Task 6 - Neuroimaging Experiments Flashcards
What is the basic logic behind cognitive subtraction?
Comparing the activity of the brain in a task that utilizes a particular cognitive component to the activity of the brain in a baseline task.
Which assumptions do RT paradigms and cognitive subtraction in common?
Pure insertion and non-interaction
What is the goal of constructing a control task?
Replicating the experimental task as closely as possible but without the cognitive component of interest.
Which assumption is not needed for cognitive conjunction paradigms?
Non-interaction
What is the basis of a parametric design?
Treating the independent variable as a continuous dimension and varying it accordingly
What otherwise fundamental part is not needed in a parametric design?
A control condition
When the nature of the correlation of interest is non-linear, what experimental design is most useful?
Parametric
What is a problem of parametric designs?
Increasing the independent parameter can induce activation of additional cognitive processes and brain regions.
Stimulus-presentation can mostly be done …
blocked and event-related
What has lower sensitivity: Blocked or ER designs?
ER
What is the logic behind behaviorally driven fMRI?
Letting the the subject act on their own volition and correlating brain activation with different states afterwards.
Which paradigm can specify the activation corresponding to a task more precisely by filtering out interaction effects with confounders?
Conjunction Designs
In Trojano’s Experiment, they used the clock test, a visual clock test, and a non-spatial clock test. Describe how cognitive subtraction is done here.
The clock test involves spatial imagination. The visual clock task only the spatial manipulation, so here the imaginary part can be filtered out. In the non spatial clock test, neither the imagination nor the spatial manipulation is present, which can be used as baseline control.
What statistical advantage do blocked designs have?
More power
