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"""
==============================================
Real-time feedback for decoding :: Client Side
==============================================
This example demonstrates how to setup a real-time feedback
mechanism using StimServer and StimClient.
The idea here is to display future stimuli for the class which
is predicted less accurately. This allows on-demand adaptation
of the stimuli depending on the needs of the classifier.
To run this example, open ipython in two separate terminals.
In the first, run rt_feedback_server.py and then wait for the
message
RtServer: Start
Once that appears, run rt_feedback_client.py in the other terminal
and the feedback script should start.
All brain responses are simulated from a fiff file to make it easy
to test. However, it should be possible to adapt this script
for a real experiment.
"""
print(__doc__)
# Author: Mainak Jas <mainak@neuro.hut.fi>
#
# License: BSD (3-clause)
from mne.realtime import StimClient
from psychopy import visual, core
# Instantiating stimulation client
# Port number must match port number used to instantiate
# StimServer. Any port number above 1000 should be fine
# because they do not require root permission.
stim_client = StimClient('localhost', port=4218)
# create a window
mywin = visual.Window([800, 600], monitor="testMonitor", units="deg")
# create the stimuli
# right checkerboard stimuli
right_cb = visual.RadialStim(mywin, tex='sqrXsqr', color=1, size=5,
visibleWedge=[0, 180], radialCycles=4,
angularCycles=8, interpolate=False,
autoLog=False)
# left checkerboard stimuli
left_cb = visual.RadialStim(mywin, tex='sqrXsqr', color=1, size=5,
visibleWedge=[180, 360], radialCycles=4,
angularCycles=8, interpolate=False,
autoLog=False)
# fixation dot
fixation = visual.PatchStim(mywin, color=-1, colorSpace='rgb', tex=None,
mask='circle', size=0.2)
# the most accurate method is using frame refresh periods
# however, since the actual refresh rate is not known
# we use the Clock
timer1 = core.Clock()
timer2 = core.Clock()
ev_list = list() # list of events displayed
# start with right checkerboard stimuli. This is required
# because the ev_list.append(ev_list[-1]) will not work
# if ev_list is empty.
trig = 4
# iterating over 50 epochs
for ii in range(50):
if trig is not None:
ev_list.append(trig) # use the last trigger received
else:
ev_list.append(ev_list[-1]) # use the last stimuli
# draw left or right checkerboard according to ev_list
if ev_list[ii] == 3:
left_cb.draw()
else:
right_cb.draw()
fixation.draw() # draw fixation
mywin.flip() # show the stimuli
timer1.reset() # reset timer
timer1.add(0.75) # display stimuli for 0.75 sec
# return within 0.2 seconds (< 0.75 seconds) to ensure good timing
trig = stim_client.get_trigger(timeout=0.2)
# wait till 0.75 sec elapses
while timer1.getTime() < 0:
pass
fixation.draw() # draw fixation
mywin.flip() # show fixation dot
timer2.reset() # reset timer
timer2.add(0.25) # display stimuli for 0.25 sec
# display fixation cross for 0.25 seconds
while timer2.getTime() < 0:
pass
mywin.close() # close the window
core.quit()
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