The anatomy of emotion

Area of Science:

• Neuroscience
• Autonomic Nervous System Research
• Emotional Processing

Background:

• Emotion is understood as a function of the autonomic nervous system extending throughout the body and brain.
• The hypothalamus is proposed as a central emotional or mood organ, connected to a reticular core in the brainstem.

Purpose of the Study:

• To explore the neural basis of emotion and mood.
• To investigate the role of the hypothalamus and reticular formation in emotional processing.
• To differentiate the functions of the limbic system and cerebral cortex in emotion and memory.

Main Methods:

• Review of evidence from brain self-stimulation reward studies.
• Analysis of the central pain syndrome.
• Examination of posture and movement changes associated with mood.
• Consideration of findings from epileptic convulsions.
• Evaluation of results from pre-frontal leucotomy procedures.

Main Results:

• The hypothalamus appears to initiate and coordinate vital impulses.
• The reticular formation, potentially the centrencephalic integrating system, contains adrenergic and cholinergic fibers, suggesting a role in the autonomic nervous system.
• Evidence supports the involvement of these structures in various neurological and psychiatric phenomena.
• The limbic system is implicated in ongoing memory, not mood.
• Mood appears to manifest in the lateral temporal convexity, often separate from peripheral emotional awareness.

Conclusions:

• The hypothalamus and associated brainstem reticular formation are central to emotional processing and autonomic regulation.
• Specific brain regions, including the lateral temporal convexity, are critical for the conscious experience of mood.
• The limbic system's primary role may be in memory, distinct from emotional experience.