The Entrapment Scale

Abstract

The Entrapment Scale (ES) is a widely recognized psychological scale developed by Paul Gilbert and Sarah Allan in 1998. Its primary function is to quantify the subjective degree to which an individual feels psychologically trapped, either by unavoidable life circumstances (external entrapment) or by internal cognitive and emotional states (internal entrapment). The development of the ES is rooted in the evolutionary theory of depression, which posits that the inability to execute “arrested flight”—the perception of being unable to escape aversive or threatening situations—is a critical proximal predictor of severe psychopathology, including depressive symptoms and suicidal ideation.

The scale’s distinction between internal and external factors provides a valuable tool for researchers studying the relationship between social defeat, perceived low social rank, and the onset or maintenance of affective disorders, offering a nuanced assessment framework applicable across diverse clinical and non-clinical populations.

Keywords

Psychological Entrapment, Defeat, Arrested Flight, Depression, Evolutionary Theory, Internal Entrapment, External Entrapment, Psychopathology, Suicidality, Self-criticism, Affective Disorder.

Authors

Paul Gilbert, Sarah Allan.

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Purpose

The central purpose of the Entrapment Scale is to provide a reliable, standardized, and quantifiable measure of the subjective experience of feeling constrained or immobilized in undesirable life situations or distressing psychological states. This measurement is essential for empirical research aiming to establish the causal pathways between social threats (such as social defeat or perceived low social status) and severe mental health outcomes, particularly chronic or recurrent depression.

The scale’s utility lies in its capacity to test hypotheses derived from evolutionary psychology. According to this framework, depressive states may function as evolved, involuntary responses to perceived inescapable threats or losses, often related to social competition or the loss of key relationships. By isolating internal and external facets of entrapment, the ES facilitates a more precise understanding of which factors contribute most significantly to clinical distress in different individuals.

Construct

The core psychological construct measured by the ES is psychological entrapment, defined as the powerful perception of being unable to escape, withdraw, or otherwise disengage from a situation deemed distressing, threatening, or profoundly undesirable. This construct is recognized as a key proximal factor in the etiology and persistence of severe mental health challenges, notably chronic depressive disorders and high-risk suicidal behavior.

The scale operationalizes this construct through a robust two-factor model, reflecting distinct sources of perceived constraint:

• External Entrapment: This factor (comprising Items 1–10) focuses on feelings of being trapped by environmental forces. This includes social circumstances, complex relationships, overwhelming obligations, or the influence of more powerful external agents. It represents perceived environmental constraints on personal freedom and action.
• Internal Entrapment: This factor (comprising Items 11–16) assesses feelings of being trapped within the self. This dimension captures a sense of imprisonment within one’s own identity, thoughts, emotional patterns, or the perceived inability to enact personal change. It often reflects profound self-loathing or internalized self-criticism.

Validity

The Entrapment Scale has demonstrated strong empirical support for its validity across numerous studies. It exhibits robust concurrent validity, showing significant correlations between higher entrapment scores (both internal and external) and increased severity of related psychological symptoms, including depressive symptoms, generalized anxiety, and feelings of hopelessness. Furthermore, the scale demonstrates strong predictive validity, with entrapment scores consistently forecasting future symptom severity.

Crucially, internal entrapment often shows a particularly powerful and unique association with suicidal ideation and overall clinical severity. This suggests that the internal subscale captures a deep, self-related distress that is highly relevant to risk assessment. The ES also exhibits discriminant validity, proving that its predictive power regarding psychopathology is distinct and unique beyond that provided by more general measures of stress or negative affect, thereby confirming its specific theoretical role within the evolutionary model of psychopathology alongside constructs like social defeat and submissive behavior.

Reliability

The Entrapment Scale is characterized by strong internal consistency, confirming that its items reliably measure the same underlying concept. Across diverse validation studies, the Cronbach’s alpha coefficients for the overall 16-item scale consistently range from 0.85 to 0.95, indicating excellent reliability. The two distinct subscales, Internal Entrapment and External Entrapment, also typically report similarly high coefficients, ensuring the consistent measurement of both the environmental and self-related dimensions of the construct.

Factor Analysis

The foundational factor structure of the scale was established through initial factor analysis conducted by Gilbert and Allan in their seminal 1998 paper. This analysis rigorously confirmed the intended two-factor model underlying the 16 items. This structure, comprising the External and Internal Entrapment subscales, has been consistently replicated across various global clinical and non-clinical samples, providing strong empirical support for the scale’s theoretical basis. This structural integrity is vital, as the distinction between being constrained by the environment versus being constrained by the self is fundamental to the scale’s utility in research focused on affect regulation, threat response systems, and psychotherapeutic intervention targeting.

Instrument

Test Type: Self-report Psychometrics Scale

Format: 16 items rated on a 5-point Likert scale.

Language Available: English (Original), with validated translations available in numerous languages for cross-cultural research, including German, Spanish, and Turkish.

Population Group: Clinical and Non-clinical adults and adolescents.

Age Group: Typically utilized with individuals aged 18 years and older, though adapted versions may be employed for younger populations under specific research protocols.

Population Details: The scale is used extensively in academic and clinical settings, particularly in studies involving patients diagnosed with Major Depressive Disorder, generalized anxiety disorders, chronic stress conditions, and those presenting with suicidal ideation.

Test Methodology: Respondents are asked to indicate the degree to which each attitude statement accurately represents their current or general view of themselves. The scoring utilizes the following descriptive anchors:

0 = Not at all like me

1 = A little bit like me

2 = Moderately like me

3 = Quite a bit like me

4 = Extremely like me

Keywords

Psychological Entrapment, Social Defeat, Arrested Flight, Chronic Stress, Affective Disorder, Social Rank Theory, Gilbert, Self-Trapped.

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Authors

Author ORCID Identifier: Information not available in source content.

Affiliation Email addresses: Information not available in source content. (The authors were historically affiliated with the University of Derby: www.derby.ac.uk)

Correspondence Address: Information not available in source content.

Permissions & Fee and Test Year

The Entrapment Scale was first published in 1998 by Gilbert and Allan. For academic and standard clinical research purposes, the scale is generally made available by the authors, often without an associated fee. However, researchers intending to use the scale for commercial applications, or those planning to modify or adapt the instrument, must formally seek permission from Professor Paul Gilbert or the relevant original publisher.

Reference’s

The core theoretical underpinnings and psychometric validation of the scale are detailed in the following academic publications:

• Gilbert‚ P. & Allan‚ S. (1998). The role of defeat and entrapment (arrested flight) in depression: an exploration of an evolutionary view. Psychological Medicine‚ 28‚ 584-97. (This article contains the original scale and initial validation data.)
• Gilbert‚ P.‚ Allan‚ S.‚ Brough‚ S.‚ Melley‚ S. & Miles‚ J. (2002). Anhedonia and positive affect: relationship to social rank‚ defeat and entrapment. Journal of Affective Disorders‚ 71‚ 141-151.
• Gilbert‚ P. (2001a). Evolutionary approaches to psychopathology: The role of natural defences. Australian and New Zealand Journal of Psychiatry‚ 35‚ 17-27.
• Gilbert‚ P. (2001b). Depression and stress: A biopsychosocial exploration of evolved functions and mechanisms. Stress: The International Journal of the Biology of Stress‚ 4‚ 121-135.
• Gilbert. P. (2007). Psychotherapy and Counselling for depression. London: Sage.

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Items of the The Entrapment Scale

The Entrapment Scale is comprised of 16 items, which are rated using a 5-point ordinal scale (ranging from 0 to 4).

Scoring Note: Items 1-10 are summed to form the External Entrapment subscale score. Items 11-16 are summed to form the Internal Entrapment subscale score.

SCALE ANCHORS

0 = Not at all like me     1 = A little bit like me     2 = Moderately like me    3 = Quite a bit like me      4 = Extremely like me

1. I am in situation I feel trapped in 0 1 2 3 4
2. I have a strong desire to escape from things in my life 0 1 2 3 4
3. I am in a relationship I can’t get out of 0 1 2 3 4
4. I often have the feeling that I would just like to run away 0 1 2 3 4
5. I feel powerless to change things 0 1 2 3 4
6. I feel trapped by my obligations 0 1 2 3 4
7. I can see no way out of my current situation 0 1 2 3 4
8. I would like to get away from other more powerful people in my life 0 1 2 3 4
9. I have a strong desire to get away and stay away from where I am now 0 1 2 3 4
10. I feel trapped by other people 0 1 2 3 4
11. I want to get away from myself 0 1 2 3 4
12. I feel powerless to change myself 0 1 2 3 4
13. I would like to escape from my thoughts and feeling 0 1 2 3 4
14. I feel trapped inside myself 0 1 2 3 4
15. I would like to get away from who I am and start again 0 1 2 3 4
16. I feel I’m in a deep hole I can’t get out of 0 1 2 3 4