Interpersonal Sexual Objectification Scale (ISOS)

Abstract

The Interpersonal Sexual Objectification Scale (ISOS) is a specialized psychometrics instrument designed to quantify the frequency of external experiences related to sexual objectification in daily life. Developed within the framework of Objectification Theory, the scale measures how often individuals perceive themselves as being treated as a collection of body parts or a sexual object, rather than as a complete person defined by competence and personality. The ISOS assesses a broad spectrum of objectifying behaviors, including verbal harassment, leering, unsolicited sexual comments, and appearance-based evaluation.

Crucially, the scale utilizes a dual temporal assessment, measuring both lifetime exposure and exposure within the past year, allowing researchers to study both the cumulative and the recent impacts of these pervasive social experiences on psychological well-being and body image. This comprehensive measurement approach provides a vital link between external environmental stressors and internal psychological outcomes, such as self-objectification and body shame.

Keywords

Interpersonal Sexual Objectification Scale, ISOS, sexual objectification, Objectification Theory, sexual harassment, body surveillance, psychological measurement, psychometrics, gender studies, self-objectification.

Authors

Angela L. Denchik, Holly B. Kozee, Tracy L. Tylka, Crystal L. Augustus-Horvath.

Purpose

The primary purpose of the ISOS is to provide a standardized, reliable, and valid self-report instrument for measuring exposure to sexually objectifying behaviors perpetrated by others. Prior to its creation, most established instruments focused on internal psychological processes, such as body monitoring or self-objectification, which are the outcomes of objectifying environments.

The ISOS addresses this critical measurement gap by quantifying the frequency of external, interpersonal experiences—ranging from catcalls and unwanted touching to explicit appearance-based evaluation. This focus on external stressors is vital for understanding how pervasive social experiences contribute to negative psychological sequelae, including body shame, anxiety, and disordered eating, particularly among high-risk groups like young women. By tracking both lifetime and recent (past year) frequency, the scale allows for the assessment of both chronic exposure and the immediate effects of current exposure.

Construct

The theoretical foundation of the ISOS rests firmly on Objectification Theory, which describes how cultural practices treat women and girls as sexual objects. This external treatment compels individuals to adopt an external, critical observer’s view of their own bodies, leading to self-objectification.

The specific construct measured is Interpersonal Sexual Objectification, defined as the external behaviors and environmental cues that signal to the individual that their value is derived primarily from their physical appearance or sexual utility, rather than their intellect, competence, or personality. The scale captures fragmentation, where attention is directed toward specific body parts (e.g., buttocks, breasts), and explicit sexual evaluation, encompassing non-verbal scrutiny (staring, leering), verbal abuse (sexist name-calling), and physical actions (unwanted contact).

Validity

The ISOS exhibits robust evidence of validity across numerous psychometric studies. Content Validity was established through a rigorous item generation process, ensuring that the items comprehensively reflect the theoretical definition of interpersonal sexual objectification experiences.

Construct Validity is strongly supported by the scale’s predictable pattern of correlations: it demonstrates significant positive associations with theoretically linked constructs such as body surveillance, body shame, appearance anxiety, and eating disorder symptoms—all known consequences posited by Objectification Theory. Furthermore, the ISOS achieves good Discriminant Validity, showing weak or non-significant correlations with conceptually distinct measures, such as general self-esteem or global negative affect, confirming that the scale is specifically measuring exposure to objectifying events, separate from generalized distress.

Reliability

The ISOS has consistently demonstrated high levels of internal Reliability, confirming that its 42 items coherently measure the single underlying construct of objectification exposure. Across diverse samples, particularly among college women, internal consistency estimates (Cronbach’s alpha) typically range from 0.90 to 0.95 for the total scale scores (both lifetime and past year sections), indicating strong homogeneity among the items.

While formal test-retest Reliability coefficients are less common in published literature, the high correlation observed between the lifetime exposure scores and the past-year exposure scores suggests a stable and enduring pattern of objectification experiences over time. These robust psychometric properties affirm the ISOS as a dependable tool for quantifying this critical psychological variable.

Factor Analysis

Initial Exploratory and Confirmatory Factor Analysis (EFA and CFA), as reported by Kozee et al. (2007), supported a robust, single-factor structure for the ISOS. This finding suggests that all 21 core items reflect a general, overarching construct of exposure to interpersonal sexual objectification.

Despite the strong evidence for a single total score, subsequent research has sometimes explored potential sub-factors to categorize the types of objectifying experiences more finely. These conceptually derived sub-factors often include: 1) Verbal Harassment and Evaluation; 2) Non-verbal Scrutiny (staring, leering); and 3) Physical Contact/Groping (unwanted touching). However, due to the high inter-correlation among these item groupings, the scale remains most frequently utilized in academic research by generating a single, comprehensive total score representing the overall frequency of objectifying events.

Instrument

Test Type: Self-report frequency measure.

Format: 42 items (21 unique objectifying events, each assessed across two time frames: lifetime and past year). Responses are scored typically using a 5-point Likert-type scale for frequency (1=Never, 5=Almost Always), though the original administration asked for raw count estimates which were subsequently mapped to frequency categories.

Language Available: Primarily English; translations may exist in subsequent cross-cultural research applications.

Population Group: Individuals who have experienced sexual objectification, utilized predominantly with female samples in the initial validation studies and subsequent research.

Age Group: Adolescents and Adults (most commonly used with college students and young adults in research settings).

Population Details: Initial validation was performed using samples composed mainly of undergraduate women.

Test Methodology: Respondents are instructed to report the frequency of specific objectifying experiences they have encountered across two time horizons. The final score is derived by summing the responses, usually calculated separately for the lifetime and past-year sections, yielding a quantitative index of exposure level.

Keywords

Body image, self-objectification, catcalling, sexual harassment, validity, reliability, psychological scale, gender psychology, psychopathology, body shame.

Authors

Author ORCID Identifier: N/A (Information not available in source content).

Affiliation Email addresses: N/A (Information not available in source content).

Correspondence Address: Correspondence generally directed to the primary authors affiliated with The Ohio State University or subsequent institutions at the time of publication (2005/2007).

Permissions & Fee and Test Year

Test Year: Initial development and publication occurred in 2005 (Denchik, Thesis) and 2007 (Kozee et al., Journal Article).

Permissions & Fee: The ISOS is generally available for non-commercial academic research purposes without a fee. Users are typically required to cite the primary published sources (Kozee et al., 2007). The original instrument and detailed development process can be found in the thesis “Development and Psychometric Evaluation of the Interpersonal Sexual Objectification Scale.” The original PDF can be downloaded here: http://kb.osu.edu/dspace/handle/1811/414

Reference’s

• Denchik, Angela L. 2005. Development and Psychometric Evaluation of the Interpersonal Sexual Objectification Scale. The Ohio State University. Department of Psychology Honors Theses.

• Kozee, H. B., Tylka, T. L., Augustus-Horvath, C. L., & Denchik, A. (2007). Development and Psychometric Evaluation of the Interpersonal Sexual Objectification Scale. Psychology of Women Quarterly, 31(2), 176–189.

Items of the Interpersonal Sexual Objectification Scale (ISOS)

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

Response Scale: 1=Never, 2= Rarely, 3=Occasionally, 4=Frequently, 5=Almost Always (Note: Respondents are asked for count estimates, which are then mapped to these frequency categories for scoring.)

How often have you been whistled at while walking down a street?

1. How many times IN YOUR ENTIRE LIFE?
2. How many times IN THE PAST YEAR?

How often have you noticed someone staring at your breasts when you are talking to them?

3. How many times IN YOUR ENTIRE LIFE?
4. How many times IN THE PAST YEAR?

How often have you felt like or known that someone was evaluating your physical appearance?

5. How many times IN YOUR ENTIRE LIFE?
6. How many times IN THE PAST YEAR?

How often have you been called a name that is sexist, like whore, bitch, etc?

7. How many times IN YOUR ENTIRE LIFE?
8. How many times IN THE PAST YEAR?

How often have you felt that someone was staring at your body?

9. How many times IN YOUR ENTIRE LIFE?
10. How many times IN THE PAST YEAR?

How often have you heard someone make negative comments about your body or a body part?

11. How many times IN YOUR ENTIRE LIFE?
12. How many times IN THE PAST YEAR?

How often have you had a romantic partner that seemed to be more interested in your body than in you as a person?

13. How many times IN YOUR ENTIRE LIFE?
14. How many times IN THE PAST YEAR?

How often have you noticed someone leering at your body?

15. How many times IN YOUR ENTIRE LIFE?
16. How many times IN THE PAST YEAR?

How often have you heard a rude, sexual remark made about your body?

17. How many times IN YOUR ENTIRE LIFE?
18. How many times IN THE PAST YEAR?

How often have you been praised (in a sexual way) for having a nice body or body part?

19. How many times IN YOUR ENTIRE LIFE?
20. How many times IN THE PAST YEAR?

How often have you been touched or fondled against your will?

21. How many times IN YOUR ENTIRE LIFE?
22. How many times IN THE PAST YEAR?

How often have you been the victim of sexual harassment (on the job, in school, etc)?

23. How many times IN YOUR ENTIRE LIFE?
24. How many times IN THE PAST YEAR?

How often have you been honked at when you were walking down the street?

25. How many times IN YOUR ENTIRE LIFE?
26. How many times IN THE PAST YEAR?

How often have you seen someone stare at one or more of your body parts?

27. How many times IN YOUR ENTIRE LIFE?
28. How many times IN THE PAST YEAR?

How often have you overheard inappropriate sexual comments made about your body?

29. How many times IN YOUR ENTIRE LIFE?
30. How many times IN THE PAST YEAR?

How often have you been encouraged to change your body shape (e.g. lose weight)?

31. How many times IN YOUR ENTIRE LIFE?
32. How many times IN THE PAST YEAR?

How often have you been criticized for not looking like another person?

33. How many times IN YOUR ENTIRE LIFE?
34. How many times IN THE PAST YEAR?

How often have you noticed that someone was not listening to what you were saying, but instead gazing at your body or a body part?

35. How many times IN YOUR ENTIRE LIFE?
36. How many times IN THE PAST YEAR?

How often have you heard someone make sexual comments or innuendos when noticing your body?

37. How many times IN YOUR ENTIRE LIFE?
38. How many times IN THE PAST YEAR?

How often has someone grabbed or pinched one of your private body areas against your will?

39. How many times IN YOUR ENTIRE LIFE?
40. How many times IN THE PAST YEAR?

How often has someone made a degrading sexual gesture towards you?

41. How many times IN YOUR ENTIRE LIFE?
42. How many times IN THE PAST YEAR?