Practice question · True or false
The colours on an fMRI image show absolute brain activity in that region.
Hints
- What is being compared?
- Every fMRI image is a difference image.
Show the answer
False
Why
False. The image shows a small statistical difference in blood oxygenation between two conditions, thresholded and colour-coded, never absolute activity. That is why the choice of control condition determines what appears, and why an image with no stated comparison is uninterpretable.
Practise Brain Imaging Techniques
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