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Avoidance-avoidance conflict refers to a psychological situation where a person must choose between two or more unpleasant alternatives. These conflicts are particularly stressful because neither option is desirable. This dilemma is often expressed in sayings like "caught between a rock and a hard place" or "between the devil and the deep blue sea." For instance, individuals who fear dental procedures may find themselves torn between enduring a painful toothache or facing the...
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Ventral Hippocampal CA1 and CA3 Differentially Mediate Learned Approach-Avoidance Conflict Processing.

Anett Schumacher1, Franz R Villaruel1, Alicia Ussling1

  • 1Department of Psychology (Scarborough), University of Toronto, ON M1C 1A4, Canada.

Current Biology : CB
|April 3, 2018
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Summary

The ventral hippocampus, specifically subregions CA1 and CA3, plays opposing roles in resolving approach-avoidance conflicts. Inactivation of ventral CA1 promotes avoidance, while ventral CA3 inactivation promotes approach to conflict cues.

Keywords:
anxietybehavioral inhibitiondecision makinghippocamusmedial temporal lobemotivationnovelty detectionpunishmentrewardsubfield

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Neurobiology of Motivation and Conflict

Background:

  • Approach-avoidance conflict, crucial for survival, is implicated in mental disorders like anxiety and addiction.
  • The ventral hippocampus is recognized for its role in processing approach-avoidance conflict, potentially by modulating negative valence influence.
  • Specific subregional contributions within the hippocampus remain largely unknown despite its functional heterogeneity.

Purpose of the Study:

  • To investigate the distinct roles of ventral hippocampal subregions (CA1 and CA3) in processing approach-avoidance conflict.
  • To elucidate the neural circuitry underlying behavioral responses to stimuli with simultaneous positive and negative learned outcomes.

Main Methods:

  • Utilized a non-spatial cue-based paradigm in rats to study approach-avoidance conflict.
  • Employed transient pharmacological inactivation of specific ventral hippocampal subregions (vCA1, vCA3) and dorsal counterparts (dCA1, dCA3).
  • Conducted additional behavioral tasks to rule out confounding factors like altered novelty detection or locomotor activity.

Main Results:

  • Inactivation of ventral CA1 led to avoidance of conflict cues associated with both positive and negative outcomes.
  • Inactivation of ventral CA3 resulted in a preference for the conflict cue, indicating a shift towards approach behavior.
  • Inactivation of dorsal CA1 and CA3 did not alter conflict behavior, highlighting the specific role of ventral subregions.

Conclusions:

  • Ventral CA1 and CA3 subregions of the hippocampus exert distinct and opposing influences on approach-avoidance conflict processing.
  • These findings provide critical insights into the functional specialization within the ventral hippocampus and its circuitry.
  • Understanding these mechanisms may offer new perspectives for treating disorders characterized by impaired conflict resolution.