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«Effects of Handedness on Affective Lateralization: a Divided Visual-Field Study Kevin Alastair M. Tan Carnegie Mellon University Department of ...»

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In conclusion, this study may have found evidence for opposite affective lateralization between right- and left-handers. Past studies using similar DVF paradigms have been inconclusive, and the wider implications of this study’s findings remain unclear. The results of this study must be considered alongside its methodological limitations and overall lack of statistical robustness. In the future, larger and more even participant groups would be prudent for achieving statistical robustness. The use of simpler stimuli (i.e. faces instead of scenes) would also be a better choice in regards to consistency and validity. Additionally, the physical position of the participants during the experiment should be better controlled for, as alterations could significantly compromise the separation of the visual fields. Furthermore, the experiment was conducted in multiple different locations at different times-of-day. While lighting and noise levels were controlled for, many others were not, such as table height, seat height, and room temperature. These uncontrolled factors may have influenced results. Lastly, handedness should be better qualified; handedness groups were assigned through self-identification, not

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Figure 2 Matched-pair stimuli used for A) Threat-detection condition B) Positive-affect condition. Left-hand images show neutral stimuli, and right-hand images show matched emotional stimuli.

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Figure 4 Response time measured in milliseconds. Comparison of performance between handedness, visual field, stimuli type, and experimental condition. For emotional stimuli, right-handers had a RH/LVF performance advantage in the threat-detection condition, and a LH/RVF advantage in the positive affect condition. This pattern was reversed for left-handers. For neutral stimuli, both handedness groups had a LH/RVF performance advantage in both conditions


Table 1 Full results of multivariate analysis of covariance (MANCOVA). Dependent variables: response time and accuracy. Fixed factors: handedness, visual field, stimuli type, and experimental condition. Covariates: Sex, Age, and Major.

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References Brookshire, Geoffrey, and Daniel Casasanto. "Motivation and Motor Control: Hemispheric Specialization for Motivation Reverses with Handedness." PLoS ONE (2011): n. pag. Print.

Bryden, MP, T. Free, S. Gagne, and P. Groff. "Handedness Effects in the Detection of Dichoticallypresented Words and Emotions." Cortex 27.2 (1991): n. pag. Print.

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Effects." Neuropsychologia 32.7 (1994): n. pag. Print.

Davidson, Richard J. "Anterior Cerebral Asymmetry and the Nature of Emotion." Brain and Cognition 20.1 (1992): 125-51. Print.

Elias, L., MP Bryden, and MB Bulman-Fleming. "Footedness Is a Better Predictor than Is Handedness of Emotional Lateralization." Neuropsychologia 36.1 (1998): 37-43. Print.

Everhart, D. Erik, David W. Harrison, and W. David Crews. "Hemispheric Asymmetry As A Function

Of Handedness-Perception Of Facial Affect Stimuli." Perceptual and Motor Skills 82.1 (1996):

264-66. Print.

Gasparrini, W. G., P. Satz, K. Heilman, and F. L. Coolidge. "Hemispheric Asymmetries of Affective Processing as Determined by the Minnesota Multiphasic Personality Inventory." Journal of Neurology, Neurosurgery & Psychiatry 41.5 (1978): 470-73. Print.

Goldstein, Kurt. The Organism: A Holistic Approach to Biology Derived from Pathological Data in Man. New York: American Book, 1939. Print.

Kinsbourne, Marcel. "The Cerebral Basis of Lateral Asymmetries in Attention." Acta Psychologica 33 (1970): n. pag. Print.

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McFARL, Richard A., and And Robert Kennison. "Handedness Affects Emotional Valence Asymmetry." Perceptual and Motor Skills 68.2 (1989): 435-41. Print.

Motz, BA, KH James, and TA Busey. "The Lateralizer: A Tool for Students to Explore the Divided Brain." Teaching In The Laboratory 36 (2012): n. pag. Print.

Natale, Michael, Raquel E. Gur, and Ruben C. Gur. "Hemispheric Asymmetries in Processing Emotional Expressions." Neuropsychologia 21.5 (1983): 555-65. Print.

Northoff, Georg. "Functional Dissociation between Medial and Lateral Prefrontal Cortical Spatiotemporal Activation in Negative and Positive Emotions: A Combined FMRI/MEG Study." Cerebral Cortex 10.1 (2000): n. pag. Print.

Perria, P., G. Rosadini, and GF Rossi. "Determination of Side of Cerebral Dominance with Amobarbital." Archives of Neurology 4 (1961): n. pag. Print.

Rodway, Paul, Lynn Wright, and Scott Hardie. "The Valence-specific Laterality Effect in Free Viewing Conditions: The Influence of Sex, Handedness, and Response Bias." Brain and Cognition 53.3 (2003): 452-63. Print.

Sackiem, HA, MS Greenberg, and AL Weiman. "Hemispheric Asymmetry in the Expression of Positive and Negative Emotions: Neurologic Evidence." Archives of Neurology38.4 (1982): n.

pag. Print.

Shamay-Tsoory, Simone G., Michal Lavidor, and Judith Aharon-Peretz. "Social Learning Modulates the Lateralization of Emotional Valence." Brain and Cognition 67.3 (2008): 280

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Silberman, Edward K., and Herbert Weingartner. "Hemispheric Lateralization of Functions

Related to Emotion." Brain and Cognition 5.3 (1986): 322-53. Print.

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