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Laterality

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https://www.readbyqxmd.com/read/29141494/influence-of-script-direction-on-word-processing-modes-in-left-and-right-visual-fields
#1
Eric Siéroff, Yael Slama
Word processing in left (LVF) and right (RVF) visual fields may be affected by left hemisphere activation during reading and by script direction. We evaluated the effect of script direction by presenting words in left-to-right (French) and right-to-left (Hebrew) scripts to bilingual French participants. Words of different lengths were presented in the LVF and the RVF in a naming task. Results showed (1) a stronger word length effect in the LVF than in the RVF in French, and no difference of word length effect between LVF and RVF in Hebrew; (2) a first-letter advantage only in the LVF in French and in the RVF in Hebrew, showing an effect of script direction on letter processing; and (3) a stronger advantage of external over internal letters in words presented in the LVF than in the RVF for both languages, showing a left hemisphere influence on letter activation...
November 15, 2017: Laterality
https://www.readbyqxmd.com/read/29141493/the-effect-of-unimodal-affective-priming-on-dichotic-emotion-recognition
#2
Daniel Voyer, Daniel Myles
The present report concerns two experiments extending to unimodal priming the cross-modal priming effects observed with auditory emotions by Harding and Voyer [(2016). Laterality effects in cross-modal affective priming. Laterality: Asymmetries of Body, Brain and Cognition, 21, 585-605]. Experiment 1 used binaural targets to establish the presence of the priming effect and Experiment 2 used dichotically presented targets to examine auditory asymmetries. In Experiment 1, 82 university students completed a task in which binaural targets consisting of one of 4 English words inflected in one of 4 emotional tones were preceded by binaural primes consisting of one of 4 Mandarin words pronounced in the same (congruent) or different (incongruent) emotional tones...
November 15, 2017: Laterality
https://www.readbyqxmd.com/read/29098936/facial-asymmetry-in-the-resting-state-reflects-anxiety-status-on-young-males
#3
Alessio Rossi, Damiano Formenti, Luca Cavaggioni, Alice Morgante, Palmina Caruso, Marco Gargano, Nicola Ludwig, Isabella Merzagora, Giampietro Alberti
Facial asymmetry is considered a marker of psychological, emotional and physiological distress, while anxiety is a behavioural, psychological and physiological response to a threat to well-being. Since individuals respond to anxiety with specific patterns (e.g., muscular tension), it is reasonable to hypothesize that anxiety could contribute to facial tension and therefore facial asymmetry. Instead, since facial asymmetry is perceived as "unpleasant" from peers, its presence may be a hindrance to social adaptation contributing to generate anxiety...
November 3, 2017: Laterality
https://www.readbyqxmd.com/read/29072115/fearful-asymmetry-bouillaud-dax-broca-and-the-localization-of-language-paris-1825-1879
#4
Michael C Corballis
No abstract text is available yet for this article.
October 26, 2017: Laterality
https://www.readbyqxmd.com/read/28914148/dna-methylation-in-candidate-genes-for-handedness-predicts-handedness-direction
#5
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
#6
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
#7
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
#8
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
#9
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/28276877/evolutionary-and-mechanistic-drivers-of-laterality-a-review-and-new-synthesis
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/27997277/opposite-brain-laterality-in-analogous-auditory-and-visual-tests
#13
Leif Oltedal, Kenneth Hugdahl
Laterality for language processing can be assessed by auditory and visual tasks. Typically, a right ear/right visual half-field (VHF) advantage is observed, reflecting left-hemispheric lateralization for language. Historically, auditory tasks have shown more consistent and reliable results when compared to VHF tasks. While few studies have compared analogous tasks applied to both sensory modalities for the same participants, one such study by Voyer and Boudreau [(2003). Cross-modal correlation of auditory and visual language laterality tasks: a serendipitous finding...
November 2017: Laterality
https://www.readbyqxmd.com/read/27973985/relationship-between-sustained-unilateral-hand-clench-emotional-state-line-bisection-performance-and-prefrontal-cortical-activity-a-functional-near-infrared-spectroscopy-study
#14
Ruth E Propper, Kyle Dodd, Stephen D Christman, Tad T Brunyé
Sustained unilateral hand clenching alters perceptual processing and affective/motivational state, with these alterations presumed to reflect increased hemispheric activity contralateral to the side of motor movement. However, data from electroencephalographic and imaging studies are contradictory regarding the relationship between sustained hand clenching and brain activity. In order to investigate the relationship between brain activity, sustained unilateral hand clenching, and changes in affect and perceptual processing, frontal hemispheric activity was measured via functional near-infrared spectroscopy (fNIRS), using derived O2Hb prior to, during, and post-sustained unilateral hand clench...
November 2017: Laterality
https://www.readbyqxmd.com/read/27973982/pupil-size-asymmetry-is-a-physiologic-trait-related-to-gender-attentional-function-and-personality
#15
William D Poynter
A small difference in the size of the two pupils is common in healthy individuals, a condition termed benign or physiologic anisocoria (BA). Past research indicates that BA is probably caused by asymmetry in sympathetic nervous system (SNS) function [e.g., Rosenberg (2008). Physiologic anisocoria: A manifestation of a physiologic sympathetic asymmetry. Neuro-Ophthalmology, 32, 147-149]. This study is the first to show that BA varies with psychological factors linked to brain asymmetry and autonomic arousal, including gender, attention, and personality...
November 2017: Laterality
https://www.readbyqxmd.com/read/27666522/turning-into-frogs-asymmetry-in-forelimb-emergence-and-escape-direction-in-metamorphosing-anurans
#16
Luigi Zechini, Alison Lilley, Emily Waddell, Thomas J Burns, J Roger Downie, Patrick T Walsh
There is considerable debate about the pattern and origin of laterality in forelimb emergence and turning behaviour within amphibians, with the latter being poorly investigated in tadpoles around metamorphic climax. Using 6 species of metamorphosing anurans, we investigated the effect of asymmetrical spiracle location, and disturbance at the time of forelimb emergence, on the pattern of forelimb emergence. Turning behaviour was observed to assess whether motor lateralization occurred in non-neobatrachian anurans and was linked to patterns of forelimb emergence...
November 2017: Laterality
https://www.readbyqxmd.com/read/27951740/cultural-influence-on-directional-tendencies-in-children-s-drawing
#17
Marine Portex, Jean-Noël Foulin, Bertrand Troadec
The present study was aimed at investigating how print experience as a cultural factor influences directional tendencies in children's drawing in the interplay with biomechanical (hand), syntactic (shape orientation) and semantic (shape meaning) factors. Eighty-eight right-handed children from three literacy/age groups (preliterate, first graders and third graders) had to copy a geometrical shape adapted from the Rey-Osterrieth complex figure. The shape was presented alternatively leftward and rightward, while using both dominant (right) and non-dominant (left) hands...
September 2017: Laterality
https://www.readbyqxmd.com/read/27852139/the-handedness-of-historiated-spiral-columns
#18
Robert Couzin
Trajan's Column in Rome (AD 113) was the model for a modest number of other spiral columns decorated with figural, narrative imagery from antiquity to the present day. Most of these wind upwards to the right, often with a congruent spiral staircase within. A brief introductory consideration of antique screw direction in mechanical devices and fluted columns suggests that the former may have been affected by the handedness of designers and the latter by a preference for symmetry. However, for the historiated columns that are the main focus of this article, the determining factor was likely script direction...
September 2017: Laterality
https://www.readbyqxmd.com/read/27759494/effects-of-induced-placental-and-fetal-growth-restriction-size-at-birth-and-early-neonatal-growth-on-behavioural-and-brain-structural-lateralization-in-sheep
#19
Damien Seth Hunter, Susan J Hazel, Karen L Kind, Hong Liu, Danila Marini, Lynne C Giles, Miles J De Blasio, Julie A Owens, Julia B Pitcher, Kathryn L Gatford
Poor perinatal growth in humans results in asymmetrical grey matter loss in fetuses and infants and increased functional and behavioural asymmetry, but specific contributions of pre- and postnatal growth are unclear. We therefore compared strength and direction of lateralization in obstacle avoidance and maze exit preference tasks in offspring of placentally restricted (PR: 10M, 13F) and control (CON: 23M, 17F) sheep pregnancies at 18 and 40 weeks of age, and examined gross brain structure of the prefrontal cortex at 52 weeks of age (PR: 14M, 18F; CON: 23M, 25F)...
September 2017: Laterality
https://www.readbyqxmd.com/read/27728992/valence-and-arousal-influence-the-late-positive-potential-during-central-and-lateralized-presentation-of-images
#20
Aminda J O'Hare, Ruth Ann Atchley, Keith M Young
The motivated attention network is believed to be the system that allocates attention toward motivationally relevant, emotional stimuli in order to better prepare an organism for action [Lang, P. J., Bradley, M. M., & Cuthbert, B. N. (1997). Motivated attention: Affect, activation, and action. In P. J. Lang, R. F. Simons, M. Balaban, & R. Simons (Eds.), Attention and orienting: Sensory and motivational processes (pp. 97-135). Psychology Press]. The late positive potential (LPP), an event-related potential (ERP) that is a manifestation of the motivated attention network, has not been found to reliably differentiate the valence of emotionally relevant stimuli...
September 2017: Laterality
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