objects were more often picked up with the right hand during hapticallyguided, but less often during visually-guided grasping. This result highlights the different demands that object features pose on the two sensory systems. Overall the results demonstrate that hand preference for grasping is independent of visual experience, and they suggest a left-hemisphere specialization for the control of grasping that goes beyond sensory modalityYe

Hand preference across the lifespan: effects of end-goal, task nature, and object location

Sherpa Romeo green journal: open accessIn the present study we investigate age-related changes in hand preference for grasping and the influence of task demands on such preference. Children (2–11), young-adults (17–28) and older-adults (57–90 ) were examined in a grasp-to-eat and a grasp-to-construct task. The end-goal of these tasks was different (eat vs.construct) as was the nature of the task(unimanual vs. bimanual). In both tasks,ipsilateral and contralateral grasps were analyzed. Results showed a right-hand preference that did not change with age. Across the three age groups, a more robust right-hand preference was observed for the unimanual, grasp-to-eat task. To disentangle if the nature (unimanual) or the end-goal (grasp-to-eat) was the driver of the robust right-hand preference,a followup experiment was conducted.Young-adult participants completed a unimanual grasp-to-place task. This was contrasted with the unimanual grasp-to-eat task and the bimanual grasp-to-construct task.Rates of hand preference for the grasp-to-eat task remained the highest when compared to the other two grasping tasks. Together, the results demonstrate that hand preference remains stable from childhood to older adulthood, and they suggest that a left hemisphere specialization exists for grasping, particularly when bringing food to the mouth.Ye

Evidence for right-handed feeding biases in a left-handed population

Sherpa Romeo green journal. Permission to archive accepted author manuscript.We have recently shown that actions with similar kinematic requirements but different end-state goals may be supported by distinct neural networks. Specifically, we demonstrated that when right-handed individuals reach-to-grasp food items with intent to eat, they produce smaller maximum grip apertures (MGAs) than when they grasp the same item with intent to place it in a location near the mouth. This effect was restricted to right-handed movements; left-handed movements showed no difference between tasks. The current study investigates whether (and to which side) the effect may be lateralized in left-handed individuals. Twenty-one self-identified left-handed participants grasped food items of three different sizes while grasp kinematics were captured via an Optotrak Certus motion capture array. A main effect of task was identified wherein the grasp-to-eat action generated significantly smaller MGAs than did the grasp-to-place action. Further analysis revealed that similar to the findings in right-handed individuals, this effect was significant only during right-handed movements. Upon further inspection however, we found individual differences in the magnitude and direction of the observed lateralization. These results underscore the evolutionary significance of the grasp-to-eat movement in producing population-level right-handedness in humans as well as highlighting the heterogeneity of the left-handed population.Ye

Vision and haptics : how sensorimotor interactions influence grasping

The purpose of this thesis was to investigate the sensory contributions to hand preference for grasping. While numerous studies have investigated this preference for visually-guided grasping (a left-hemisphere specialization), very few have documented it during haptically-guided actions (a right-hemisphere specialization). In a series of four studies, participants (healthy adults, congenitally blind, and children) were asked to replicate 3D-block models from a tabletop of blocks while the hand used for grasping was recorded. Overall the results showed a right-hand preference for grasping independent of age and visual experience (but not sensory modality). Haptics played a modest, yet significant, role in modulating hand preference, as there was a significant reduction in right-hand use in the absence of vision (i.e. during haptically-guided grasping). Because the left hand was never used more than 50% of the time, these findings support the theory of a default right-hand/left-hemisphere specialization for grasping that is modulated by haptics.Natural Sciences and Engineering Research Council of Canada (Fund # 14367 and Canada Graduate Scholarship - Master's Program), University of Lethbridge, Alberta Innovates - Health Solutions (AIHS) Sustainability Fund (Fund # G00002541

Adherence to Antimicrobial Inhalational Anthrax Prophylaxis among Postal Workers, Washington, D.C., 2001

In October 2001, two envelopes containing Bacillus anthracis spores were processed at the Washington, D.C., Processing and Distribution Center of the U.S. Postal Service; inhalational anthrax developed in four workers at this facility. More than 2,000 workers were advised to complete 60 days of postexposure prophylaxis to prevent inhalational anthrax. Interventions to promote adherence were carried out to support workers, and qualitative information was collected to evaluate our interventions. A quantitative survey was administered to a convenience sample of workers to assess factors influencing adherence. No anthrax infections developed in any workers involved in the interventions or interviews. Of 245 workers, 98 (40%) reported full adherence to prophylaxis, and 45 (18%) had completely discontinued it. Experiencing adverse effects to prophylaxis, anxiety, and being <45 years old were risk factors for discontinuing prophylaxis. Interventions, especially frequent visits by public health staff, proved effective in supporting adherence

Live. Tell. Resist.

This edition of First-Gen Voices features the stories and work of 24 first-generation college students at multiple higher education institutions. The aim is to disseminate a story about us, for us, and consequently, the dominant cultures that have yet to learn from our power

Coronary computed tomography angiography investigation of the association between left main coronary artery bifurcation angle and risk factors of coronary artery disease

To explore the association between the left main coronary artery bifurcation angle and common atherosclerotic risk factors with regard to the development of coronary artery disease (CAD) using coronary computed tomography angiography (CCTA). A retrospective review of 196 CCTA cases (129 males, 67 females, mean age 58 ± 10.5 years) was conducted. The bifurcation angle between the left anterior descending (LAD) and left circumflex (LCx) was measured on two-dimensional (2D) and three-dimensional (3D) reconstructed images and the type of plaque and degree of lumen stenosis was assessed to determine the disease severity. An association between bifurcation angle and patient risk factors [gender, body mass index (BMI), hypertension, cholesterol, diabetes, smoking and family history] of CAD was also assessed to demonstrate the relationship between these variables. The mean bifurcation angle between the LAD and LCx was 79.40° ± 22.97°, ranging from 35.5° to 178°. Gender and BMI were found to have significant associations with bifurcation angle. Males were at 2.07-fold greater risk of having a >80° bifurcation angle and developing CAD than females (P = 0.003), and patients with high BMI (>25 kg/m2) were 2.54-fold more likely to have a >80° bifurcation angle than patients with a normal BMI (P = 0.001) and thus were at greater risk of developing CAD. There is a direct relationship between the left main coronary artery bifurcation angle and patient gender and BMI. Measurement of the bifurcation angle should be incorporated into clinical practice to identify patients at high risk of developing CAD

The Lantern, 2013-2014

• Strikes • Pietro di Venezia • To the Lover of Small Things • Jim\u27s Big Day • Akademiks • Redamancy • A Love Poem for Arctia Caja • Mother River • The Lyrics to Your Song • Nerves • Gemini Season • White Interface • The Last Time I Played with Dolls • The Mechanic • My Goldfish • Put Down Your Hammer • Strip • Hollywood • Identity • The Grey Zone • Sophia • When I Became a Poet • Unbroken • The Veteran Aeronaut • I Have Running Water but They had the Stars • Not A Nigga • Mother, Adam, Eve • From Fragile Seeds: A Palindrome • Conspiring, The Spires • Finally Working Out What Goes Where (God, For Example, is in His Kingdom) • Identity Crisis • Affection • Patience • An Enchanting Lost Cause • False Starts • Soggy Rice, Lukewarm Water • The Glow • Heat • 9-14 • Filigree • Diane Arbus • Touched • Dying Alive • Just Another Drunkard on the Train • Dinner • The French Legionnaire • Conspiracy and Theory • 1249am • Colored Pencils • Sea Glass • Roundtrip • The Muse Heard Music • Lacrimosa • The Allegory of the Maze • The Stars on Stuart Road • To Isabella • For Want of a Potato Chip • Termite Nests • Saving a Rose • Today and Yesterday • A Foggy New York • Cat; Wurtzburg • Embrace • Faces • Geisha • Pacis Leo • Patterns • Te-Whanganui-a-Tara (The Dock)https://digitalcommons.ursinus.edu/lantern/1180/thumbnail.jp