Referring to the score of the Go–No Go (inhibitory control) task, Dubois et al. (2000)’s original article stated as follows:
No error: 3
One or two errors: 2
More than two errors: 1
Patient taps like the examiner at least four consecutive times: 0.
However, it’s not correct to say that if patient imitates the examiner at least four consecutive times is an error, since the presented series (1-1-2-1-2-2-2-1-1-2) and the instructions: when the patient responds with one tap at the examiner’s single tap, it is of course an imitation but he/she is following the given instruction, that it can't be considered as an error.
In the clinical practice, 0 is given for 4 consecutive errors, but to my knowledge no article reported this statement.
Does anyone have any suggestions?
The test measures perseveration. The rational is that if you are repeating the examinator in spite of opposite instructions, you have a set shifting problem. You consider that the first answers were wrong because you subsequently realize that the patient was imitating the observer and not following the instructions, because he did not change strategy when required.
Why did the patient start failing? did he forget the instructions? (then maybe memory is involved) Is he uncapable of inhibiting behaviour when he is not directly focused on doing so? How many time is allowed for him to respond? It's not the same when you have to act immediatly after the instruction than when you have some time to prepare. The meaning of behaviour is not the same, as other variables affect (e.g. speed of processing and psychomotor speed)
As far as I understand from your text is that the paper by Dubois states that 4 consecutive imitations = 0 score, so there you have your report.
What I wonder is why 3 errors are considered more impaired than 2 errors. I suppose that scaling scores is intended for grading severity, but I think that this kind of tests are usually performed close to ceiling, so any one or two errors indicate impairment. Does three errors reflect more inhibition impairments than two errors? Is it not reflected on daily behavior?
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