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Damage or abnormalities in the frontal lobe -- a brain area that regulates movement, inhibition, emotions and general behaviors -- has been linked to violent behavior.
CNN: Insights on why people 'snap' and kill
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The frontal lobe areas are associated with reasoning, planning, generating language, movement, and problem solving, which means that the mediums were experiencing reduced focus, lessened self-awareness and fuzzy consciousness during psychography.
FORBES: When You Inject Spirit Mediums' Brains with Radioactive Chemicals, Strange Things Happen
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The frontal lobe of the brain is concerned with reasoning, planning, parts of speech and movement, emotions, and problem-solving.
BBC: Differences found in autistic brains