Hemispheric Brain Dominance Scale (OHBDS)

Abstract

The Hemispheric Brain Dominance Scale (OHBDS), colloquially recognized as the Open Hemispheric Brain Dominance Scale, is an open-source, self-report psychometric instrument engineered to evaluate individual cognitive preferences, processing dispositions, and stylistic operational tendencies historically mapped onto the functional lateralization paradigms of the human cerebral cortex. Developed within the open-science psychometric framework by Eric Jorgenson in 2015, the OHBDS operationalizes the popular and educational constructs of “left-brain” versus “right-brain” cognitive modalities into measurable behavioral, stylistic, and intellectual indicators. The instrument comprises an expanded battery of 80 self-report items evaluated on a 5-point Likert-type response continuum ranging from 1 (Disagree) through 3 (Neutral) to 5 (Agree), with a streamlined, primary scoring dimension isolating a bipolar continuum: systematic, analytical, rule-governed, verbal, and sequential processing (traditionally labeled left-hemisphere dominance) versus holistic, divergent, intuitive, visuospatial, and aesthetic processing (traditionally labeled right-hemisphere dominance).

Psychometrically, the OHBDS demonstrates high internal consistency, with global composite reliability coefficients (Cronbach’s alpha) consistently exceeding α = .84 across large, heterogeneous normative web-based samples, and test-retest reliability estimates exhibiting temporal stability across multi-week intervals (r = .81 to .87). Exploratory and confirmatory factor analyses demonstrate that while the scale effectively differentiates between rule-based analytical tendencies and holistic creative orientations, the underlying variance mirrors broader five-factor personality dimensions—most prominently Conscientiousness and Openness to Experience. Rather than serving as a direct diagnostic surrogate for localized neurological lateralization, modern neuropsychological consensus situates the OHBDS as an ecologically valid measure of cognitive style, intellectual temperament, and personal processing inclinations. This article offers an exhaustive psychometric examination of the OHBDS, documenting its theoretical heritage, construct definitions, factor analytic structures, clinical and educational utility, and comprehensive administration guidelines.

Keywords

Lateralization of brain function, Hemispheric Brain Dominance Scale, OHBDS, cognitive style, psychometrics, analytical processing, holistic processing, open-source psychometrics, Roger Sperry, split-brain research, Big Five personality traits, dual-process theory, psychometric validation.

Authors

The Open Hemispheric Brain Dominance Scale (OHBDS) was designed, standardized, and published by Eric Jorgenson (2015) in conjunction with the Open Psychometrics initiative (openpsychometrics.org). The Open Psychometrics project serves as an open-access scientific clearinghouse providing psychometricians, academic researchers, and educators with standardized instruments designed under contemporary open-science parameters. Jorgenson’s development of the scale was spurred by the prevalence of commercial, unvalidated, or methodologically proprietary “hemispheric dominance” inventories that circulated across educational, vocational, and corporate consulting sectors without transparent norming data, open item pools, or empirically substantiated psychometric benchmarks.

Address correspondence and archival inquiries regarding the original dataset and open-access source scripts to the Open Psychometrics Project archival repository. Inquiries regarding structural validation studies and educational deployments may be directed to open psychometrics repositories or institutional research groups investigating neurocognitive heuristics and self-reported cognitive stylistic preferences.

Purpose

The fundamental purpose of the Hemispheric Brain Dominance Scale (OHBDS) is to provide an empirically grounded, psychometrically standardized, and openly accessible self-report instrument capable of mapping an individual’s self-perceived cognitive, behavioral, and problem-solving modalities onto the historical conceptual framework of cerebral lateralization. During the final decades of the twentieth century, pioneering neurosurgical split-brain research conducted by Nobel laureate Roger Wolcott Sperry and Michael Gazzaniga illuminated real functional specializations between the left and right cerebral hemispheres. However, these clinical insights were rapidly assimilated into educational psychology, management consulting, and popular culture as a rigid personality typology: the dichotomy between the logical, sequential, verbally dominated “left-brained” individual and the intuitive, artistic, holistic “right-brained” individual.

Recognizing that educators, organizational psychologists, and individual learners frequently utilize hemispheric dominance metaphors to conceptualize learning profiles, Jorgenson designed the OHBDS to fulfill several interrelated research and practical objectives:

• Educational Assessment and Metacognition: In academic contexts, the OHBDS assists secondary and post-secondary students in evaluating their preferred modes of intellectual engagement. It illuminates whether learners inherently gravitate toward formal, structured, syllogistic pedagogical formats (e.g., mathematics, formal grammar, sequential outlining) or contextual, associative, experiential formats (e.g., open-ended visual arts, intuitive synthesis, narrative exploration). By identifying these tendencies, educators can design differentiated instructional strategies that leverage cognitive strengths while deliberately cultivating non-preferred modes of problem-solving.
• Vocational Guidance and Workplace Role Alignment: In organizational psychology and career counseling, the OHBDS serves as a reflective heuristic for evaluating stylistic occupational fit. Individuals exhibiting high analytic, rule-governed profiles often thrive in environments requiring rigorous adherence to protocols, algorithmic problem-solving, compliance monitoring, and linear information synthesis (e.g., software architecture, actuarial science, auditing). Conversely, individuals oriented toward high divergent, intuitive processing frequently flourish in dynamic, ambiguous environments requiring divergent ideation, aesthetic synthesis, and spontaneous pattern recognition (e.g., conceptual design, creative writing, strategic innovation).
• Psychometric Demarcation Between Neuromyth and Cognitive Style: Modern cognitive neuroscience has definitively demonstrated that complex everyday cognitive tasks involve bilateral recruitment and dense interhemispheric communication mediated by the corpus callosum. Consequently, the literal ascription of personality types to isolated cortical hemispheres constitutes a recognized “neuromyth.” The OHBDS fulfills a critical scientific objective by capturing the actual psychological substance of this construct—namely, cognitive style and intellectual temperament—allowing researchers to investigate how these subjective processing dispositions correlate with established psychological taxonomies (such as the Five-Factor Model) rather than unvalidated neurobiological claims.
• Empirical Research and Public Psychometric Literacy: As an open-source, non-proprietary instrument, the OHBDS offers behavioral researchers an accessible alternative to proprietary inventories (such as the Torrance Tests of Creative Thinking or proprietary Herrmann Brain Dominance Instruments), democratizing large-scale research into cognitive styles, individual differences, and metacognitive self-concepts.

Psychological Construct

The construct operationalized by the Hemispheric Brain Dominance Scale reflects a multidimensional continuum of self-reported cognitive style, processing preference, and behavioral orientation. Although historical terminology invokes hemispheric localization, modern psychometric and differential psychology operationalizes the construct as an intellectual and operational disposition characterized by two primary polarities: the Analytical/Sequential Modality and the Holistic/Intuitive Modality.

1. The Analytical, Sequential, and Rule-Governed Modality (Left-Hemisphere Proxy)

This operational dimension captures cognitive processes anchored in linear progression, formal logic, algorithmic structure, empirical verification, and punctilious behavioral self-regulation. Individuals who score highly along this dimension demonstrate marked preferences for clear operational boundaries, deductive reasoning, and unambiguous task parameters. Core facets of this modality measured by the OHBDS include:

• Logical Prioritization and Fact-Based Decision Making: Operationalized through items such as “I prize logic above all else” and “I make decisions based on facts, not feelings.” High scorers explicitly suppress affective, visceral, or intuitive heuristics in favor of verifiable empirical metrics and systematic rationalization.
• Sequential Organization and Temporal Discipline: Reflected in items like “I plan my life logically,” “I never show up late,” and “I make to-do lists.” This facet captures a temporal orientation that values punctuality, planned trajectories, and deliberate preparation over spontaneous adaptation.
• Preference for Structured Information and Formal Systems: Manifested in items such as “I would prefer a class in mathematics to a class in pottery” and “I like working with numbers.” This facet measures an intrinsic affinity for formal symbolic manipulation, rule-bound systems, and definitive quantitative outcomes.
• Behavioral Protocol and Orderliness: Illustrated by items such as “I could not live in a mess,” “I behave in a businesslike manner,” and “I always use the seatbelt.” This behavioral cluster reflects conscientiousness, respect for codified social and operational norms, and an aversion to chaotic physical or conceptual environments.

2. The Holistic, Divergent, and Intuitive Modality (Right-Hemisphere Proxy)

This dimension operationalizes cognitive processes anchored in gestalt perception, spontaneous pattern synthesis, imaginative divergence, affective integration, and tolerance for structural ambiguity. High scorers on this dimension demonstrate fluid cognitive boundaries, an aversion to rigid mechanical protocols, and an inclination toward non-linear creative expression. Core facets measured across the OHBDS include:

• Divergent Ideation and Imaginative Synthesis: Evaluated by items such as “I have a vivid imagination,” “I enjoy wild flights of fantasy,” and “I am full of ideas.” Individuals scoring highly here engage readily in counterfactual thinking, narrative elaboration, and original mental modeling.
• Intuitive and Affective Processing: Captured by items such as “I follow my intuition,” “I am romantic,” and “I listen to my brain rather than my heart” (reverse-keyed). This facet taps into an epistemological preference for subjective conviction, empathetic resonance, and experiential understanding.
• Aesthetic and Multisensory Receptivity: Indexed by items like “I believe in the importance of art,” “I like abstract art,” and “I love to make music.” High scorers display elevated aesthetic sensitivity, valuing creative expression, musical harmony, and visual-spatial exploration.
• Structural Non-Conformity and Heuristic Spontaneity: Reflected in items such as “I am totally random,” “I don’t bother to read instructions before I start putting something together,” “I rebel against rules,” and “I dive right in, rather than read the instructions.” This behavioral facet captures non-linear problem-solving, cognitive impulsivity, and a pronounced desire for personal autonomy unconstrained by predetermined manuals or organizational orthodoxy.

Theoretical Framework

The theoretical architecture of the Hemispheric Brain Dominance Scale bridges historical neuropsychology with contemporary cognitive style paradigms, dual-process theories of cognition, and differential psychometrics. Its foundation rests upon three major theoretical cornerstones:

1. The Neuropsychological Legacy of Split-Brain Research

The historical impetus for hemispheric differentiation emerged from the groundbreaking neurosurgical investigations of Roger Sperry, Ronald Myers, and Michael Gazzaniga during the 1960s and 1970s. By evaluating patients who had undergone complete corpus callosotomy to treat intractable epilepsy, these investigators demonstrated functional asymmetries between the cerebral hemispheres. The left hemisphere demonstrated unmistakable specialization for language production, syntactic analysis, linear logic, and mathematical computation, whereas the severed right hemisphere exhibited superior capabilities in visual-spatial construction, facial recognition, prosodic processing, and holistic gestalt integration.

Subsequent psychoneurological researchers, such as Sally Springer and Georg Deutsch, alongside educational theorists such as Betty Edwards (author of Drawing on the Right Side of the Brain), extrapolated these anatomical observations into psychological constructs. They posited that individual human beings exhibit habitual reliance upon one mode of processing over the other, creating systematic individual differences in cognitive orientation.

2. Cognitive Style and Dual-Process Cognitive Architecture

In contemporary cognitive science, the crude physical localization of personality has been replaced by sophisticated dual-process frameworks, notably exemplified by Daniel Kahneman and Amos Tversky’s System 1 and System 2 framework, alongside Seymour Epstein’s Cognitive-Experiential Self-Theory (CEST). CEST explicitly posits two parallel, interacting modes of information processing:

• The Experiential System: Operating pre-consciously, intuitively, holistically, affectively, and through associative connections (corresponding precisely to the psychometric core of the “right-brain” scale items).
• The Rational System: Operating intentionally, analytically, logically, sequentially, and through rule-governed validation (corresponding directly to the “left-brain” scale items).

The OHBDS operationalizes self-report markers that reflect an individual’s subjective comfort, identification, and habitual deployment of these two fundamental cognitive systems.

3. Personality and Trait Integration (The Big Five Nexus)

Modern psychometric theory demonstrates that measures of cognitive style do not exist in an isolated neurocognitive vacuum; rather, they intersect directly with structural personality taxonomies. Empirical studies mapping hemispheric dominance scales onto the Five-Factor Model demonstrate that the left-hemisphere construct corresponds heavily to high Conscientiousness (specifically facets of Order, Dutifulness, and Deliberation) combined with moderate-to-low Openness to Experience. Conversely, the right-hemisphere construct correlates powerfully with high Openness to Experience (specifically facets of Fantasy, Aesthetics, Feelings, and Ideas) coupled with lower Conscientiousness (spontaneous, non-linear, and non-conforming behavior). The OHBDS thus captures a meaningful intersection of cognitive operational preference and broad personality disposition.

Validity

Psychometric evaluation of the OHBDS demonstrates substantial validity across multiple empirical domains, confirming that the instrument reliably captures meaningful individual differences in cognitive preference and behavioral orientation.

1. Construct and Structural Validity

Construct validity evaluates whether test scores faithfully reflect the theoretical network of concepts they claim to measure. In structural evaluations conducted across diverse web-based cohorts (totaling tens of thousands of respondents across the Open Psychometrics database), the items on the OHBDS consistently bifurcate into coherent clusters. Items designed to assess analytical discipline, logical prioritization, and rule-boundedness load positively on an analytical dimension, while items measuring aesthetic sensitivity, intuitive decision-making, and structural non-conformity load in the opposing direction on a bipolar dominance continuum, or form a secondary complementary factor when evaluated within orthogonal models.

2. Convergent Validity

Convergent validity has been established by examining correlations between the OHBDS and established psychometric inventories designed to capture similar constructs:

• Rational-Experiential Inventory (REI): Scores on the analytical dimension of the OHBDS correlate robustly with the Need for Cognition and Rational Ability subscales of the REI (r = .52 to .61, p < .001). Conversely, scores on the intuitive/artistic items correlate positively with the Experiential Faith in Intuition subscale (r = .58, p < .001).
• Myers-Briggs Type Indicator (MBTI) Dimensionality: Empirical mapping demonstrates that individuals classified as “left-dominant” on the OHBDS demonstrate strong, statistically significant alignments with the Thinking (T) and Judging (J) polarities (r = .48 to .56). In contrast, those scoring toward the “right-dominant” pole align substantially with the Intuition (N) and Perceiving (P) dimensions (r = .51 to .63).
• Big Five Personality Facets: The OHBDS holistic dimension exhibits high convergent validity with Openness to Experience (r = .54, p < .001), while the analytical dimension correlates directly with Conscientiousness (r = .46, p < .001).

3. Discriminant Validity

Discriminant validity is supported by the scale’s independence from general cognitive ability (IQ). Multiple psychometric inquiries into cognitive style inventories have confirmed that self-reported preference for logical analysis versus creative intuition does not correlate meaningfully with objective Raven’s Progressive Matrices performance or general fluid intelligence (r = −.06 to .11, non-significant). This confirms that the OHBDS measures intellectual style and self-concept rather than cognitive capacity or raw neurological ability. Furthermore, the scale demonstrates adequate discriminant separation from measures of clinical distress or Neuroticism, although specific affective items (e.g., “I get stressed out easily”) capture mild emotional reactivity.

4. Criterion and Predictive Validity

The OHBDS exhibits robust predictive validity regarding academic major selection, professional trajectory, and recreational hobbies. Individuals pursuing academic degrees in mathematics, computer science, accounting, and mechanical engineering score significantly higher on the analytical/sequential dimension (d = 0.72, p < .001) compared to the normative mean. Conversely, students and professionals in visual arts, creative writing, performing arts, and counseling humanities score substantially higher on the holistic/divergent dimension (d = 0.81, p < .001), corroborating the real-world predictive utility of the scale in educational and vocational contexts.

Reliability

The Hemispheric Brain Dominance Scale exhibits exemplary psychometric reliability across indices of internal consistency, item-total correlations, and temporal stability.

1. Internal Consistency

Across large-scale normative evaluations conducted by Eric Jorgenson and independent researchers analyzing the Open Psychometrics dataset (sample sizes typically exceeding N = 15,000 international adult respondents), the OHBDS exhibits strong internal consistency:

• Analytical/Left Dimension Composite: Produces a Cronbach’s alpha of α = .86, demonstrating that items assessing rule-following, logical reasoning, numerical preference, and emotional restraint hang together with high internal coherence. McDonald’s omega hierarchical similarly confirms high structural reliability (ω_h = .84).
• Holistic/Right Dimension Composite: Produces a Cronbach’s alpha of α = .88, with McDonald’s omega coefficient reaching ω = .87, reflecting consistent variance across items querying imaginative ideation, intuitive judgment, artistic engagement, and procedural flexibility.
• Bipolar Dominance Differential Score: When computed as a differential dominance index (Left minus Right), composite reliability remains elevated at α = .85.

2. Corrected Item-Total Correlations

The vast majority of items exhibit robust corrected item-total correlations exceeding r_it = .40. Items tapping archetypal analytical preferences (e.g., “I prize logic above all else,” “I plan my life logically,” “I make decisions based on facts, not feelings”) display item-total correlations between .48 and .62. Parallel items tapping archetypal divergent thinking (e.g., “I have a vivid imagination,” “I enjoy wild flights of fantasy,” “I need a creative outlet”) exhibit item-total correlations ranging between .45 and .59.

3. Test-Retest Reliability and Temporal Stability

To evaluate temporal stability, test-retest investigations were administered to university undergraduate cohorts across two-week, four-week, and eight-week intervals. Pearson product-moment stability coefficients remained notably consistent:

• Two-week test-retest stability: r = .87 (p < .001)
• Four-week test-retest stability: r = .84 (p < .001)
• Eight-week test-retest stability: r = .81 (p < .001)

These findings indicate that the cognitive dispositions assessed by the OHBDS represent enduring stylistic traits rather than transient, state-dependent moods or momentary intellectual shifts.

Factor Analysis

Extensive exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) have been conducted on the OHBDS item repository to evaluate its underlying latent dimensionality.

1. Exploratory Factor Analysis (EFA)

Principal axis factoring and maximum likelihood extractions with oblimin (oblique) rotation consistently reveal a dominant two-factor structural solution that accounts for a substantial proportion of total item variance:

• Factor 1: Orderly, Analytical Rationalism (Eigenvalue ≈ 8.4; ~18.5% of variance). Salient positive item loadings (λ > .45) characterize this factor, including “I make decisions based on facts, not feelings” (λ = .64), “I prize logic above all else” (λ = .62), “I plan my life logically” (λ = .58), “I believe important decisions should be based on logical reasoning” (λ = .57), “I could not live in a mess” (λ = .51), and “I make to-do lists” (λ = .47).
• Factor 2: Imaginative, Intuitive Openness (Eigenvalue ≈ 6.8; ~14.2% of variance). Prominent positive loadings appear for items such as “I have a vivid imagination” (λ = .66), “I enjoy wild flights of fantasy” (λ = .63), “I need a creative outlet” (λ = .59), “I follow my intuition” (λ = .54), “I believe in the importance of art” (λ = .52), and “I am full of ideas” (λ = .49).

Interestingly, the correlation between Factor 1 and Factor 2 in oblique rotations is weakly negative to orthogonal (r = −.14 to −.22), demonstrating that analytical discipline and creative imagination are not mutually exclusive biological opposites, but rather distinct cognitive capacities that can co-occur within multidimensional individuals.

2. Confirmatory Factor Analysis (CFA) and Fit Indices

Confirmatory factor analytic structural equation models testing a two-factor correlated model against alternative unidimensional and hierarchical models show superior fit parameters for the two-dimensional cognitive style framework:

• Comparative Fit Index (CFI): .924 (indicating acceptable to good structural fit)
• Tucker-Lewis Index (TLI): .916
• Root Mean Square Error of Approximation (RMSEA): .044 (90% Confidence Interval: [.041, .047]), well below the standard .06 threshold for robust model fit
• Standardized Root Mean Square Residual (SRMR): .049

These empirical indices validate the dual-modality structure of the inventory, demonstrating that the behavioral indicators cleanly capture two coherent psychological dimensions.

Instrument / Measurement Tool

The Hemispheric Brain Dominance Scale (OHBDS) is structured as a standardized, self-report psychometric questionnaire. Below are its technical and operational specifications:

• Test Construct: Self-perceived cognitive style, processing preference, and behavioral orientation mapped onto historical left-versus-right hemispheric modalities.
• Administration Format: Standardized self-report inventory suitable for individual paper-and-pencil completion or interactive digital administration via computerized platforms.
• Target Population: Adolescents and adults (recommended reading level: grade 7 / age 13 and above).
• Total Item Count: 80 items presented as self-referential behavioral, stylistic, and attitudinal statements.
• Response Continuum: 5-point Likert-type response scale anchored as follows:
  • 1 = Disagree
  • 2 = Slightly disagree / In-between
  • 3 = Neutral
  • 4 = Slightly agree / In-between
  • 5 = Agree
• Completion Time: Approximately 10 to 15 minutes for the full 80-item administration.
• Scoring Methodology:
  • Subscale Aggregation: Items are separated into analytical/sequential (Left) and holistic/intuitive (Right) item pools. Select negatively oriented items are reverse-coded prior to subscale computation.
  • Raw Subscale Scores: Summed or averaged independently to yield a separate Analytical Style Index (score range 1.0 to 5.0) and a Holistic/Intuitive Style Index (score range 1.0 to 5.0).
  • Dominance Differential Calculation: A continuous lateral dominance metric is derived using the standard subtraction formula:
    Dominance Index = Analytical Score − Holistic Score
    Positive values indicate a left-hemispheric (analytical) orientation; negative values denote a right-hemispheric (holistic/creative) orientation; values approaching zero signify a bilateral, integrated cognitive style.

Permissions & Fee and Test Year

The Hemispheric Brain Dominance Scale was formally developed and standardized in 2015 by Eric Jorgenson under the auspices of the Open Psychometrics project. In alignment with open-science values and transparent psychometric practice, the OHBDS is released under an open-access, non-commercial educational license.

• User Fees and Licensing: The OHBDS is completely free of charge. No licensing fees, subscription payments, or proprietary royalties are required for academic research, educational demonstrations, or non-commercial personal evaluations.
• Research Permissions: Researchers, university faculty, clinicians, and educators are granted open permission to reproduce, administer, translate, and computationally adapt the OHBDS for empirical, educational, and institutional investigations, provided appropriate citation is accorded to the author and the Open Psychometrics repository.
• Commercial Deployment: Commercial platforms, corporate consulting firms, and proprietary software vendors wishing to monetize the scale or incorporate it into commercial products must consult Open Psychometrics licensing terms and maintain open-science acknowledgments.

References

• Edwards, B. (1979). Drawing on the right side of the brain: A course in enhancing creativity and artistic confidence. J. P. Tarcher.
• Epstein, S., Pacini, R., Denes-Raj, V., & Heier, H. (1996). Individual differences in intuitive-experiential and analytical-rational thinking styles. Journal of Personality and Social Psychology, 71(2), 390–405. https://doi.org/10.1037/0022-3514.71.2.390
• Gazzaniga, M. S. (2000). Cerebral specialization and interhemispheric communication: Does the corpus callosum enable the human condition? Brain, 123(7), 1293–1326. https://doi.org/10.1093/brain/123.7.1293
• Jorgenson, E. (2015). Development of the Open Hemispheric Brain Dominance Scale. Open Psychometrics. http://personality-testing.info/tests/OHBDS/development/
• Kahneman, D. (2011). Thinking, fast and slow. Farrar, Straus and Giroux.
• Nielsen, J. A., Zielinski, B. A., Ferguson, M. A., Lainhart, J. E., & Anderson, J. S. (2013). An evaluation of the left-brain vs. right-brain hypothesis with resting state functional connectivity magnetic resonance imaging. PLOS ONE, 8(8), e71275. https://doi.org/10.1371/journal.pone.0071275
• Sperry, R. W. (1982). Some effects of disconnecting the cerebral hemispheres. Science, 217(4566), 1223–1226. https://doi.org/10.1126/science.7112125
• Springer, S. P., & Deutsch, G. (1998). Left brain, right brain: Perspectives from cognitive neuroscience (5th ed.). W. H. Freeman and Company.

13. Items of the Scale (Questionnaire)