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    "PsychoPy PLR\n",
    "============\n",
    "\n",
    "If you decide that a standard computer monitor is sufficient for presenting a light stimulus, you could use *PyPlr* with PsychoPy. This minimal example presentes a 1-second white flash on a monitor and saves a recording with an annotation marking the onset of the flash. Just make sure the participant's head is stabelised and that the Pupil Core world camera can see the screen."
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    "```Python\n",
    "#!/usr/bin/env python3\n",
    "# -*- coding: utf-8 -*-\n",
    "\n",
    "import sys\n",
    "from time import sleep\n",
    "\n",
    "from psychopy import core, visual\n",
    "\n",
    "from pyplr.pupil import PupilCore\n",
    "\n",
    "def main(subject='test', display_size=(1024,768)):   \n",
    "     \n",
    "    # Set up Pupil Core\n",
    "    p = PupilCore()\n",
    "    \n",
    "    # Setup windows and stimulus\n",
    "    win = visual.Window(size=display_size, screen=1, color='black')\n",
    "    white = visual.Rect(win, units='pix', size=display_size)\n",
    "    white.color='white'\n",
    "    black = visual.Rect(win, units='pix', size=display_size)\n",
    "    black.color='black'\n",
    "    \n",
    "    # Set up pupil trigger\n",
    "    annotation = p.new_annotation('LIGHT_ON')\n",
    "     \n",
    "    # Start recording\n",
    "    p.command('R {}'.format(subject))\n",
    "    sleep(2.)\n",
    "        \n",
    "    # Start light_stamper\n",
    "    lst_future = p.light_stamper(annotation, threshold=15, timeout=6.)\n",
    "    \n",
    "    # Baseline\n",
    "    sleep(2.)\n",
    "    \n",
    "    # Present stimulus\n",
    "    white.draw()\n",
    "    win.flip()\n",
    "    core.wait(1.0)\n",
    "    black.draw()\n",
    "    win.flip()\n",
    "    core.wait(6.0)\n",
    "        \n",
    "    # Close the window\n",
    "    win.close()\n",
    "     \n",
    "    # Close PsychoPy\n",
    "    core.quit()\n",
    "                 \n",
    "if __name__ == '__main__':    \n",
    "    try:\n",
    "        main()\n",
    "    except KeyboardInterrupt:\n",
    "        print('Killed by user')\n",
    "        sys.exit(0)\n",
    "```  "
   ]
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   "metadata": {},
   "source": [
    "Check out the PLR STLAB example for ideas on how to make an automated pupillometer with *PyPlr* and PsychoPy. Also, try comparing pupil responses to the red and blue channels of your monitor. You might just see a PIPR..."
   ]
  }
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