An Electrophysiological Study of Hemispheric Asymmetry in Recognizing Two Korean Scripts: The Effects of Hanja Proficiency

It has been shown that selective attention enhances the activity in visual regions associated with stimulus processing. The left hemisphere seems to have a prominent role when non-spatial attention is directed towards specific stimulus features (e.g., color, spatial frequency). The present electrophysiological study investigated the time course and neural correlates of object-based attention, under the assumption of left-hemispheric asymmetry. Twenty-nine right-handed participants were presented with 3D graphic images representing the shapes of different object categories (wooden dummies, chairs, structures of cubes) which lacked detail. They were instructed to press a button in response to a target stimulus indicated at the beginning of each run. The perception of non-target stimuli elicited a larger anterior N2 component, which was likely associated with motor inhibition. Conversely, target selection resulted in an enhanced selection negativity (SN) response lateralized over the left occipito-temporal regions, followed by a larger centro-parietal P300 response. These potentials were interpreted as indexing attentional selection and categorization processes, respectively. The standardized weighted low-resolution electromagnetic tomography (swLORETA) source reconstruction showed the engagement of a fronto-temporo-limbic network underlying object-based visual attention. Overall, the SN scalp distribution and relative neural generators hinted at a left-hemispheric advantage for non-spatial object-based visual attention.

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An Electrophysiological Study Of The Effects Of Propofol On Native Neuronal Ligand-Gated Ion Channels

Clinical and Experimental Pharmacology and Physiology ◽

10.1046/j.1440-1681.2001.3469.x ◽

2001 ◽

Vol 28 (5-6) ◽

pp. 451-458 ◽

Cited By ~ 1

Author(s):

Debra Patten ◽

Graham R Foxon ◽

Keith F Martin ◽

Robert F Halliwell

Keyword(s):

Ion Channels ◽

Electrophysiological Study ◽

Gated Ion Channels ◽

Ligand Gated Ion Channels

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Botulinum toxin serotype A and C effect on motor unit in humans: An electrophysiological study by motor unit number estimate

Electroencephalography and Clinical Neurophysiology ◽

10.1016/s0013-4694(97)88798-x ◽

1997 ◽

Vol 103 (1) ◽

pp. 171

Author(s):

R Eleopra

Keyword(s):

Botulinum Toxin ◽

Motor Unit ◽

Electrophysiological Study ◽

Serotype A ◽

Motor Unit Number Estimate

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Plasma catecholamines levels during low energy internal cardioversion for persistent atrial fibrillation and during electrophysiological study for ventricular tachyarrhythmias

EP Europace ◽

10.1016/s1099-5129(01)80084-2 ◽

2001 ◽

Vol 2 ◽

pp. A9-A9

Keyword(s):

Atrial Fibrillation ◽

Electrophysiological Study ◽

Plasma Catecholamines ◽

Persistent Atrial Fibrillation ◽

Low Energy ◽

Ventricular Tachyarrhythmias ◽

Internal Cardioversion

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Individual Differences and Hemispheric Asymmetry While Processing Emotional Words

Journal of Individual Differences ◽

10.1027/1614-0001/a000137 ◽

2014 ◽

Vol 35 (3) ◽

pp. 137-143 ◽

Cited By ~ 1

Author(s):

Lindsay M. Niccolai ◽

Thomas Holtgraves

Keyword(s):

Individual Differences ◽

Hemispheric Asymmetry ◽

Past Research ◽

Decision Task ◽

Depression And Anxiety ◽

Hemispheric Differences ◽

Affective Valence ◽

Emotional Words ◽

Emotion Words ◽

The Right

This research examined differences in the perception of emotion words as a function of individual differences in subclinical levels of depression and anxiety. Participants completed measures of depression and anxiety and performed a lexical decision task for words varying in affective valence (but equated for arousal) that were presented briefly to the right or left visual field. Participants with a lower level of depression demonstrated hemispheric asymmetry with a bias toward words presented to the left hemisphere, but participants with a higher level of depression displayed no hemispheric differences. Participants with a lower level of depression also demonstrated a bias toward positive words, a pattern that did not occur for participants with a higher level of depression. A similar pattern occurred for anxiety. Overall, this study demonstrates how variability in levels of depression and anxiety can influence the perception of emotion words, with patterns that are consistent with past research.

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The Two Components of Social Desirability and their Relations to Resting Frontal Brain Asymmetry

Journal of Individual Differences ◽

10.1027/1614-0001.26.1.29 ◽

2005 ◽

Vol 26 (1) ◽

pp. 29-42 ◽

Cited By ~ 23

Author(s):

Cornelia A. Pauls ◽

Jan Wacker ◽

Nicolas W. Crost

Keyword(s):

Impression Management ◽

Big Five ◽

Hemispheric Asymmetry ◽

Incentive Motivation ◽

Blink Rate ◽

Frontal Brain ◽

Self Reports ◽

Opposite Sex ◽

The Relationship ◽

Α Band

Abstract. The aim of the present study was to investigate the relationships between resting frontal hemispheric asymmetry (FHA) in the low α band (8-10.25 Hz) and the two components of socially desirable responding, i.e., self-deceptive enhancement (SDE) and impression management (IM), in an opposite-sex encounter. In addition, Big Five facets, self-reports of emotion, and spontaneous eye blink rate (BR), a noninvasive indicator of functional dopamine activity, were assessed. SDE as well as IM were related to relatively greater right-than-left activity in the low α band (i.e., relative left frontal activation; LFA) and to self-reported positive affect (PA), but only SDE was related to BR. We hypothesized that two independent types of motivational approach tendencies underlie individual differences in FHA and PA: affiliative motivation represented by IM and agentic incentive motivation represented by SDE. Whereas the relationship between SDE and PA was mediated by BR, the relationship between SDE and FHA was not.

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What Is Left Is Right

European Psychologist ◽

10.1027/1016-9040.14.1.78 ◽

2009 ◽

Vol 14 (1) ◽

pp. 78-89 ◽

Cited By ~ 8

Author(s):

Kenneth Hugdahl ◽

René Westerhausen

Keyword(s):

Speech Processing ◽

Information Transfer ◽

Hemispheric Asymmetry ◽

Functional Neuroimaging ◽

Gray Matter Volume ◽

Functional Anatomy ◽

Posterior Part ◽

Functional Asymmetry ◽

Planum Temporale ◽

Evolution Of Speech

The present paper is based on a talk on hemispheric asymmetry given by Kenneth Hugdahl at the Xth European Congress of Psychology, Praha July 2007. Here, we propose that hemispheric asymmetry evolved because of a left hemisphere speech processing specialization. The evolution of speech and the need for air-based communication necessitated division of labor between the hemispheres in order to avoid having duplicate copies in both hemispheres that would increase processing redundancy. It is argued that the neuronal basis of this labor division is the structural asymmetry observed in the peri-Sylvian region in the posterior part of the temporal lobe, with a left larger than right planum temporale area. This is the only example where a structural, or anatomical, asymmetry matches a corresponding functional asymmetry. The increase in gray matter volume in the left planum temporale area corresponds to a functional asymmetry of speech processing, as indexed from both behavioral, dichotic listening, and functional neuroimaging studies. The functional anatomy of the corpus callosum also supports such a view, with regional specificity of information transfer between the hemispheres.

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