Research from our lab
At our lab in Maribor, the first research trying to relate
performance on the MSCEIT (at that time still an experimental version) with
brain activity determined with the electroencephalogram (EEG) was conducted (Jaušovec
et al., 2001). The results showed that high emotional intelligent individuals
displayed less desynchronization in the upper alpha band, as well as more left
hemispheric theta desynchronization. A finding that is similar to the one observed
for the verbal and performance components of general intelligence supporting
the neural efficiency hypothesis.
A follow up study confirmed these findings (Jaušovec &
Jaušovec 2005a). The analysis of EEG in
relation to the level of emotional intelligence revealed a clear cut difference
in brain oscillations between the induced upper alpha and gamma band. This
difference was only present for the emotional intelligence task of identifying
emotions in pictures. The pattern of event related synchronization/ desynchronization
(ERD/ERS) in the induced upper alpha band was in line with the neural
efficiency theory—high EI performers (HEIQ) displayed a time-related decrease
in ERD, whereas average performers (AEIQ) displayed increased ERD (see Figure
1). On the other hand, the pattern of ERD/ERS in the induced gamma band was
contrary to what would be predicted by the neural efficiency theory—the HEIQ group
displayed induced gamma band ERS, while the AEIQ group displayed induced gamma
band ERD. The difference increased from stimulus onset till 4000 ms. A possible
explanation could be that the HEIQ individuals solved the EI task by relying
more on figural and less on semantic information provided by the displayed
pictures. This would explain the increased ERS in the induced gamma band and the
decreased ERD in the induced upper alpha band shown by the HEIQ group. A
reverse strategy–more semantic and less figural orientation–could be hypothesized
for the AEIQ group of individuals.
Figure 1 Mean percentages
of ERD/ERS of induced upper alpha band activity of AEIQ and HEIQ individuals
while identifying emotions in pictures (IDEM).
The focus in our next studies was on sex differences in EI
and their relation to brain activity. In the first one (Jaušovec & Jaušovec
2005b), we investigated gender differences in resting EEG (in three individually
determined narrow alpha frequency bands) related to the level of general and
emotional intelligence. The main finding of the study was that males and females
differed in resting brain activity related to their level of general
intelligence. Brain activity in males decreased with the level of intelligence,
whereas an opposite pattern of brain activity was observed in females. A
finding already discussed in our previous blogs on sex differences. The differences between males
and females in resting EEG related to emotional intelligence were much less pronounced
than for general intelligence. In males, the correlations between
log-transformed alpha power and experiential EI had a reverse pattern than the correlations with IQ, whereas strategic EI correlated negatively with
log-transformed alpha power similarly as fluid intelligence did.
The same pattern of correlations between coherence in the
parieto-occipital areas and the Experiential EI area score could be also
observed in the lower-1 alpha band (see Figure 2). For females significant
correlations between Strategic EI and decoupling in frontal brain areas and
between Experiential EI and parieto-occipital coupling of brain areas were
obtained. The reverse tendency in correlations for the area scores Experiential
and Strategic EI is expected, because experiential EI refers to more intuitive
components of EI, whereas strategic EI involves more ‘‘logic’’, indicating the
respondents' ability to understand and manage emotions.
Figure 2 The bar charts
represent correlation coefficients (y-axes) between Z-coherence measures
(collapsed with respect to distances and location into frontal,
parieto-occipital, and long distance) in three alpha sub-bands and general and
emotional intelligence. * = p < .05,
** = p < .01.
In yet another study, gender and
ability (performance and emotional intelligence)-related differences in brain
activity, assessed with EEG methodology, were investigated while respondents solved spatial rotation tasks and a task in which they identified emotions in faces (IDEM) (Jaušovec & Jaušovec, 2008). The most robust gender-related difference in
brain activity was observed in the lower-2 alpha band. As expected, males and
females displayed an inverse IQ-activation relationship in the domain in
which they usually perform better: females in the emotional intelligence domain,
and males in the visuospatial ability domain. This difference was also present
when the relationships between gender and the levels of PIQ and EIQ were
investigated. Because activity in the
lower-2 alpha band is related to attentional processes it can be assumed that
especially females increased their level of attention when solving the rotation
task. Males on the other hand solved both problems with a similar level of
activity, which was higher than that of females while solving the IDEM task. A
similar pattern of brain activity was also observed for the male/female respondents
with different levels of PIQ and EIQ. The observed brain activity in the lower
and upper alpha bands suggests that high PIQ females solved the problems with an
overall increased level of activity. High EI males solved the problems also
with increased brain activity—mainly in the frontal brain areas. One could
speculate that high ability representatives of both genders to some extent
compensate for their inferior problem solving skills (males in emotional tasks
and females in spatial rotation tasks) by increasing their level of attention.
The more frontal brain activity in men could point to an intense attentional
control of working memory, whereas the more diffuse activity in females (HPIQ)
could point to a general increased level of attention.
Other research
In an event related (ERP) study by Raz et al. (2013), the
neural efficiency hypothesis put forward in our research was further
elucidated. It was shown that participants with high EI exhibited
significantly greater amplitudes of the
early P2 and later P3 ERP components in response to emotional pictures, which
was evident at posterior-parietal as well as at frontal scalp locations. The
results suggest that visual emotional stimuli elicit greater mobilization of
attention resources and subsequently more elaborative emotional information
processing in individuals with high EI compared with those with low EI.
The studies employing different MRI techniques were mainly
interested in the topography of brain areas involved in components of EI. Timoshanko
et al. (2014) using methodology for neurometabolite quantification reported a
positive correlation between EI and Choline (Cho) levels in the left dorsolateral prefrontal
cortex (DLPFC) and the left amygdala. Concentrations between Cho levels in the
left DLPFC showed positive correlations with MSCEIT Managing Emotions together
with a significant association between left amygdala Cho concentration and
MSCEIT Understanding Emotions. Similar findings employing MRI methodology were
reported by Killgore et al. (2013). The authors found that the strategic
emotional intelligence subscale correlated positively with gray matter volume
in the left ventromedial prefrontal and insular cortex. Moreover, the study by Krueger et al. (2009) revealed that key competencies underlying EI depend on distinct neural substrates in the prefrontal cortex (PFC). First, ventromedial PFC damage diminishes strategic EI, hindering the understanding and managing of emotional information. Second, dorsolateral PFC damage diminishes experiential EI, decreasing the efficient perception and integration of emotional information.
In yet another study employing diffusion tensor imaging, Pisner et al. (2016) demonstrated that white matter integrity was positively
correlated with the strategic area branches of the MSCEIT (understanding
emotions and managing emotions), but not the experiential branches (perceiving and
facilitating emotions). Specifically, the Understanding emotions branch was
associated with greater fractional anisotropy (FA) within somatosensory and
sensory-motor fiber bundles, particularly those of the left superior
longitudinal fasciculus and corticospinal tract.
The results obtained in our lab as well as other studies
employing methodology based on cardiovascular principles demonstrated that
brain activity observed in relation to EI performance is similar to the one
observed in relation to fluid intelligence (e.g. neural efficiency, white
matter integrity), although to some extent different - greater
activity is often observed in the amygdala, which is assumed to be associated with
emotional processing.
References
Jaušovec,
N., Jaušovec, K. & Gerlič, I.
(2001). Differences in event related and induced EEG patterns in the theta and
alpha frequency bands related to human emotional intelligence. Neuroscience
Letters, 311, 93-96.
Jaušovec, N.
& Jaušovec, K. (2005a). Differences in induced gamma and upper alpha
oscillations in the human brain related to verbal/performance and emotional
intelligence. International Journal of Psychophysiology.
Jaušovec, N.,
& Jaušovec, K, (2005b). Sex differences in brain activity related to
general and emotional intelligence. Brain and
Cognition 59, 277-286.
Jaušovec, N.,
& Jaušovec, K. (2008). Spatial-rotation and recognizing emotions: Gender
related differences in brain activity, Intelligence, 36, 383-393.
Killgore, W. D.
S., Weber, M., Schwab, Z. J., DelDonno, S. R., Kipman, M., Weiner, M. R., &
Rauch, S. L. (2012). Gray matter correlates of Trait and Ability models of
emotional intelligence: NeuroReport, 23(9), 551–555.
https://doi.org/10.1097/WNR.0b013e32835446f7
Krueger, F.,
Barbey, A. K., McCabe, K., Strenziok, M., Zamboni, G., Solomon, J., … Grafman,
J. (2009). The neural bases of key competencies of emotional intelligence.
Proceedings of the National Academy of Sciences, 106(52), 22486–22491.
https://doi.org/10.1073/pnas.0912568106
Pisner, D. A.,
Smith, R., Alkozei, A., Klimova, A., & Killgore, W. D. S. (2016). Highways
of the emotional intellect: white matter microstructural correlates of an
ability-based measure of emotional intelligence. Social Neuroscience, 1–15.
https://doi.org/10.1080/17470919.2016.1176600
Raz, S., Dan, O.,
Arad, H., & Zysberg, L. (2013). Behavioral and neural correlates of
emotional intelligence: An Event-Related Potentials (ERP) study. Brain
Research, 1526, 44–53. https://doi.org/10.1016/j.brainres.2013.05.048
Timoshanko, A.,
Desmond, P., Camfield, D. A., Downey, L. A., & Stough, C. (2014). A
magnetic resonance spectroscopy (1H MRS) investigation into brain metabolite
correlates of ability emotional intelligence. Personality and Individual
Differences, 65, 69–74. https://doi.org/10.1016/j.paid.2014.01.022
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