View difference between Paste ID: u473t6Li and 23pTuDdS

 import random
 from openexp.keyboard import keyboard
 
 # Inter-stimulus interval
 ITI = 20
 
 # The number of cycles
 n_cycles = 20
 
 # Determines whether the canvas list is presented in random order
 # or sequentially
 random_order = False
 
-# Set-up a keyboard object with a timeout equal to the interval
+# Set-up a keyboard object with a very brief timeout so that we can
-# between the two stimuli
+# poll the keyboard continuously
 my_keyboard = keyboard(exp, timeout=1)
 
 # Copy a number of canvases from sketchpads and put them in a list
 canvas_list = [
 	self.copy_sketchpad('sketchpad_1'),
 	self.copy_sketchpad('sketchpad_2'),
 	self.copy_sketchpad('sketchpad_3')
 	]
 
 # Start the response interval
 start_timestamp = self.time()
 
 # We are going to keep a list of responses
 resp_list = []
 
 # Go into a loop where the two canvases are shown in alternation
 for i in range(n_cycles):
 
 	# Show the first canvas
 	if random_order:
 		my_canvas = random.choice(canvas_list)
 	else:
 		my_canvas = canvas_list[i % len(canvas_list)]
 
 	# Show the canvas
 	t1 = my_canvas.show()
 
-	# Use the get_key() function to sleep and monitor for keypresses
+	# Get in a loop that sleeps for the ITI period and polls for
-	# at the same time.
+	# keypresses at the same time.
 	while self.time() - t1 < ITI:
 		resp, t2 = my_keyboard.get_key()
 		if resp != None:
 			# If a key was pressed, add it to the list of responses.
 			resp_list.append( (resp, t2) )
 
 # If the response_list is empty, no response was given
 if len(resp_list) == 0:
 	response = 'timeout'
 	response_time = 0
 
 # Otherwise get the first response from the list
 else:
 	resp, resp_timestamp = resp_list[0]
 	response = resp
 	response_time = start_timestamp - resp_timestamp
 
 # Set the response variables!
 exp.set('response', resp)
 exp.set('response_time', response_time)
 
 # To maintain feedback variables, see
 # <http://osdoc.cogsci.nl/usage/giving-feedback-to-participants/#inline-script>