Setup an experiment and save data

Comments

• eduard

  January 2017

  1.How can I add video file or image to the experiment , I have added using sketchpad , but for video how to make it as long as the video plays ?

  Yes, with sketchpads you can add images. And with the video plugin, you can present videos. Unless you specify something else, the video will run as long as its duration.

  2.After the video file is finished , how the experiment should end and save the data ?

  Nothing needs to be done. The experiment will stop once no further items needs to be executed. For the data to be written to file you need to add a loggeritem to the experimental sequence. Then every time this logger item is executed, the current trials will be written to the file.

  When eye-tracking, the eyetracker software usually writes a seperate logfile with all the eye position samples. You can either opt for combining these two files after you recorded the data. Or you can send Opensesame variables to the eyetracker and it will be added to the eye logfile right away (at least it does so with the Eyelink eyetrackers)

  Eduard

  
• sarmad.m

  February 2017 edited February 2017

  Hi, I i'm using this code below to recored data from eyetribe using pygaze .

  when I run the .bat file it just shows ( press space to start calibration ) when I press space just shows a

  white calibration dot and stops the program . what could be the problem ?

  import os
  from constants import *
  from pygaze.display import Display
  from pygaze.screen import Screen
  from pygaze.keyboard import Keyboard
  from pygaze.eyetracker import EyeTracker
  import pygaze.libtime as timer
  
   # Initialise a Display to interact with the monitor
   disp = Display()
  
  # Initialise a Keyboard to collect key presses
  kb = Keyboard(keylist=None, timeout=None)
  
  # Create a Screen for the image task instructions
  inscr = Screen()
  inscr.draw_text(text='Please look at the images. \
  \n\n(Press any key to begin)', fontsize=24)
  
   # Create a Screen with a central fixation cross
   fixscr = Screen()
   fixscr.draw_fixation(fixtype='cross', diameter=8)
  
  # Create a Screen to draw images on later
   imgscr = Screen()
  
  # Initialise a new EyeTracker
   tracker = EyeTracker(disp)
  
  # Calibrate the eye tracker
  tracker.calibrate()
  
  # Feed the instructions to the Display
  disp.fill(inscr)
  # Show the instructions
  disp.show()
  # Wait until the participant presses any key
  # (Allowing them to read the instructions at their own pace)
  kb.get_key()
  
  # Loop through all image names
  for imgname in IMGNAMES:
  
  # Construct the path to the image
  imgpath = os.path.join(IMGDIR, imgname)
  
  # Draw the image on imgscr
  # (clear imgscr first, to be sure it's clean)
  imgscr.clear()
  imgscr.draw_image(imgpath)
  
  # Start recording gaze data
  tracker.start_recording()
  
  # Display a status message on the EyeLink computer
  # (EyeLink only; doesn't do anything for other brands)
  tracker.status_msg('Trial with %s image' % (imgname))
  
  # Log trial start
  tracker.log('TRIALSTART')
  
  # Feed the fixation Screen to the Display
  disp.fill(fixscr)
  # Update the monitor to show the fixation mark
  disp.show()
  # Log the fixation onset to the gaze data file
  tracker.log('fixation_onset')
  # Wait for the right duration
  timer.pause(FIXTIME)
  
  # Feed the image Screen to the Display
  disp.fill(imgscr)
  # Update the monitor to show the image
  disp.show()
  # Log the image onset to the gaze data file
  # Include the image name in the message!
  tracker.log('image_onset, imgname=%s' % (imgname))
  # Wait for the right duration
  timer.pause(IMGTIME)
  
  # Clear the Display
  disp.fill()
  # Update the monitor to show a blank screen
  disp.show()
  # Log the image offset
  tracker.log('image_offset')
  
  # Log the end of the trial
  tracker.log('TRIALEND')
  # Pause recording
  tracker.stop_recording()
  
  # Clear the instructions Screen
  inscr.clear()
  # Write a new message
  inscr.draw_text(text='All done!', fontsize=24)
  # Feed the new message to the Display
  disp.fill(inscr)
  # Show the message
  disp.show()
  # Wait until the participant presses any key
  # (Allowing them to read at their own pace)
  kb.get_key()
  
  # Close the connection to the eye tracker
  # (This will also close the log file!)
  tracker.close()
  
  # Close the Display
  disp.close()
  
• eduard

  February 2017

  Hi,

  I'm not sure why but your line, kb.get_key(), is not responding to key presses. For testing purposes, try using a timeout (e.g. 2000 ms), this solved it for me. However, on the long run, you should find out how to initialize a keyboard the proper way. I don't use the pygaze functions myself, so I can't really help there.

  So, use this to check if your experimental sequence is alright: kb.get_key(timeout=2000)

  Eduard