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Laterality

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https://www.readbyqxmd.com/read/28914148/dna-methylation-in-candidate-genes-for-handedness-predicts-handedness-direction
#1
Judith Schmitz, Robert Kumsta, Dirk Moser, Onur Güntürkün, Sebastian Ocklenburg
Handedness is a complex trait influenced by both genetic and non-genetic factors. Asymmetries of DNA methylation and gene expression in the developing foetus are thought to underlie its development. However, its molecular epigenetics are not well understood. We collected buccal cells from adult left- and right-handers (n = 60) to investigate whether epigenetic biomarkers of handedness can be identified in non-neuronal tissue. We associated DNA methylation in promoter regions of candidate genes with handedness direction...
September 15, 2017: Laterality
https://www.readbyqxmd.com/read/28899210/competitive-action-video-game-players-display-rightward-error-bias-during-on-line-video-game-play
#2
Andrew J Roebuck, Aurora J B Dubnyk, David Cochran, Regan L Mandryk, John G Howland, Victoria Harms
Research in asymmetrical visuospatial attention has identified a leftward bias in the general population across a variety of measures including visual attention and line-bisection tasks. In addition, increases in rightward collisions, or bumping, during visuospatial navigation tasks have been demonstrated in real world and virtual environments. However, little research has investigated these biases beyond the laboratory. The present study uses a semi-naturalistic approach and the online video game streaming service Twitch to examine navigational errors and assaults as skilled action video game players (n = 60) compete in Counter Strike: Global Offensive...
September 12, 2017: Laterality
https://www.readbyqxmd.com/read/28876165/development-of-material-specific-hemispheric-specialization-from-beginning-to-end
#3
Benjamin Gingras, Claude M J Braun
Disparity of verbal and performance intelligence (VIQ, PIQ) on the Wechsler scales of intelligence is a conceptually cluttered and empirically weak measure of hemispheric specialization (HS). However, in the context of life span research, it is the only measure that can be exploited meta-analytically with the lesion method from prenatal life to late senescence. We assembled 1917 cases with a unilateral cortical focal brain lesion occurring at all ages and a post-lesion VIQ and PIQ. Lesion locus, volume and side were documented for each case, as well as age at lesion onset, age at first symptoms and age at the IQ test, presence/absence of epilepsy, lesion aetiology, gender, date of publication or of transfer of medical file...
September 6, 2017: Laterality
https://www.readbyqxmd.com/read/28857672/neurophysiological-evidence-erps-for-hemispheric-processing-of-facial-expressions-of-emotions-evidence-from-whole-face-and-chimeric-face-stimuli
#4
Nikoleta Damaskinou, Dawn Watling
This study was designed to investigate the patterns of electrophysiological responses of early emotional processing at frontocentral sites in adults and to explore whether adults' activation patterns show hemispheric lateralization for facial emotion processing. Thirty-five adults viewed full face and chimeric face stimuli. After viewing two faces, sequentially, participants were asked to decide which of the two faces was more emotive. The findings from the standard faces and the chimeric faces suggest that emotion processing is present during the early phases of face processing in the frontocentral sites...
August 31, 2017: Laterality
https://www.readbyqxmd.com/read/28853331/the-effects-of-varying-levels-of-hemispheric-activation-on-episodic-memory
#5
Stephen Prunier, Stephen Christman, John Jasper
Bilateral saccadic eye movements enhance episodic memory retrieval; however, this usually only occurs for consistent-handed, not inconsistent-handed, individuals. It was hypothesized that inconsistent-handers begin closer to the peak of a Yerkes-Dodson-type inverted-U curve and increasing activation pushes them along the curve eventually decreasing performance, while consistent-handers start at a lower baseline and therefore increasing activation increases their performance. The current study tested this hypothesis by using hand clenching (grip strength) to increase activation at 5 different levels for both consistent- and inconsistent-handers...
August 30, 2017: Laterality
https://www.readbyqxmd.com/read/28829226/lateral-asymmetry-in-the-freely-occurring-behaviour-of-budgerigars-melopsittacus-undulatus-and-its-relation-to-cognitive-performance
#6
Angelo J d'Antonio-Bertagnolli, Matthew J Anderson
Hemispheric laterality and its provision of potential fitness advantages to aves is a widespread topic of research in budgerigars and other parrot species [e.g., Magat, M. & Brown, C. (2009). Laterality enhances cognition in Australian parrots. Proceedings of the Royal Society B: Biological Sciences, 276, 4155-4162]. In the current study, lateral preferences were tracked for 11 captive-reared budgerigars that subsequently underwent 2 cognitive problem-solving tests: a tool-use problem and a dig-discrimination task...
August 22, 2017: Laterality
https://www.readbyqxmd.com/read/28826331/lateralized-brain-functions-methods-in-human-and-non-human-species
#7
Marco Hirnstein
No abstract text is available yet for this article.
August 21, 2017: Laterality
https://www.readbyqxmd.com/read/28826315/the-truth-about-language-what-it-is-and-where-it-came-from
#8
Marc Brysbaert
No abstract text is available yet for this article.
August 21, 2017: Laterality
https://www.readbyqxmd.com/read/28803507/what-box-a-task-for-assessing-language-lateralization-in-young-children
#9
Nicholas A Badcock, Rachael Spooner, Jessica Hofmann, Atlanta Flitton, Scott Elliott, Lisa Kurylowicz, Louise M Lavrencic, Heather M Payne, Georgina K Holt, Anneka Holden, Owen F Churches, Mark J Kohler, Hannah A D Keage
The assessment of active language lateralization in infants and toddlers is challenging. It requires an imaging tool that is unintimidating, quick to setup, and robust to movement, in addition to an engaging and cognitively simple language processing task. Functional Transcranial Doppler Ultrasound (fTCD) offers a suitable technique and here we report on a suitable method to elicit active language production in young children. The 34-second "What Box" trial presents an animated face "searching" for an object...
August 13, 2017: Laterality
https://www.readbyqxmd.com/read/28786734/left-wings-to-the-left-posing-and-perceived-political-orientation
#10
Kari N Duerksen, Lorin J Elias
Images of individuals posing with the left cheek toward the camera are rated as more emotionally expressive than images with the right cheek toward the camera, which is theorized to be due to right hemisphere specialization for emotion processing. Liberals are stereotyped as being more emotional than conservatives. In the present study, we presented images of people displaying either leftward or rightward posing biases in an online task, and asked participants to rate people's perceived political orientation...
August 8, 2017: Laterality
https://www.readbyqxmd.com/read/28764593/right-ear-precedence-and-vocal-emotion-contagion-the-role-of-the-left-hemisphere
#11
Astrid Schepman, Paul Rodway, Louise Cornmell, Bethany Smith, Sabrina Lauren de Sa, Ciara Borwick, Elisha Belfon-Thompson
Much evidence suggests that the processing of emotions is lateralized to the right hemisphere of the brain. However, under some circumstances the left hemisphere might play a role, particularly for positive emotions and emotional experiences. We explored whether emotion contagion was right-lateralized, lateralized valence-specifically, or potentially left-lateralized. In two experiments, right-handed female listeners rated to what extent emotionally intoned pseudo-sentences evoked target emotions in them. These sound stimuli had a 7 ms ear lead in the left or right channel, leading to stronger stimulation of the contralateral hemisphere...
August 2, 2017: Laterality
https://www.readbyqxmd.com/read/28758841/associations-between-handedness-and-executive-function-in-upper-middle-aged-people
#12
Takeshi Hatta
Many studies have investigated the relationship between handedness and executive functioning using behavioural measures, although the exact nature of this relationship remains unclear. In this study, the relationship between handedness and executive function was examined using the D-CAT (Digit Cancellation Test) performances of 76 left-handed (42 men and 34 women) and 76 age-matched right-handed (42 men and 34 women) healthy community dwellers. The mean age of the participants was 62.7 years (SD = 10.3)...
July 31, 2017: Laterality
https://www.readbyqxmd.com/read/28756732/translation-cultural-adaption-and-test-retest-reliability-of-chinese-versions-of-the-edinburgh-handedness-inventory-and-waterloo-footedness-questionnaire
#13
Nan Yang, Gordon Waddington, Roger Adams, Jia Han
Quantitative assessments of handedness and footedness are often required in studies of human cognition and behaviour, yet no reliable Chinese versions of commonly used handedness and footedness questionnaires are available. Accordingly, the objective of the present study was to translate the Edinburgh Handedness Inventory (EHI) and the Waterloo Footedness Questionnaire-Revised (WFQ-R) into Mandarin Chinese and to evaluate the reliability and validity of these translated versions in healthy Chinese people. In the first stage of the study, Chinese versions of the EHI and WFQ-R were produced from a process of translation, back translation and examination, with necessary cultural adaptations...
July 31, 2017: Laterality
https://www.readbyqxmd.com/read/28724337/handedness-effects-of-imagined-fine-motor-movements
#14
Christopher M Donoff, Christopher R Madan, Anthony Singhal
Previous studies of movement imagery have found inter-individual differences in the ability to imagine whole-body movements. The majority of these studies have used subjective scales to measure imagery ability, which may be confounded by other factors related to effort. Madan and Singhal [2013. Introducing TAMI: An objective test of ability in movement imagery. Journal of Motor Behavior, 45(2), 153-166. doi: 10.1080/00222895.2013.763764 ] developed the Test of Ability in Movement Imagery (TAMI) to address these confounds by using a multiple-choice format with objectively correct responses...
July 19, 2017: Laterality
https://www.readbyqxmd.com/read/28707557/the-cheek-of-a-cheater-effects-of-posing-the-left-and-right-hemiface-on-the-perception-of-trustworthiness
#15
Matia Okubo, Kenta Ishikawa, Akihiro Kobayashi
Our cognitive mechanisms are designed to detect cheaters in social exchanges. However, cheater detection can be thwarted by a posed smile, which cheaters display with greater emotional intensity than cooperators. The present study investigated the role of hemifacial asymmetries in the perception of trustworthiness using face photographs with left and right cheek poses. Participants (N = 170) observed face photographs of cheaters and cooperators in an economic game. In the photographs, models expressed happiness or anger and turned slightly to the left or right to show their left or right cheeks to the camera...
July 14, 2017: Laterality
https://www.readbyqxmd.com/read/28701109/emotion-processing-in-persons-who-respond-vicariously-towards-others-in-pain-disinhibited-left-lateralized-neural-activity-for-threatening-expressions
#16
Melita J Giummarra, Govinda Poudel, P Amanda Niu, Michael E R Nicholls, Joanne Fielding, Antonio Verdejo-Garcia, Izelle Labuschagne
We investigated emotional processing in vicarious pain (VP) responders. VP responders report an explicit sensory and emotional feeling of pain when they witness another in pain, which is greater in magnitude than the empathic processing of pain in the general population. In Study 1, 31 participants completed a chimeric faces task, judging whether emotional chimera in the left, or right, visual field was more intense. VP responders took longer to judge emotionality than non-responders, and fixated more on the angry hemiface in the right visual field, whereas non-responder controls had no lateralized fixation bias...
July 12, 2017: Laterality
https://www.readbyqxmd.com/read/28670970/the-effect-of-monocular-deprivation-on-unihemispheric-sleep-in-light-and-dark-incubated-reared-domestic-chicks
#17
Angelica Quercia, Daniela Bobbo, Gian Gastone Mascetti
Unihemispheric sleep is an aspect of the cerebral lateralization of certain species of birds. During sleep, domestic chicks (Gallus gallus) show brief periods of monocular-unihemispheric sleep (Mo-Un sleep): one eye is open and the connected hemisphere is awaken while the other eye remains shut and the connected hemisphere sleeps. The time spent in Mo-Un sleep was investigated following a brief monocular deprivation (MD) in chicks hatched from eggs incubated in darkness and reared in light (D-L), incubated in light and reared in light (L-L) and incubated in darkness and reared in darkness (D-D)...
July 2, 2017: Laterality
https://www.readbyqxmd.com/read/28276877/evolutionary-and-mechanistic-drivers-of-laterality-a-review-and-new-synthesis
#18
Mallory L Wiper
Laterality, best understood as asymmetries of bilateral structures or biases in behaviour, has been demonstrated in species from all major vertebrate classes, and in many invertebrates, showing a large degree of evolutionary conservation across vertebrate groups. Despite the establishment of this phenomenon in so many species, however, the evolutionary and mechanistic study of laterality is uneven with numerous areas in this field requiring greater attention. Here, I present a partial review of how far the study of laterality has come, outlining previous pioneering work, I discuss the hypothesized costs and benefits of a lateralized brain and the suggested path of the evolution of laterality for populations and individuals...
November 2017: Laterality
https://www.readbyqxmd.com/read/28103762/cultural-and-biological-factors-modulate-spatial-biases-over-development
#19
Luisa Girelli, Chiara Valeria Marinelli, Giuseppe Grossi, Lisa S Arduino
Increasing evidence supports the contribution of both biological and cultural factors to visuospatial processing. The present study adds to the literature by exploring the interplay of perceptual and linguistic mechanisms in determining visuospatial asymmetries in adults (Experiment 1) and children (Experiment 2). In particular, pre-schoolers (3 and 5 year-olds), school-aged children (8 year-old), and adult participants were required to bisect different types of stimuli, that is, lines, words, and figure strings...
November 2017: Laterality
https://www.readbyqxmd.com/read/28041532/laterality-and-body-ownership-effect-of-handedness-on-experience-of-the-rubber-hand-illusion
#20
M Smit, D I Kooistra, I J M van der Ham, H C Dijkerman
Body ownership has mainly been linked to the right hemisphere and larger interhemispheric connectivity has been shown to be associated with greater right hemispheric activation. Mixed-handed participants tend to have more interhemispheric connectivity compared to extreme handed participants. The aim of this study was to examine whether feelings of ownership as assessed with the rubber hand illusion (RHI) are differentiated by handedness and differed between the left and right hand. Sinistrals-, dextrals-, and mixed-handed individuals (n = 63) were subjected to the RHI...
November 2017: Laterality
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