Stress induced analgesia plays an adaptive role in the organization of behavioral responding.
Level 5 - mechanism / opinion, no new human data
Narrative review and preclinical behavioral/mechanism synthesis
PubMed 3066445 · doi:10.1016/0361-9230(88)90033-0
What was done
The authors conducted a narrative review of literature and experimental paradigms evaluating stress-induced analgesia (SIA), its underlying opioid and non-opioid mechanisms, and its conditioning properties. They also summarized a series of experiments from their own laboratory examining how SIA induction modulates behavioral performance and learning under varying levels of threat.
What was found
The abstract reports no quantitative values or statistical metrics. Qualitatively, it reports that stimuli inducing SIA do not necessarily need to be overtly aversive or stressful. SIA involves semi-independent opioid and non-opioid mechanisms that are subject to differential conditioning. Additionally, SIA interacts with behavioral performance along an inverted U-shaped curve, where low stress levels facilitate responding and learning, while high stress levels disrupt them.
Why it matters
The review provides a theoretical framework framing pain suppression during stress as an organized, adaptive behavioral mechanism that optimizes an organism's survival during threatening encounters, rather than an incidental consequence of trauma.
Limits
The abstract provides no quantitative data, effect estimates, sample sizes, or description of a systematic literature search. Findings are based on preclinical animal models and narrative synthesis, limiting direct translation to clinical human pain processing.
Cited by
- supports During an active physical fight, individuals feel less pain because the brain prioritizes survival over pain processing.