We do not know for sure at this point. But some reasonable assumptions can be made. The right hemisphere of the brain processes sensory input relating to emotions. From there the information is sent to the brain's left hemisphere, which controls language and gives our emotions names. The cerebellum, corpus callosum and amygdala, meanwhile, are in charge of transferring this sensory data between the right and left hemispheres. So it's possible that an emotional intelligence level on the low side could involve a malfunction of some sort in one of these areas.
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