Can any one suggest a good article about features of EEG of left-handed people?
I was surprised when find that there are only few old articles about it. I find only one new article by Propper, Ruth E., et al. (2012). Maybe I miss something.
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2$\begingroup$ I haven't read that, but they're likely going to just be correlations that may have little to do with the actual "handedness" difference. Look into hearing, as a small percentage of left-handed people have their dominant cortices for speech and language shifted to the other side. This is not a reliable indicator, though, as even most left handed people have the same placement of Broca's area, etc. $\endgroup$– Chuck SherringtonCommented Mar 18, 2013 at 23:01
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$\begingroup$ It does not matter. I don't interesting in language or motor areas specifically. Not-right handedness is an indicator of not normal (alternative) development of the brain. It must have correlates in EEG. $\endgroup$– sviterCommented Mar 19, 2013 at 7:38
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3$\begingroup$ "It must have correlates in EEG" -- No. It must have some neural correlate. EEG can capture only a small percentage of behavioral phenomena due to its relatively course spatial frequency and inability to record activity in more medial brain regions. I'd broaden your search accordingly; perhaps that will lead to more relevant literature. $\endgroup$– zergylordCommented Mar 20, 2013 at 23:00
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2 Answers
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Abstract
Background
According to decades of research on affective motivation in the human brain, approach motivational states are supported primarily by the left hemisphere and avoidance states by the right hemisphere. The underlying cause of this specialization, however, has remained unknown. Here we conducted a first test of the Sword and Shield Hypothesis (SSH), according to which the hemispheric laterality of affective motivation depends on the laterality of motor control for the dominant hand (i.e., the “sword hand," used preferentially to perform approach actions) and the nondominant hand (i.e., the “shield hand," used preferentially to perform avoidance actions).
Methodology/Principal Findings
To determine whether the laterality of approach motivation varies with handedness, we measured alpha-band power (an inverse index of neural activity) in right- and left-handers during resting-state electroencephalography and analyzed hemispheric alpha-power asymmetries as a function of the participants' trait approach motivational tendencies. Stronger approach motivation was associated with more left-hemisphere activity in right-handers, but with more right-hemisphere activity in left-handers.
Conclusions
The hemispheric correlates of approach motivation reversed between right- and left-handers, consistent with the way they typically use their dominant and nondominant hands to perform approach and avoidance actions. In both right- and left-handers, approach motivation was lateralized to the same hemisphere that controls the dominant hand. This covariation between neural systems for action and emotion provides initial support for the SSH.
Citation: Brookshire G, Casasanto D (2012) Motivation and Motor Control: Hemispheric Specialization for Approach Motivation Reverses with Handedness. PLoS ONE 7(4): e36036. doi:10.1371/journal.pone.0036036
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Propper RE, et al. 2012. Asymmetry in Resting Alpha Activity: Effects of Handedness
The authors found differences in resting state alpha power depending on degree of handedness.
ABSTRACT
Study Aim: Frontal electroencephalographic (EEG) alpha band power during rest shows increased right, and/or decreased left, hemisphere activity under conditions of state or trait withdrawal-associated affect. Non-right-handers (NRH) are more likely to have mental illnesses and dispositions that involve such withdrawal-related affect. The aim of the study was to examine whether NRH might be characterized by increased right, relative to left, hemisphere activity during rest.
Methods: The present research investigated that hypothesis by examining resting EEG alpha power in consistently-right-handed (CRH) and NRH individuals.
Results: In support of the hypothesis, NRH demonstrated decreased right hemisphere alpha power, and therefore increased right hemisphere activity, during rest, compared to CRH.
Conclusions: The study demonstrates further support for an association between increased right hemisphere activity and negative affect via an association between such EEG activity and NRH.
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$\begingroup$ Link-only answers are frowned upon. Would you mind elaborating on the contents of your link? $\endgroup$ Commented Jan 8, 2016 at 23:51