Editing Talk:1453: fMRI
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..."In real experiments, reported activity patterns are always a result of subtracting average brain activity from many samples gathered during task from so called resting-state activity" | ..."In real experiments, reported activity patterns are always a result of subtracting average brain activity from many samples gathered during task from so called resting-state activity" | ||
− | Actually, task activation is generally compared to some other control task or condition, rather than resting state, especially for a short-term memory study such as that referenced in the comic. For example some other task with matched stimulus presentation and response demands (i.e. press a button), but without any memory load. And if rest were used as the implicit baseline, it is extremely unlikely any actual subtraction would be done--rather the so-called resting state would be the implicit baseline state of a multiple regression, in which the task-related predictor variables are convolved with a canonical hemodynamic response function. {{unsigned ip|108.162.219.118 | + | Actually, task activation is generally compared to some other control task or condition, rather than resting state, especially for a short-term memory study such as that referenced in the comic. For example some other task with matched stimulus presentation and response demands (i.e. press a button), but without any memory load. And if rest were used as the implicit baseline, it is extremely unlikely any actual subtraction would be done--rather the so-called resting state would be the implicit baseline state of a multiple regression, in which the task-related predictor variables are convolved with a canonical hemodynamic response function. {{unsigned ip|108.162.219.118}} |
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