This is the code used to stimulate adults and children with radial checkerboard blended with animated cartoons.
This code relies on a number of external libraries:
Prior to run the code all the libraries should be installed. The recording system must be connected on the same network to be visible. Connection should be set up in accordance with the recording system configuration. We use a NIRSport 8x8 with Aurora Software 14.0. This is the configuration for our system:
info = StreamInfo(name = "Trigger", type = "Markers",
channel_count=1, channel_format='int32',
source_id='Aurora')
outlet = StreamOutlet(info)With this configuration you can send triggers to the recording system using the command:
outlet.push_sample(['event name'])This script shows a radial checkerboard stimulus sending two kinds of event markers:
| Event | Marker | Contrast | Sample |
|---|---|---|---|
| blank | 1 | 0% |  |
| stimulus | 2 | 90% |  |
- trial_number Number of blank and stimulus trials (The total number of trials is trial_number*2 )
- time_stim Duration of events in seconds
- time_intertrial duration of intertrial time in seconds
- freq Contrast reversal frequency in Hz
To change stimulus features read Psychopy radialstim
To change other parameters such as luminance and contrast read Psychopy3 manual.
This script shows a radial checkerboard stimulus blended with an edge filtered animated cartoon. During baseline it shows a low contrast grayscale animated cartoon. It sends two kinds of event markers:
| Event | Marker | Contrast | Sample |
|---|---|---|---|
| blank | 1 | 0% |  |
| stimulus | 2 | 90% |  |
- number_of_trials Number of stimulations (contrast inversion) and blanks (no changes in contrast) trials [the total number of triggers delivered is number_of_trials * 2]
- intertrial intertrial duration in secs
- tex_dur stimulation duration in secs
- start_sec Start the movie from this second
- stim_freq Stimulus contrast inversion frequency in Hz
- cnt_stim image contrast during stimulation [0 to 1]
- cnt_baseline image contrast during baseline [0 to 1]
- luminance mean luminance [0 to 1]
- gamma monitor gamma