Implement a stop-signal delay in the stop-signal task

Comments

• knmeyer

  November 2018

  Hi Frederic,

  It looks like you're using not the response to the stop signal, but what you specify in the loop initially. Right now, those are entirely colinear, such that every time you specify correct_response = None, also stop_signal = A. This means that when you specify "if var.correct_response = None and var.stop_signal = " "" that never happens. My understanding would be that for a stop signal task, you would want to decrease the duration (SSD) when they appropriately stopped themselves and increase the duration if they were supposed to stop and then they did not. Let me know if I'm misunderstanding. Based on that, though, the code below should work:

  #when participants should stop (i.e. stop trial), and they do stop (i.e. no response), decrease SSD.
  if var.correct_response == None and var.SSD > 99 and var.response == None:
          var.SSD -= 50
  #when participants should stop, and they do NOT stop (any response), increase SSD.
  if var.correct_response == None and var.response != None:
          var.SSD += 50
  

  Best,
  Kristin