Test for Handedness

Abstract

The Test for Handedness, developed by Crovitz and Zener in 1962, is a brief, self-report instrument designed primarily to screen research participants for hand- and eye-dominance. It was conceived as an essential initial step for selecting individuals to participate in experiments that explored the complex relationship between various forms of laterality and perception. This measure is structured around 14 distinct items, utilizing a standard 5-point rating response scale. A significant limitation noted in the original documentation is the absence of detailed psychometric data, as no reliability or validity evidence was provided during the test’s initial publication.

Keywords

Handedness, Test Development, Laterality, Eye Dominance, Measurement, Test Construction, General Assessment Tools

Authors

Crovitz, Herbert F., Zener, Karl

Purpose

The central purpose of the Test for Handedness is to efficiently assess an individual’s preference and skill profile regarding manual and ocular dominance. This assessment facilitates the categorization of participants based on their laterality, which is crucial for controlled experiments in cognitive psychology and neuroscience.

By providing a standardized measure of handedness, the instrument allows researchers to account for functional asymmetry, ensuring that experimental samples are either homogeneous regarding laterality or are adequately distributed to study laterality effects on specific tasks.

Construct

The primary construct measured by the instrument is Handedness. As conceptualized by Crovitz and Zener (1962), this construct is comprehensive, encompassing not only the habitual preference for using the right or left hand (manual dominance) but also the related concept of ocular dominance (eye dominance).

The scale aims to quantify the degree of functional asymmetry, moving beyond a simple dichotomy (left vs. right) to capture a range of preferences often associated with cerebral organization and specialization.

Validity

No specific validity evidence was reported or indicated during the initial publication or development of the Test for Handedness (Crovitz & Zener, 1962). This implies that standard forms of validation, such as content validity (ensuring items adequately sample the domain), criterion validity (correlating scores with external measures of handedness), or construct validity, were not formally documented.

Researchers relying on this scale often utilize it based on its strong face validity, given that the items directly address observable behaviors related to dominance. However, caution is advised, as the instrument’s accuracy in measuring the underlying theoretical construct remains empirically unsupported by the original authors.

Reliability

The original reference and source materials explicitly state that no reliability metrics were provided for the Test for Handedness. Consequently, fundamental indicators of measurement precision, such as internal consistency (e.g., correlations between items) or test-retest reliability (stability of scores over time), are unavailable from the foundational documentation.

The lack of reported reliability means that the consistency and precision of the scores derived from this 14-item scale cannot be definitively established based on the primary source material, necessitating external replication or psychometric verification if the scale is used in contemporary research.

Factor Analysis

No factor analysis was indicated or reported for the Test for Handedness during its development phase. Factor analysis is a statistical technique used to explore the underlying dimensions of a scale.

Without factor analytic data, the structure of the test—whether the 14 items measure a single factor of general laterality or separate factors for manual and ocular dominance—remains an assumption. The test is generally interpreted as a composite measure intended for screening rather than a tool for detailed structural analysis.

Instrument

Test Type: Test / General Assessment Tool

Format: The test consists of 14 items, which are administered using a self-report format. Responses are captured on a 5-point rating response scale, allowing for nuanced scoring beyond simple binary choices.

Language Available: English (Original development language)

Population Group: Human; Male; Female

Age Group: Adulthood (18 years & older)

Population Details: The initial research sample used for the test’s development consisted of University Students located in the United States. This demographic focus suggests the instrument is most appropriate for use with adult populations in academic settings.

Test Methodology: The assessment methodology involves participants rating their preference and proficiency across the 14 items. Due to the stated lack of specific reliability or validity tests in the original source, the primary methodological focus is on the collection of descriptive data regarding lateral preference.

Keywords

Crovitz and Zener, Hand Dominance, Ocular Laterality, Psychological Measurement, Screening Tool, Psychometric data

Authors

Author ORCID Identifier: Not provided in source material.

Affiliation Email addresses: Not provided in source material (Contact information for 1962 publication is often historical and unavailable).

Correspondence Address: Not provided in source material.

Permissions & Fee and Test Year

Test Year: 1962

Permissions and Fees: The Test for Handedness is an older measure, and the test items are not generally available in the public domain. Interested researchers seeking to use the instrument are advised to contact the original publisher, The American Journal of Psychology, or the institutional archives associated with the authors for permission and access to the full scale.

Reference’s

Crovitz, H. F., & Zener, K. (1962). A group-test for assessing hand- and eye-dominance. The American Journal of Psychology, 75(2), 271–276. The full article discussing the scale’s development can be accessed via the digital object identifier: https://doi.org/10.2307/1419611

Items of the Test for Handedness

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

The specific items comprising the 14-item Crovitz and Zener (1962) Test for Handedness are not available in this entry. To obtain the original scale items and necessary scoring instructions, interested parties must contact the publisher or secure a reprint of the original 1962 article referenced above.