EEG at Loeffler

The current first-floor Loeffler building EEG collection first started in March-May 2022. And is used for Habit EEG Protocol (and maybe eventually SPA EEG). 7T EEG had some but not all data collected here. Both Habit and 7T data are stored in /Volumes/Hera/Raw/EEG/

• For setup, see Loef EEG Setup
• Bucket Test
• Faraday Cage

• ADC-Box Battery should be charged between sessions
• Make sure that the orange (charging) light is always on when plugged in
• Dr. Salisbury's group taught us to leave battery plugged in when not in use (assuming overcharge protection)

2024-12-13 - battery loosing charge capacity?

• Reward Learning and Habituation Task (Habit Study (R37)) for reward feedback
• Auditory Steady State Response (Brain Mechanisms R01 (7T)) passive listening to click trains
• Using “ foam eartips” cortech ¹⁾
  • transducer/air: loudspeaker variable timing, frequency
  • normal headphones would interfere with signal

• TTL sent over parallel port from presentation computer to control unit. see EEG Remarking Status Channel

From Smith 2025-03-25 (correspondence with NR) with emphasis added

Unplugging, turning off, and turning back on cannot fix the CM out of range problem. Handling the cables may affect whether a partially broken cable works or does not. When you perform a bucket test, it is important to manipulate the cables, especially near the electrode end and the cable end, to see if manipulating these weak areas reveals an intermittent fault. Also, as time passes, gel may make its way from on top of the hair to the scalp at the critical CMS and DRL sites. Contact quality tends to improve with time as gel gets down to the scalp, but also as it wets the skin. With a participant who has very dry skin on the scalp, you might see a flashing blue light simply because of insufficient contact quality at CMS and DRL.
When the blue light flashes with electrodes connected, unplug everything but CMS/DRL at the AD box to see if the problem persists with only those electrodes. If so, either CMS or DRL is broken or one or both lacks the quality of contact needed for the system to operate.

If a faulty electrode is connected to the system but not touching the body, the blue CM in Range light could be on if everything else was connected well. I am actually not certain whether a faulty EXG electrode being connected to the system but not the body would cause the CM in Range light to flicker. But, when that faulty electrode is connected to the body, it would cause the CM in Range light to flicker if it was already burning solid blue. If the CM in Range light was not already burning solid blue, then there could be a different reason, namely whether CMS and DRL were well connected to the body..