Are all pain tolerance tasks the same? Convergent validity of four behavioral pain tolerance tasks, self-reported capability for suicide, and lifetime self-injurious behaviors

The effect of experimental emotion induction on experimental pain: a systematic review and meta-analysis

ABSTRACT

The idea that emotions can influence pain is generally recognized. However, a synthesis of the numerous individual experimental studies on this subject is lacking. The aim of the present systematic review and meta-analysis was to synthesize the existing evidence on the effect of experimental emotion induction on experimental pain in nonclinical adults. PsycInfo and PubMed were searched up until April 10, 2023, for studies assessing differences in self-reported pain between emotion induction groups and/or control groups or between conditions within group. Risk of bias was assessed for the individual studies. The literature search yielded 78 relevant records of 71 independent studies. When compared with control conditions, the pooled results revealed a statistically significant pain-attenuating effect of positive emotion induction (between-group: Hedges g = -0.48, 95% CI: -0.72; -0.25, K = 9; within-group: g = -0.24, 95% CI: -0.32; -0.15, K = 40), and a statistically significant pain-exacerbating effect of negative emotion induction in within-group analyses but not between-group analyses (between-group: g = -0.29, 95% CI: -0.66; 0.07, K = 10; within-group: g = 0.14, 95% CI: 0.06; 0.23, K = 39). Bayesian meta-analysis provided strong support for an effect of positive emotion induction but weak support for an effect of negative emotion induction. Taken together, the findings indicate a pain-attenuating effect of positive emotion induction, while the findings for negative emotion induction are less clear. The findings are discussed with reference to theoretical work emphasizing the role of motivational systems and distraction for pain. Limitations include considerable heterogeneity across studies limiting the generalizability of the findings.

Pain tolerance and threshold in suicide attempters: A systematic review and meta-analysis

It has been hypothesized that individuals less sensitive to pain could be at higher risk of suicide. However, data on pain sensitivity in suicide attempters (SA) obtained using experimental procedures are heterogeneous. The aim of this systematic review and meta-analysis was to investigate and compare pain tolerance and threshold in SA (patients with lifetime history of suicide attempt), non-attempters (psychiatric controls, PC), and healthy controls (HC). A random effects meta-analysis was used to estimate the standardized mean differences using data from 16 studies that compared physical pain tolerance and threshold in SA and PC or HC. Pain tolerance and threshold were not significantly different in SA and PC. However, pain tolerance, but not threshold, was higher in SA than HC. Our findings do not support the hypothesis of an altered pain perception related as a trait for suicidal vulnerability, but rather suggest altered pain perception related to psychiatric vulnerability.

Examining the relationship between dysmorphia symptoms and suicidality through the lens of the Interpersonal Theory of Suicide

OBJECTIVE

Using the Interpersonal Theory of Suicide (IPTS) as a framework, this two-study investigation tested whether burdensomeness and low belongingness explained the association between body and muscle dysmorphia symptoms and suicidal ideation (tested in Study 1 and Study 2), and if fearlessness about death and pain tolerance explained the association between dysmorphia symptoms and previous suicide attempt frequency (tested in Study 2).

METHODS

Study 1 used a community sample (n = 273) and Study 2 used an at-risk population sample (n = 261). Participants completed cross-sectional questionnaires online.

RESULTS

In Study 1, both types of dysmorphic symptoms related to suicidal ideation through burdensomeness, but only body dysmorphic symptoms related to suicidal ideation through low belongingness. In Study 2, results were replicated as both types of dysmorphic symptoms related to suicidal ideation through burdensomeness. While both types of symptoms related to low belonging, low belonging did not relate to suicidal ideation. Neither dysmorphic symptoms nor capability for suicide related to frequency of suicide attempts.

CONCLUSIONS

Results suggest that improving interpersonal needs, such as feeling more effective, may be important treatment targets for individuals with dysmorphic symptoms who also experience suicidal ideation. Future work should continue to identify mediators for suicide attempts among individuals with dysmorphia symptoms.