Minnesota Percepto-Diagnostic Test

Purpose: Designed to measure visual perception and visual-motor abilities.

Population: Ages 5 and over.

Score: Not indicated.

Time: (8) minutes.

Author: Gerald B. Fuller.

Publisher: Clinical Psychology Publishing Company, Inc.

Description: The Minnesota Percepto-Diagnostic Test (MPD), is a clinical and educational test constructed to measure visual perception and visual-motor abilities in children and adults. The MPD offers prompt, objective evidence of differential status, providing measures that may be used in conjunction with other information to 1) discriminate among visual, auditory, and mixed learning disabilities; 2) classify children’s behavioral problems as normal, emotionally disturbed, schizophrenic, or organic; and 3) diagnostically separate normal, brain-damaged and personality-disturbed adults.

Scoring: Scoring involves an evaluation of reproduced figures in terms of degrees of rotation, distortion, and separation. Scores are then transferred to a diagnostic summary sheet.

Reliability: Split-half reliabilities for the MPD range from .52 (for 12 year-old subjects) to .86 (for 5 year old subjects) with a median of .60. In terms of test-retest reliability, using a three-month retest interval, stability coefficients range from .53 with 9 year-old subjects to .70 with 20 year-old subjects. Using a one-year interval, coefficients range from .37 to .60. Parallel form reliabilities (uncorrected) have a median value of .47 (median corrected value of .84).

Validity: Using rotation scores with a sample of 657 adults, the MPD correctly classified 81% as normal (N = 267), personality-disturbed (N = 211), or brain-damaged (N = 179). With 1,872 children, rotation scores correctly classified 82% as normal (N = 1,287), emotionally disturbed (N = 339), or either brain-damaged or schizophrenic (N = 246). The MPD rotation scores could not distinguish between schizophrenic and brain-damaged children. With respect to children’s reading ability, for a sample of 703 children, 90% could be appropriately diagnosed as demonstrating good reading, primary reading retardation, secondary reading retardation, or brain-damaged reading. The manual cites investigations indicating 85% and 78% hit rates, respectively, in differentiating between organic and nonorganic children.

Norms: The normative sample includes 4,000 children and adolescents (aged 5-20 years) and 657 adults.

Suggested Uses: The MPD is recommended as a brief screening device of learning disabilities and behavior problems in clinical or research settings.