The CPT-II software tracks the rate of omission errors (failing to press the space key when appropriate), commission errors (pressing the space key when inappropriate), and
perseverations (a reaction time to any stimulus that is < 100 milliseconds).
At the end of resection,
perseverations occurred at which point resection was terminated (see Figure 4).
The following standardized T-score measures were used: omissions, commissions, reaction time standard error, variability,
perseverations, reaction time block change, and reaction time inter-stimulus interval change.
The same study also suggested that a greater mental flexibility (or fewer
perseverations) in cocaine-abusing subjects with antisocial traits and high levels of violence could increase the chances of their committing an offence but avoiding any negative consequences of such behaviour (Rosse et al., 1993).
Seven measures were removed from subsequent multivariate analyses because of lack of variation in the task performance (e.g., ceiling or floor effects): BLC mean percent correct, DMS percent correct (simultaneous), and IED stages completed and four VRM measures: immediate free recall total novel words, immediate free recall total
perseverations, immediate recognition total false positives, and delayed recognition total false positives.
Experiencing their
perseverations over seven seasons has been, at times, unbelievably frustrating: Tommy's two concubines approach and repel him like magnets that reverse their charges each morning, Pasquale and Lombardi's characters rarely stray far from low comedy, andthe see-saw on which every other episode seems to hingeTommy routinely jumps on and off the wagon.
Scores derived from the test were the total number of missed responses (omissions), false positives (commissions),
perseverations (repeated hits), and the overall average reaction time.
Errors or slips in any domain tend to be classifiable as anticipations (a unit appearing too early),
perseverations (a recurring element), exchanges (or metatheses) of elements, or substitutions of one element for another (such as calling one person by another person's name).
Subsequent examination of the data has also shown that the increased differences between the groups in the number of errors made in the alternating visual search were due largely to the number of failures to switch between stimuli after a successful response (
perseverations), supporting the interpretation that the groups differed in the efficiency of this aspect of EE There was a greater increase in other types of error from the single target search task in the poor attention group than the good attention group, but the difference was small and non-significant.
When non-perseverative intrusions are more frequent than
perseverations, performance in the non-identical condition tends to be inflated (and therefore, chances to observe RD are artificially augmented).
A related phenomenon noted by Freud involves the "very frequent repetition of the same word in writing and copying -- '
perseverations'" (1901/1960, pp.128-129; compare, cataphasia or catalogia: prolonged repetition of meaningless words).