University:
Boston University
Course:
CAS CS 501 | Computer Science Practicum
Academic year:

2024
Views:

416

Pages:

20
Author:

Damian Mcfarland

Let’s analyze some fNIRS data: Homer2_UI When opening Homer2, you need to select: • The dataset(s): a folder containing at least one .nirs file • The data processing stream: a .cfg file. If you hit ‘Cancel’, a default process stream will load. • Start Homer2 • When prompted to select a .nirs folder, navigate to and select folder \fNIRS_COURSE_2018\EXERCISES\Ex1_Basic_data_analysis\1-basic-steps • When prompted to select a .cfg file, select my_simple_processing.cfg file we just created. \fNIRS_COURSE_2018\EXERCISES\Ex1_Basic_data_analysis\1-basic-steps\my_simple_processing.cfg Note: If you’re already in Homer2 and need to change the .nirs directory or the .cfg file: • Go to File > Change Directory, and select your nirs folder • Go to File > Load Process Options (*.cfg) and select your .cfg file Homer2_UI Data time series .nirs files in your folder Modify options and run processing stream Source / detector geometry Display options What data type to display Displaying the raw fNIRS data Click next to the source Displaying the raw fNIRS data Displaying the raw fNIRS data Right click on a channel will remove it from the display. Click again to return back. Left click on a channel will remove it from the analysis. Displaying the raw fNIRS data Select wavelength to display Zooming in Zoom in Zooming in Modifying the processing stream options 2 - Set hpf (high-pass filter) and lpf (low-pass filter) to 0, i.e. no filtering 1 - Open the processing options Running the processing stream hpf and lpf are set to 0 Zoom reset Select Run Intensity to ΔOD Select OD ΔOD to Hb concentrations Select Conc ΔOD to Hb concentrations Choose HbO/HbR/HbT to display. Use Control or Shift to show more than one. Band-pass filtering x-range fixed Showing HbO Band-pass filtering hpf = 0.00 lpf = 0.5 Select Run Band-pass filtering hpf = 0.00 lpf = 0.5 unchecked Band-pass filtering hpf = 0.01 lpf = 0.5 Select Run Band-pass filtering hpf = 0.1 lpf = 0.5 Select Run Go back to hpf = 0.01 and re-run hpf = 0.01 lpf = 0.5 Select Run This dataset doesn’t have stimulus onsets, we will enter them manually. Go to Tools > StimGUI