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As of 2017, there are five task fMRI protocols. Each uses the 2017 HCP fMRI protocol with TR = 800 ms.

1st: Hand grip

Target force50%
Total duration414 scans
Baseline75 scans
Task duration38 scans
Number of repeats3
Repeat interval113 scans

2nd: Valsalva

Target pressure30 mmHg
Total duration414 scans
Baseline75 scans
Task duration23 scans
Number of repeats3
Repeat interval113 scans

3rd: Inspiratory Loading

Target pressure-30 mmHg
Total duration414 scans
Baseline75 scans
Task duration25 scans
Number of repeats3
Repeat interval113 scans

4th: Breath hold

Total duration414 scans
Baseline75 scans
Task duration38 scans
Number of repeats3
Repeat interval113 scans

5th: Stroop

Total duration224 scans
Baseline0 scans
Task type duration56 scans
Number of repeats2

Rationale behind order

  1. Hand grip
    1. The easiest task to understand
    2. Gets people used to seeing screen, task on/off
    3. It is related to the hand grip max, which was the last thing performed (as people go into the scanner)
  2. Valsalva
    1. Most important, so do as soon as possible
    2. Most important, so do after a run-through with hg - subjects already familiar with viewing screen
  3. Inspiratory loading
    1. Next most important
    2. Closely related to Valsalva
  4. Breath hold
    1. Equally important to inspiratory loading
    2. Simpler, easier to do at end when subject may be tired
  5. Stroop
    1. Exploratory, so least important if we don't get it
    2. Short, can easily determine if will get completed within time
    3. Different to everything else
    4. Can set up button box when walking into scanner during previous tasks (plug in box, set up configuration, test key entries)
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