kpnl:acq_day_procedures
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Table of Contents
Before the participant arrives
- Swap out the amplifier battery with the fully charged battery on the charger
- Confirm that headcaps and electrodes are clean and dry
- Prepare supplies
- Fill syringes with SignaGel
- Double adhesive collars
- Cable wraps
- Paper towels
- External electrodes
- Check that the head caps and electrodes are clean and dry
- Test Button-box
0_dio_test.psyexp
- Test DIO codes
0_dio_initialize.psyexp
When the Participant Arrives
- Have the participant read and sign consent form
- Use the correct form depending on whether they want SONA or monetary compensation
- Don’t forget you need to sign the consent form too
- Describe an overview of the procedure and experiments
- Ask the participant to complete the STAI questionnaire
- Put the completed questionnaire under my door (or through the mail slot)
- Make sure the participant understands the length of time they will be in the experiment and ask if they’d like to use the restroom
- No chewing gum, hair down evenly, no hoodies
- Electronics should be left outside the recording chamber
- Jewelry should be removed, but can be put on the side table in the recording chamber
- Log arrival time
Participant Preparation
- Determining proper head cap size: measure in cm
- Measure head circumference just above the eyebrows and over the inion
- 54-58 cm: Medium Cap (RED)
- 56-60 cm: Medium/Large Cap (RED and BLUE)
- 58-62 cm: Large Cap (BLUE)
- Apply external electrodes (this can be done before the cap if necessary)
- Be sure the electrode collars are not covering the active part of the electrode
- Reference
- EX1 left mastoid
- EX2 right mastoid
- Horizontal electroculogram
- EX3 next to left outer canthus
- EX4 net to right outer canthus right (if applicable)
- See here for approximate location.
- Vertical electroculogram
- EX5 and below the left eye
- EX6 (if applicable) above the the left eye
- See here for approximate location.
- Put on cap
- If the participant requires glasses, have them wear them during cap fitting
- Visually inspect the cap to ensure it is on straight
- Determine proper vertex location (i.e., electrode Cz)
- Anterior/posterior - Measure nasion to inion (divide by 2)
- Left/right - measure from left to right preauricular area (divide by 2)
- Double check that the cap is still straight now that you’ve made your adjustments
- Ensure that the cap’s tag at the O1, Oz, O2 electrodes is pulled out
- Apply gel to cap electrode holders
- Build columns of gel: fill from syringe, move hair around
- If participant is bald or has very short hair, start with minimal gel to avoid pooling
- Insert electrodes into cap
- Be very careful not to stress the electrode leads where the wire meets the electrode
- Wrap CMS/DRL three or four times around ribbon cables & EX leads
- Secure with cable wrap at nape of neck and also below the wraps
- Bring the participant into VERONICA
Checking electrode connections
- Confirm that the blue light “CM in range” is on and not blinking
- If the light is blinking, check that the CMS and DRL electrodes have sufficient gel and are properly connected
- Open the ActiView acquisition software and press the
Startbutton - Confirm that the battery indicator is at least half full
- Select the
Electrode Offsettab- Ensure that the offsets are all within ±40 mV
- Ensure that the offsets are stable (not bouncing)
- Select the
Monopolar Displaytab- Disable filters and reference
- Observe signals
- If any signals appear unstable (e.g., slow drift or lots of noise), add a bit more gel
Data Acquisition
- Select
Start Filebutton on lower-right side of ActiView Screen - Select
OKon the pop-up window - Specify the filename
- At this point the file has been created but is not recording
- The stimulus computer will trigger the recording at the start of the experiment
- At the end of the experiment press
Stop
After the Experiment
- Turn off power and disconnect the battery from the amplifier
- Disconnect the electrodes from the amplifier
- Press the white tabs to remove the ribbon cable connectors
- Carefully remove the cap and EX electrodes
- Set cap and electrodes aside
- Debrief the participant
- Compensate the participant
- Turn Wi-Fi back on (stimulus control and EEG acquisition computers)
- Restart Google Drive (stimulus control and EEG acquisition computers)
Cleaning Up
- Remove the adhesive collars from the EX electrodes and set aside
- Remove the EEG electrodes from the cap
- Do not pull on the lead or cause any strain where the lead connects to the electrode
- Fill a plastic bucket with warm water (never hot) and submerge the electrodes
- Be sure that the connector end of the lead is kept dry!
- Clean the electrodes in the water
- Avoid touching the active part of the electrodes
- The electrodes are clean when they no longer feel slimy (no more gel residue)
- Set electrodes on a wee-wee pad to dry
- Splay them out and untangle any tangled leads
- Clean the gel out of the electrode holders by spraying water through the holes
- Clean the cap in a bucket of warm water
- A small amount of Dove soap can be used
kpnl/acq_day_procedures.1488230201.txt.gz · Last modified: 2017/02/27 16:16 by admin