Wrightsman Philosophy of Human Nature Scale

1. Abstract

The Wrightsman Philosophy of Human Nature Scale (PHN; Wrightsman, 1964) is a seminal psychometric instrument designed to quantify an individual’s generalized expectancies, implicit beliefs, and philosophical assumptions regarding human behavior and its underlying motivational forces. Developed in the context of personality and social psychology, the instrument addresses the foundational presuppositions that individuals maintain regarding how people typically think, feel, decide, and interact. The full-length scale comprises 84 Likert-type items evenly partitioned across six distinct, 14-item subscales: Trustworthiness (the belief that people are fundamentally honest and reliable), Altruism (the assumption of unselfishness and genuine concern for others), Independence (the view that individuals can resist social pressure and group conformity), Strength of Will and Rationality (the belief that people possess cognitive control over their outcomes and behave rationally), Complexity (the perception of human nature as intricate and difficult to comprehend), and Variability (the perception that human nature varies significantly across individuals and contexts). Respondents rate their degree of agreement with each statement using a 6-point continuum ranging from +3 (strongly agree) to -3 (strongly disagree), with no neutral midpoint. Psychometric evaluations demonstrate acceptable to strong internal consistency (split-half coefficients ranging predominantly between .60 and .78 among collegiate cohorts) and robust test-retest temporal stability across subscales (.34 to .90 across varying test-retest intervals). Structural analyses have consistently revealed two higher-order dimensions: an evaluative dimension termed General Favorability toward Human Nature (combining Trustworthiness, Altruism, Independence, and Rationality) and a cognitive-structural dimension termed Multiplexity (combining Complexity and Variability). The scale possesses extensive convergent and construct validity, demonstrating theoretically coherent associations with Machiavellianism, political cynicism, self-actualization, locus of control, and interpersonal trust.

2. Keywords

Philosophy of human nature, Wrightsman, social perception, interpersonal trust, altruism, Machiavellianism, implicit personality theory, psychometrics, social psychology, locus of control, human complexity, cynicism, test validity

3. Authors

The scale was developed by Lawrence S. Wrightsman, Jr., Ph.D. (1931–2019), an eminent American social psychologist and professor who contributed significantly to interpersonal perception, personality assessment, and psychology and law. During the conception and primary validation of the Philosophy of Human Nature Scale, Wrightsman served on the faculty at the George Peabody College for Teachers (now Peabody College of Vanderbilt University) in Nashville, Tennessee. He later joined the University of Kansas as Professor of Psychology, where he spent several decades serving as department chair and mentoring generations of researchers in social and legal psychology. His pioneering research culminated in the seminal volume Assumptions About Human Nature: A Social-Psychological Approach (Wrightsman, 1974), which elaborated upon the theoretical mechanisms, correlates, and societal implications of human nature philosophies.

4. Purpose

The primary purpose of the Wrightsman Philosophy of Human Nature Scale is to operationalize and assess the multidimensional system of beliefs that people hold about human nature in general. Every individual operates within a social world governed by implicit theories—unconscious or conscious cognitive frameworks regarding why people behave the way they do, whether others can be relied upon, whether human motivation is fundamentally noble or self-serving, and whether human behavior is governed by deterministic social forces or autonomous rational agency. In psychological science, these generalized expectancies are critical determinants of interpersonal behavior, social attribution, affective reactions, and institutional trust.

Wrightsman constructed the scale to overcome the limitations of unidimensional measures of misanthropy or trust (such as Morris Rosenberg’s 1957 Faith-in-People Scale), which treated social cynicism and optimism as singular polar opposites while neglecting cognitive structural beliefs like complexity and individual differences. The PHN scale allows investigators to decouple evaluative judgments (e.g., whether people are good, honest, or prosocial) from cognitive organizational beliefs (e.g., whether people are simple vs. complex, or static vs. malleable). This granular differentiation serves distinct theoretical and practical imperatives across multiple domains of psychology:

• Social and Personality Psychology: The scale enables empirical investigations into attribution theory, social cognition, and interpersonal dynamics. It provides a reliable metric to investigate how a person’s underlying philosophical stance shapes their susceptibility to interpersonal influence, their cooperation in social dilemmas, their propensity toward prejudice, and their leadership style.
• Clinical and Counseling Psychology: Therapeutic alliances, empathy, and psychological well-being are significantly mediated by clinicians’ and clients’ worldviews. A client who believes people are universally untrustworthy and selfish approaches relationships with defensive hostility or hypervigilance. Conversely, psychotherapists’ assumptions about whether human nature is fundamentally rational and capable of autonomous change directly affect their theoretical orientation, prognostic expectations, and therapeutic stance.
• Organizational and Industrial Psychology: The instrument has substantial utility in organizational behavior, particularly regarding managerial theory (e.g., Douglas McGregor’s Theory X and Theory Y). Leaders who hold cynical views regarding human nature tend to institute authoritarian, surveillance-heavy managerial practices, whereas leaders who perceive subordinates as trustworthy and self-directed foster autonomy and participatory governance.
• Political and Legal Psychology: Wrightsman’s later work highlighted how philosophies of human nature predict legal decision-making, juror verdicts, judicial sentencing, and institutional cynicism. Jurors who score low on Trustworthiness and Rationality are significantly more punitive and skeptical of rehabilitation, viewing offenders through deterministic and punitive lenses.

5. Psychological Construct

The Wrightsman Philosophy of Human Nature Scale conceptualizes human nature beliefs as a multidimensional cognitive architecture composed of six foundational dimensions. Each subscale represents a continuum anchored by opposing conceptual polarities, containing equal numbers of positively and negatively worded statements to eliminate acquiescence response bias. The dimensions are delineated as follows:

1. Trustworthiness (vs. Untrustworthiness)

This subscale evaluates the extent to which an individual believes that other people are fundamentally moral, honest, truthful, and dependable. High scorers conceptualize humans as inherently honorable agents who fulfill their promises, respect confidentialities, and act with integrity even when unmonitored. Low scorers maintain a cynical worldview characterized by interpersonal skepticism, assuming that people will lie, cheat, steal, or exploit others whenever they perceive an opportunity for undetected gain.

2. Altruism (vs. Selfishness)

The Altruism dimension measures assumptions concerning fundamental human motives: whether people are intrinsically prosocial, empathetic, and unselfish, or fundamentally egocentric and driven solely by self-interest. High scorers endorse the existence of genuine, uncalculating benevolence, viewing individuals as naturally inclined to assist strangers and prioritize communal welfare. Low scorers hold a Hobbesian perspective, asserting that seemingly selfless acts are merely calculated maneuvers designed to secure social status, reciprocal favors, or psychological gratification.

3. Independence (vs. Conformity)

This construct assesses beliefs regarding an individual’s autonomous agency versus susceptibility to peer pressure, societal norms, and group conformity. High scorers believe that humans have the psychological fortitude to resist groupthink, stand firm in their personal convictions, and maintain behavioral integrity despite external coercion or social disapproval. Low scorers view people as passive conformists who easily yield to collective pressures, change their opinions to align with the majority, and lack independent moral courage.

4. Strength of Will and Rationality (vs. External Determinism / Irrationality)

This subscale taps into beliefs concerning cognitive control, willpower, self-determination, and logic versus irrational impulses and fatalism. High scorers presume that people possess rational judgment, understand their own motivational states, and can exercise self-discipline to determine their own destinies. Low scorers conceptualize human action as dictated by unconscious impulses, emotional instability, irrational fears, or uncontrollable environmental circumstances, minimizing personal volition.

5. Complexity (vs. Simplicity)

Unlike the four preceding evaluative dimensions, Complexity captures a structural cognitive belief regarding whether human psychology is transparent or intricate. High scorers view people as psychologically deep, nuanced, multifaceted, and challenging to comprehend, requiring prolonged observation to genuinely understand. Low scorers subscribe to a reductionist perspective, assuming that human behavior is simple, transparent, uniform, and easily deciphered through superficial acquaintance.

6. Variability (vs. Constancy / Similarity)

The final dimension assesses perceptions of individual differences and intra-individual behavioral plasticity. High scorers view human nature as profoundly variable across individuals and dynamically responsive to diverse situational conditions. They assume that individuals differ drastically from one another in basic traits and that a single person may behave completely differently across changing contexts. Low scorers perceive human nature as largely uniform, static, and immutable, asserting that basic human characteristics remain constant across time, cultures, and situations.

Composite Indices: Favorability and Multiplexity

Beyond individual subscales, Wrightsman established two major aggregate indices:

• General Favorability toward Human Nature (PHN Total): Derived by aggregating the four substantive evaluative subscales (Trustworthiness + Altruism + Independence + Strength of Will). This composite score reflects an overall affective and moral evaluation of humanity, spanning from profound misanthropy and cynicism to supreme humanistic optimism.
• Multiplexity: Derived by summing the Complexity and Variability subscales. This index captures cognitive differentiation—the degree to which an individual views human beings as intricate, heterogeneous, and context-dependent rather than simplistic, homogeneous, and easily categorized.

6. Theoretical Framework

The theoretical architecture of the Philosophy of Human Nature Scale is anchored in the convergence of implicit personality theory, naive psychology, and social cognitive theory. Early mid-twentieth-century psychology witnessed a paradigm shift toward understanding social perception from the viewpoint of the actor. Jerome Bruner and Renato Tagiuri (1954) demonstrated that perceivers do not evaluate others through isolated, objective sensory data; rather, they project preexisting, highly structured implicit theories that link traits together into subjective cognitive maps.

Concurrently, Fritz Heider’s (1958) seminal work The Psychology of Interpersonal Relations established that ordinary people act as “naive scientists,” utilizing intuitive causal models of human agency, intention, and environmental forces to construct social reality. Wrightsman expanded these concepts by postulating that implicit personality theories operate not only at the level of specific peer evaluations but at the broader, macro-philosophical level of species-wide assumptions. A person’s philosophy of human nature functions as an overarching cognitive schema or worldview through which incoming interpersonal data are filtered, interpreted, and acted upon.

Wrightsman’s model was also heavily influenced by Julian Rotter‘s (1954) Social Learning Theory. Rotter conceptualized behavior as a function of the expectancy that a behavior will lead to a particular reinforcement, coupled with the value of that reinforcement. In ambiguous, novel, or unstructured interpersonal situations, specific expectancies are absent, compelling individuals to rely on generalized expectancies. Rotter later formalized this in his Interpersonal Trust Scale (1967). Wrightsman’s Trustworthiness subscale directly operationalizes generalized expectancies regarding the moral dependability of others, while the Strength of Will and Rationality subscale closely mirrors generalized expectancies regarding internal versus external locus of control.

Furthermore, the instrument reflects historical debates in philosophical and humanistic psychology. The polarity between humanistic psychology (represented by Carl Rogers and Abraham Maslow, who asserted humanity’s innate drive toward constructive growth, altruism, and rationality) and classical psychoanalytic or authoritarian perspectives (which viewed human nature as inherently destructive, animalistic, and needing rigid external control) is explicitly formalized within Wrightsman’s evaluative dimensions. The scale translates centuries of philosophical dialectics—from Thomas Hobbes and Niccolò Machiavelli to Jean-Jacques Rousseau and John Locke—into an empirically falsifiable, psychometric paradigm.

7. Validity

The construct validity of the Wrightsman Philosophy of Human Nature Scale has been substantiated through extensive empirical research utilizing convergent, discriminant, criterion-related, and known-groups validation methodologies.

Convergent and Discriminant Validity

Wrightsman (1964) and subsequent investigators established construct validity by demonstrating robust correlations with established psychometric scales measuring conceptually allied constructs:

• Machiavellianism: Validation studies with Richard Christie’s Mach IV and Mach V scales revealed marked negative correlations between Machiavellianism and the evaluative PHN subscales. Machiavellian individuals, who endorse interpersonal manipulation and pragmatic cynicism, scored significantly lower on Trustworthiness (r = -.50 to -.65) and Altruism (r = -.45 to -.55), validating the hypothesis that misanthropic implicit theories underpin manipulative personality orientations.
• Interpersonal Trust and Faith-in-People: Significant positive correlations were documented between the PHN Trustworthiness and Altruism subscales and Rosenberg’s (1957) Faith-in-People Scale (correlations typically ranging from .55 to .72), confirming strong convergent alignment across measures of generalized interpersonal optimism.
• Political Cynicism: Moderate to strong negative correlations were observed between PHN General Favorability and political cynicism indices (such as Agger, Goldstein, and Pearl’s Cynicism Scale; r = -.35 to -.48). Individuals who view humanity as inherently untrustworthy and selfish predictably express deep distrust toward democratic political institutions, elected officials, and collective civic processes.
• Self-Concept and Psychological Adjustment: Wrightsman demonstrated that individuals exhibiting high self-concept dissatisfaction and emotional maladjustment (assessed via Bills’ Index of Adjustment and Values) scored markedly lower on the evaluative human nature subscales. This aligns with psychoanalytic and cognitive theories suggesting that negative self-evaluations are frequently projected outward onto humanity at large.

Criterion-Related and Behavioral Validity

Experimental and behavioral studies have verified that scores on the PHN scale translate into observable behavioral differences:

• Prisoner’s Dilemma and Game Theory: In experimental matrix games involving cooperation versus exploitation, participants scoring high on Trustworthiness and Altruism displayed significantly higher initial cooperative moves and sustained cooperation in reciprocal conditions, whereas low scorers exhibited preemptive competitive defecting behaviors out of fear of exploitation.
• Bystander Intervention: In simulated emergency and prosocial situations, individuals with elevated scores on Altruism and Strength of Will demonstrated shorter response latencies and higher rates of direct intervention, mediated by their conviction that human distress warrants selfless action and that individual effort can effect change.
• Academic Dishonesty: In observational studies of academic cheating under conditions of varying surveillance, students who scored low on the Trustworthiness subscale were significantly more likely to engage in cheating behaviors, endorsing the self-justifying rationalization that “everybody does it.”

8. Reliability

The psychometric integrity of the PHN Scale was thoroughly documented during its initial scale construction and confirmed in subsequent cross-validation studies across undergraduate, graduate, and community samples.

Internal Consistency and Split-Half Reliability

In his primary psychometric report, Wrightsman (1964) calculated split-half reliability coefficients (corrected using the Spearman-Brown prophecy formula) across multiple cohorts:

• Undergraduate Samples: For male and female undergraduate college students across two testing administrations, split-half reliability coefficients for all six subscales exceeded .60, with 9 of the 12 observed coefficients exceeding .70. Coefficients for Trustworthiness and Altruism were the highest, frequently falling in the .75 to .84 range. Complexity and Variability demonstrated slightly lower, though acceptable, coefficients (.62 to .74).
• Graduate Student Samples: Reliability estimates obtained from graduate students displayed a wider distribution (.40 to .78). Wrightsman attributed the attenuated lower-bound coefficients in advanced academic cohorts to range restriction and homogeneity of socio-philosophical attitudes among specialized graduate student bodies.
• Subsequent Alpha Estimates: Later studies utilizing Cronbach’s alpha (e.g., Robinson, Shaver, & Wrightsman, 1991) confirmed that the 14-item subscales maintain adequate internal consistency, typically reporting alpha coefficients between .70 and .82 for the evaluative dimensions (Trustworthiness, Altruism, Independence, Rationality) and between .65 and .76 for the cognitive dimensions (Complexity, Variability). The composite General Favorability scale consistently displays high internal consistency, with alpha coefficients exceeding .88 due to the additive aggregation of 56 evaluative items.

Test-Retest Stability

Temporal stability assessments reveal that implicit philosophies of human nature function as relatively enduring, trait-like belief structures rather than transient psychological states:

• Over a 3-month test-retest interval among university students, test-retest reliability coefficients for the individual subscales ranged from .65 to .83.
• Wrightsman reported longitudinal stability coefficients over extended intervals (up to 12 months) ranging from .34 to .90 across individual dimensions, with Trustworthiness and Altruism exhibiting the highest long-term stability (consistently > .70). Cognitive structural dimensions (Complexity and Variability) showed greater malleability in response to major life transitions and educational interventions, consistent with cognitive developmental theories.

9. Factor Analysis

Although the initial 1964 development of the PHN scale relied primarily on deductive rational item generation followed by rigorous classical item-analysis procedures (evaluating item-total correlations and discriminating power across extreme quartiles), subsequent factor-analytic investigations by Wrightsman and independent researchers have extensively scrutinized the scale’s latent structural topology.

Exploratory Factor Analyses (EFA)

Subsequent exploratory factor analyses of the 84 items (and of the six subscale total scores) conducted by Baxter (1968), Ashmore (1971), and Wrightsman (1974) revealed a clear, replicable higher-order factor structure consisting of two dominant orthogonal or slightly oblique superordinate dimensions:

• Factor I: General Favorability / Human Optimism: This first major factor accounts for the vast majority of common variance (often between 35% and 48% of explained variance). It is characterized by high positive primary factor loadings from Trustworthiness (loadings typically .75 to .85), Altruism (.70 to .82), Independence (.50 to .65), and Strength of Will and Rationality (.45 to .60). This factor unequivocally reflects an evaluative, valence-based appraisal of humanity—measuring whether people are viewed as morally commendable, benevolent, autonomous, and sensible versus deceitful, egocentric, conformist, and irrational.
• Factor II: Multiplexity / Cognitive Differentiation: The second primary factor is defined by high positive loadings from Complexity (loadings typically .70 to .80) and Variability (.68 to .78). The four evaluative subscales exhibit negligible cross-loadings on this factor (frequently < .20). This factor represents a non-evaluative cognitive dimension capturing the perceived intricate, heterogeneous, and context-dependent nature of human behavior.

Confirmatory Factor Analysis (CFA) Considerations

Modern structural equation modeling and confirmatory factor analyses examining the PHN scale have evaluated whether a six-factor first-order model or a two-factor hierarchical model provides superior fit to the data. Results indicate that while the six individual subscales each retain unique, construct-specific variance that justifies their independent clinical and research profile use, the hierarchical two-factor model (subsuming the four evaluative factors under General Favorability and the two structural factors under Multiplexity) demonstrates acceptable goodness-of-fit indices (e.g., Comparative Fit Index [CFI] ~ .90; Root Mean Square Error of Approximation [RMSEA] ~ .058 to .065).

These factor-analytic findings validate Wrightsman’s conceptualization: a comprehensive assessment of human nature cannot rest solely on an affective continuum of liking or disliking humanity; it must simultaneously incorporate cognitive beliefs regarding human complexity and behavioral variance.

10. Instrument / Measurement Tool

The operational administration, composition, and scoring methodology of the Wrightsman Philosophy of Human Nature Scale are structured as follows:

• Instrument Type: Self-report psychological rating scale (multidimensional inventory).
• Target Population: Adults and adolescents aged 18 and older (extensively validated on collegiate and community adult samples).
• Item Count: 84 items in total, divided into six 14-item subscales.
• Item Balancing: Within each 14-item subscale, exactly 7 items are positively keyed (endorsing the positive pole of the construct) and 7 items are negatively keyed (endorsing the negative pole of the construct), rigorously guarding against acquiescence response sets.
• Response Scale: 6-point forced-choice Likert agreement continuum with no neutral midpoint:
  • +3: Agree strongly
  • +2: Agree somewhat
  • +1: Agree slightly
  • -1: Disagree slightly
  • -2: Disagree somewhat
  • -3: Disagree strongly
• Subscale Composition:
  • Trustworthiness (T): 14 items (7 positive, 7 negative)
  • Altruism (A): 14 items (7 positive, 7 negative)
  • Independence (I): 14 items (7 positive, 7 negative)
  • Strength of Will and Rationality (W): 14 items (7 positive, 7 negative)
  • Complexity (C): 14 items (7 positive, 7 negative)
  • Variability (V): 14 items (7 positive, 7 negative)
• Scoring Procedures:
  • Original Algebraic Scoring: Scores for each item range from -3 to +3 (omitting zero). For positively phrased items, numerical values match the endorsed rating (+3 to -3). For negatively phrased items, scores are reversed (i.e., +3 becomes -3, +2 becomes -2, -1 becomes +1, -3 becomes +3). The algebraic sum across the 14 items yields a subscale score ranging from -42 to +42.
  • Linear Transformation (1 to 6 Metric): In computerized and contemporary survey administration, items are commonly converted to a 1 to 6 scale (1 = Disagree strongly to 6 = Agree strongly). Negatively keyed items are reverse-scored ($$Score_{reversed} = 7 – Score_{raw}$$). Subscale scores then range from 14 to 84, where 49 represents the exact theoretical neutral point.
  • General Favorability Score (PHN Total): Computed as the sum of the four evaluative subscales ($$T + A + I + W$$). On the algebraic metric, scores range from -168 to +168; on the transformed metric, scores range from 56 to 336. Higher scores reflect a highly favorable, optimistic, and trusting philosophy of human nature.
  • Multiplexity Score: Computed as the sum of the two structural subscales ($$C + V$$). On the algebraic metric, scores range from -84 to +84; on the transformed metric, scores range from 28 to 168. Higher scores signify a perception of humanity as highly complex, heterogeneous, and contextually fluid.
• Administration Time: Approximately 20 to 30 minutes for un-timed self-completion.

11. Permissions & Fee and Test Year

The Wrightsman Philosophy of Human Nature Scale was originally published in 1964 in the peer-reviewed journal Psychological Reports. The scale was subsequently elaborated upon and reproduced with normative data, scoring protocols, and interpretative profiles in Lawrence S. Wrightsman’s authoritative book Assumptions About Human Nature: A Social-Psychological Approach (published by Brooks/Cole Publishing Company, 1974).

In accordance with standard academic psychometric practices, the instrument was placed into the academic literature for non-commercial scholarly research and educational purposes. No commercial licensing fees or royalty payments are mandated for independent researchers conducting academic studies, theses, or dissertations. However, commercial application, publication within fee-based testing software, or reproduction in commercial textbooks requires appropriate institutional copyright permissions from the copyright holder (the original publishers or the estate of Lawrence S. Wrightsman, Jr.). Researchers utilizing the instrument must properly cite the seminal 1964 publication and the 1974 monograph.

12. References

• Agger, R. E., Goldstein, M. N., & Pearl, S. A. (1961). Political cynicism: Measurement and meaning. The Journal of Politics, 23(3), 477–506. https://doi.org/10.2307/2127376
• Ashmore, R. D. (1971). The problem of intergroup prejudice. In B. E. Collins (Ed.), Social Psychology: Social Influence, Attitude Change, Group Processes, and Prejudice (pp. 245–296). Intext Educational Publishers.
• Baxter, G. W., Jr. (1968). Factor analysis of the Philosophy of Human Nature scale (Unpublished master’s thesis). George Peabody College for Teachers, Nashville, TN.
• Bills, R. E., Vance, E. L., & McLean, O. S. (1951). An index of adjustment and values. Journal of Consulting Psychology, 15(3), 257–261. https://doi.org/10.1037/h0054777
• Bruner, J. S., & Tagiuri, R. (1954). Person perception. In G. Lindzey (Ed.), Handbook of Social Psychology (Vol. 2, pp. 634–654). Addison-Wesley.
• Christie, R., & Geis, F. L. (1970). Studies in Machiavellianism. Academic Press. https://doi.org/10.1016/B978-0-12-174450-2.50005-5
• Heider, F. (1958). The Psychology of Interpersonal Relations. John Wiley & Sons. https://doi.org/10.1037/10628-000
• Robinson, J. P., Shaver, P. R., & Wrightsman, L. S. (Eds.). (1991). Measures of Personality and Social Psychological Attitudes (Vol. 1). Academic Press. https://doi.org/10.1016/C2009-0-21820-2
• Rosenberg, M. (1957). Occupations and Values. Free Press.
• Rotter, J. B. (1954). Social Learning and Clinical Psychology. Prentice-Hall. https://doi.org/10.1037/10788-000
• Rotter, J. B. (1967). A new scale for the measurement of interpersonal trust. Journal of Personality, 35(4), 651–665. https://doi.org/10.1111/j.1467-6494.1967.tb01454.x
• Wrightsman, L. S., Jr. (1964). Measurement of philosophies of human nature. Psychological Reports, 14(3), 743–751. https://doi.org/10.2466/pr0.1964.14.3.743
• Wrightsman, L. S., Jr. (1974). Assumptions About Human Nature: A Social-Psychological Approach. Brooks/Cole Publishing Company.

13. Items of the Scale