TABLE 2.
Measure | Method of Scoring | Interpretation of Score | |
---|---|---|---|
Total correct | Number of correct responses | Traditional measure | |
Total dyads | Correct responses after ≥1 other correct response | Extent to which participants continue to hold PASAT digits in working memory while calculating sums, ie, performing the test according to instructions. A higher score indicates better working memory. | |
Total chunking | Correct responses after a skipped response | A cognitive strategy for reducing required working memory and attentional workload. A higher score indicates poorer working memory. | |
Total “other” responses | Correct responses after an incorrect response (ie, total correct responses not considered dyads or chunking) | This score reflects an attempt to perform the task correctly, meaning that the task is more taxing on working memory and attentional processes than with chunking. | |
Dyads as % of total correct responses |
|
Proportion of total correct responses accounted for by dyads. | |
Chunking as % of total correct responses |
|
Proportion of total correct responses accounted for by chunking. | |
Cognitive fatigue | Yes, if participants made fewer correct responses in 2nd half of a trial than in 1st half. No, if correct responses in 2nd half equal or exceed those in 1st half |
Cognitive fatigue suggests inability to sustain attention while engaging working memory over course of a trial. |