Inventory of Callous and Unemotional Traits (ICU)

Abstract

The Inventory of Callous Unemotional Traits (ICU), developed by Paul J. Frick in 2004, is a 24-item psychological instrument designed to quantify the presence and severity of callous-unemotional (CU) traits in children and adolescents. These traits are considered a crucial affective component of juvenile psychopathy, characterized by a profound lack of empathy, guilt, remorse, and emotional depth. The ICU is structured around three distinct subscales—Callousness, Uncaring, and Unemotional—and is available in multiple versions adaptable for self-report, parent-report, or teacher-report across youth and preschool age groups.

The scale is widely utilized in clinical and research settings to identify a specific subgroup of antisocial youth prone to severe, aggressive, and stable conduct problems. The ICU uses a 4-point Likert scale response format, where higher scores are indicative of greater levels of CU traits.

Keywords

Callous-Unemotional Traits, Psychopathy, CU, Antisocial Behavior, Aggression, Empathy Deficit, Conduct Problems, Psychological Assessment, Juvenile Delinquency.

Authors

Paul J. Frick

Purpose

The primary purpose of the ICU is the reliable and valid measurement of callous-unemotional traits in clinical and non-clinical samples of children and adolescents. By quantifying these specific affective deficits, the ICU aids researchers and clinicians in differentiating a particularly problematic subgroup of youth with antisocial behavior, who are considered to be at high risk for severe and persistent behavioral issues.

Research consistently demonstrates that high scores on the ICU are positively correlated with a range of maladaptive outcomes. These include significant school behavior problems, diminished academic achievement, engagement in bullying behavior, and elevated levels of reactive aggression. Thus, the scale serves as a valuable screening and predictive tool for assessing stability and severity in the presentation of conduct problems.

Construct

The ICU measures the psychological construct of Callous-Unemotional (CU) traits, which represent the core affective and interpersonal features of juvenile psychopathy. This construct is essentially defined by a marked deficiency in typical emotional responses, often referred to in the literature as abnormal affective empathy (Jones et al., 2010).

Specifically, CU traits encompass a pervasive pattern of behavior marked by a lack of concern for others, failure to experience guilt or remorse, limited emotional expression, and an overall deficit in empathy (Moran et al., 2009). The scale operationalizes this construct through three correlated but distinct factors: Callousness (lack of concern for others’ feelings), Uncaring (lack of concern about performance or future), and Unemotional (lack of emotional depth or expression).

Validity

Substantial evidence supports the construct validity of ICU scores, particularly among youth populations (Kimonis et al., 2014). Validation studies have consistently demonstrated that the ICU’s scores correlate appropriately with theoretically relevant external criteria, specifically measures of aggression and delinquency. This evidence confirms that the ICU accurately measures the affective features central to psychopathic tendencies.

The factorial validity has been rigorously tested through confirmatory factor analyses (CFAs) across multiple international samples and languages, confirming that the scale accurately measures the intended underlying structure of CU traits. This robust support for the factor structure across diverse samples (Essau et al., 2006; Fanti et al., 2009; Kimonis et al., 2008; Roose et al., 2010) confirms the instrument’s cross-cultural and demographic applicability, spanning differences in age and gender.

Reliability

The reliability of the ICU has been consistently supported in peer-reviewed literature, indicating that the scale provides stable and internally consistent measurements of CU traits across various contexts and populations. The psychometric properties demonstrate that the instrument is a dependable measure for use with youth (Kimonis et al., 2014).

Studies utilizing different language translations and samples—including community and clinical groups—have yielded favorable internal consistency estimates (e.g., Cronbach’s alpha), confirming the scale’s reliability in assessing the general CU factor and its three subscales. This widespread confirmation of reliability is critical for the appropriate application of ICU scores in both research settings and clinical assessment.

Factor Analysis

Extensive factor analytic research has established a consistent and reliable factor structure for the ICU across diverse populations. The consensus model supports a hierarchical structure featuring a strong general factor representing overall callous-unemotional traits, underpinned by three specific, highly correlated subfactors.

These specific subfactors are: Callousness (reflecting a lack of guilt and indifference to others, e.g., “the feelings of others are unimportant to me”); Unemotional (reflecting restricted affect and emotional expression, e.g., “I hide my feelings from others”); and Uncaring (reflecting a lack of concern about performance and future, e.g., “I try not to hurt others’ feelings,” which is a reversed-scored item). The consistency of this three-factor model has been validated through confirmatory factor analyses in numerous studies, cementing its cross-cultural stability (Essau et al., 2006; Fanti et al., 2009).

Furthermore, this factor structure has been confirmed across variations in administration (self-report, parent-report), gender, and age, including successful validation for parent reports in samples as young as ages 3 and 4 (Ezpeleta et al., 2012). This robust empirical support underscores the importance of utilizing both the total CU score and the individual subscales for comprehensive theoretical and practical exploration of psychopathic tendencies.

Instrument

Test Type: Self-report, Parent-report, or Teacher-report rating scale/questionnaire

Format: 24 statements rated using a 4-point Likert scale, ranging from 0 (Not at all true) to 3 (Definitely True)

Language Available: Multiple translations validated internationally (e.g., German, Greek, Dutch)

Population Group: Children and adolescents exhibiting externalizing behaviors or psychopathic tendencies

Age Group: Preschool (ages 3-4) through adolescence

Population Details: Utilized across community samples, clinical populations, high-risk groups (e.g., antisocial youth), and incarcerated adolescents

Test Methodology: Respondents (or informants) rate the frequency/truthfulness of 24 statements pertaining to affective and interpersonal features of CU traits. Higher total scores indicate greater severity of CU traits.

Keywords

Callousness, Uncaring, Unemotional, Juvenile Delinquency, Assessment Scale, Paul J. Frick, Affective Deficits, Psychological Inventory.

Authors

Author ORCID Identifier: Not provided in source content.

Affiliation Email addresses: [email protected] (Paul J. Frick, Department of Psychology, University of New Orleans)

Correspondence Address: Department of Psychology, University of New Orleans, New Orleans, LA, USA.

Permissions & Fee and Test Year

The Inventory of Callous-Unemotional Traits (ICU) is an unpublished rating scale originally developed by Paul J. Frick in 2004 (Frick, 2004).

The scale is generally available for free use in research settings. The official online resource for the ICU, which often provides access to the forms, is maintained by the developmental psychopathology lab at the University of New Orleans. The scale can be accessed freely online here: http://labs.uno.edu/developmental-psychopathology/ICU.html.

Reference’s

• Ciucci, E., Baroncelli, A., Franchi, M., Golmaryami, F. N., & Frick, P. J. (2014). The association between callous-unemotional traits and behavioral and academic adjustment in children: Further validation of the Inventory of Callous-Unemotional Traits. Journal of Psychopathology and Behavioral Assessment, 36(2), 189-200.
• Essau, C. A., Sasagawa, S., & Frick, P. J. (2006). Callous-unemotional traits in community sample of adolescents. Assessment, 13, 454 – 469.
• Ezpeleta, L., Tiana, J., & Frick, P. J. (2012). Factor structure of the Inventory of Callous-Unemotional Traits in Spanish preschool children. Journal of Child Psychology and Psychiatry, 53(11), 1162–1170.
• Fanti, K. A., Frick, P. J., & Georgiou, S. (2009). Linking callous unemotional traits to instrumental and non-instrumental forms of aggression. Journal of Psychopathology and Behavioral Assessment, 31, 285–298.
• Frick, P. J. (2004). The Inventory of Callous-Unemotional Traits. New Orleans, LA: UNO.
• Jones, A. P., Happé, F. G., Gilbert, F., Burnett, S., & Viding, E. (2010). Feeling, caring, knowing: different types of empathy deficit in boys with psychopathic tendencies and autism spectrum disorder. Journal of Child Psychology and Psychiatry, 51(11), 1188-1197.
• Kimonis, E. R., Fanti, K., Goldweber, A., Marsee, M. A., Frick, P. J., & Cauffman, E. (2014). Callous-unemotional traits in incarcerated adolescents. Psychological Assessment, 26(1), 227.
• Kimonis, E. R., Frick, P. J., Skeem, J., Marsee, M. A., Cruise, K., Muñoz, L. C., & Morris, A. S. (2008). Assessing callous-unemotional traits in adolescent offenders: validation of the inventory of callous-unemotional traits. Journal of the International Association of Psychiatry and Law, 31, 241–252.
• Moran, P., Rowe, R., Flach, C., Briskman, J., Ford, T., Maughan, B., Scott, S. & Goodman, R. (2009). Predictive value of callous-unemotional traits in a large community sample. Journal of the American Academy of Child & Adolescent Psychiatry, 48(11), 1079-1084.
• Roose, A., Bijttebier, P., Decoene, S., Claes, L., & Frick, P. J. (2010). Assessing the affective features of psychopathy in adolescence: A further validation of the inventory of callous and unemotional traits. Assessment, 17, 44 –57.

Items of the Inventory of Callous Unemotional Traits (ICU)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

• “I express my feelings openly”
• “I feel bad or guilt when I do something wrong”
• “I do not care if I get in trouble”
• “The feelings of others are unimportant to me”
• “I hide my feelings from others”
• “I try not to hurt others’ feelings”