ImPACT Version 4

Administration and Interpretation Manual

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Scoring

Table of Contents

All tests are automatically scored within the software. In addition to scores that are provided for each module, composite scores, a symptom score, measures of efficiency, validity, and a Reliable Change Index (RCI) score are all calculated. Each of these are discussed below.

Module Scores#

Each module has a set of scores that are unique to that module. Scores were designed to reflect speed of performance or accuracy, which are the two primary components measured by the test. Each of the modules and the associated scores are presented below.

Word Memory
Hits (immediate) Number of correctly identified words (out of 12)
Correct distracters (immediate) The number of correctly identified distracter items (out of 12)
Learning percent correct ((Hits + correct distracters)/24) X 100.
Hits (delay) Number of correctly identified words (out of 12)
Correct distracters (delay) Number of correctly identified distracter items (out of 12)
Delayed memory percent correct Delay hits + correct distracter delay items (out of 12)
Total percent correct Average percent correct (learning percent correct + delayed percent correct/2)

Design Memory
Hits (immediate) Number of correctly identified designs (out of 12)
Correct distracters (immediate) Number of correctly identified incorrect distracter items (out of 12)
Learning percent correct ((Hits + correct distracters)/24) X 100
Hits (delay) Number of correctly identified designs (out of 12)
Correct distracters (delay) Number of correctly identified distracter designs (out of 12)
Delayed memory percent correct Delay hits + correct distracter items (out of 12)
Total percent correct Average percent correct ((learning percent correct + delayed percent correct)/2)

X’s and O’s
Total correct (memory) Measures the number of correctly identified items (total possible correct =12)
Total correct (interference) This score provides a measure of the number of correct responses on the interference test
Average correct RT (interference) Measures the average reaction time for correct responses on the interference (distracter) test
Total incorrect (interference) Measures the number of errors on the distracter test
Total incorrect RT (interference) Provides an index of the reaction time for incorrect responses on the interference test

Symbol match
Total correct (visible) Provides the number of correct matches out of 27 when the symbol number pairings are visible
Total correct RT (visible) The average reaction time for the 27 matches
Total correct (hidden) This represents the number of items correctly recalled when symbol number pairings are hidden
Total correct RT (hidden) The average reaction time for recall of the memory items

Color Match
Total correct Number of correct matches
Average correct RT Average reaction time for correct matches
Total commissions Number of incorrect for color/word matches
Average commissions RT Average reaction time for commissions

Three Letters
Total sequence correct Total number of letter sequences correct (out of 5)
Total letters correct Total letters correct (out of 15)
Percent of total letters correct Percent letters correctly identified
Average time to first click Time to initiation of first click of mouse
Average counted The average number of numbers clicked, regardless of errors
Average counted correctly The average number of numbers clicked that are in correct sequence

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