Coding A and coding B of the WISC are not equivalent tasks

Area of Science:

• Neuropsychology
• Educational Psychology
• Developmental Psychology

Background:

• The Wechsler Intelligence Scale for Children (WISC) is a widely used tool for assessing child intelligence.
• Coding A and Coding B are subtests within the WISC, designed to measure visual-motor coordination and processing speed.
• Understanding the equivalence and specific cognitive functions tapped by these subtests is crucial for accurate interpretation of WISC scores.

Purpose of the Study:

• To investigate the psychometric equivalence of the WISC Coding A and Coding B subtests.
• To determine if significant differences exist in performance between Coding A and Coding B in children with and without minimal brain dysfunction.
• To explore the potential relationship between performance on these subtests and hemispheric processing modes.

Main Methods:

• Administered WISC Coding A and Coding B to 50 subjects with minimal brain dysfunction and 75 controls.
• Participants' ages ranged from 7 years, 8 months to 8 years, 3 months.
• Subjects were divided into two age strata: below and above 8 years old.

Main Results:

• Significant differences were found between standard scores for Coding A and Coding B.
• These discrepancies suggest that Coding A and Coding B are not equivalent measures.
• Performance variations may indicate the involvement of distinct information-processing modes linked to hemispheric dominance.

Conclusions:

• The WISC Coding A and Coding B subtests are not interchangeable due to significant performance differences.
• Coding A should not be used for calculating IQ scores.
• Coding B is a valuable measure that should be retained for separate utilization due to its direct relation to symbol learning.