A Focus on the Functions of Area 25

Area of Science:

• Neuroscience
• Affective Disorders Research
• Comparative Neurobiology

Background:

• Subcallosal area 25, part of the anterior cingulate cortex, is understudied.
• Its connectivity suggests a role in linking bioregulatory and emotional states, crucial for understanding depression.
• Cross-species functional comparison is limited by uncertainty regarding rodent homologues.

Purpose of the Study:

• To review evidence for subcallosal area 25's role in mood and affective disorders.
• To compare findings from human studies with manipulations in monkeys and rodents.
• To clarify the functional homologue of area 25 in rodents for translational research.

Main Methods:

• Review of physiological and behavioral data from human studies (non-pathological and pathological).
• Analysis of studies involving causal manipulations of area 25 in monkeys.
• Examination of studies manipulating the putative rodent homologue, infralimbic cortex (IL).

Main Results:

• Similarities observed between monkey area 25 and rodent IL in regulating reward-driven behaviors.
• Inconsistencies noted in threat response regulation across species and within rodent literature.
• Evidence supports a causal role for area 25 in negative affect, positive affect, and associated physiological changes.

Conclusions:

• Subcallosal area 25 is causally implicated in the affective and physiological disturbances characteristic of mood disorders.
• Further research, particularly in non-human primates, is vital for clinical translation.
• Understanding area 25's function can inform therapeutic strategies for depression and related conditions.