VizMars |
11-02-2016 08:12 AM |
Timing problem
Hi!
Please find attached a part of my code.
I use a EyeLink 1000 and so "el" stands for eyelink and represents the eyetracker object [el = pylink.EyeLink()]. The variable "ball" is a .osgb-file with a size of 25mb.
The function do_trial is called every trial in my experiment. I want the sound to be played 2 seconds after the ball appeared. But in the first trial of each block (and only in the first) the ball appears after the sound is played, otherwise it works just fine.
Does anybody know why this happens?
Code:
def el_rec_thread():
while True:
#check recording status
error = el.isRecording() # First check if recording is aborted
if error != 0:
end_el_trial()
return error
if inspect_over:
end_el_trial()
break
#check if break pressed
if(el.breakPressed()): # Checks for program termination or ALT-F4 or CTRL-C keys
end_el_trial()
return pl.ABORT_EXPT
def end_el_recording(participant_id, block_num, trial):
global inspect_over
sound.play()
optitrack.set_phase(POST_SOUND)
msg_end = "%s Block %d Trial %d Ende %d" % ( participant_id, block_num, trial, int(round(viz.tick()*1000)) )
el.sendMessage(msg_end)
inspect_over = True
def end_el_trial():
'''Ends recording: adds 100 msec of data to catch final events'''
pl.endRealTimeMode()
pl.pumpDelay(100)
el.stopRecording()
while el.getkey() :
pass
def do_trial(participant_id, block_num, trial, scale, distance):
global inspect_over
inspect_over = False
answer = -1 # set initial value to -1
#optitrack.set_block(block_num)
#optitrack.set_trial(trial)
#This supplies the title of the current trial at the bottom of the eyetracker display
msg_rec_status = "record_status_message 'Block %d, Trial %d/%d'" % (block_num, trial, N_TRIALS_EXC if (block_num == 0) else N_TRIALS_EXP)
el.sendCommand(msg_rec_status)
#defines the trial variables
#MUST be sent to the EyeLink data file PRIOR TO the Trial Start message ("TRIALID ...")
msg_trial_var = "TRIAL_VAR_LABELS %s %s %s" % ("Participant_ID", "Block_number", "Trial")
el.sendMessage(msg_trial_var)
#Always send a TRIALID message before starting to record.
#EyeLink Data Viewer defines the start of a trial by the TRIALID message.
#This message is different than the start of recording message START that is logged when the trial recording begins.
#The Data viewer will not parse any messages, events, or samples, that exist in the data file prior to this message.
msg_trial_id = "TRIALID %s Block %d Trial %d" % (participant_id, block_num, trial)
el.sendMessage(msg_trial_id)
# #Does drift correction and handles the re-do camera setup situations
# ###############################################################################
# drift_target.visible(viz.ON)
# yield viztask.waitFrame(1) #wait for the next frame to be drawn
# while True:
# #Checks whether we are still connected to the tracker
# if not el.isConnected():
# viztask.returnValue(pl.ABORT_EXPT)
# try:
# error = el.doDriftCorrect(MONITOR_WIDTH // 2, MONITOR_HEIGHT // 2, 0, 0)
# if error == 0:
# break # if drift correction OK go on
# except: # if re-calibration is necessary
# pl.openGraphics( (MONITOR_WIDTH, MONITOR_HEIGHT), 32 )
# el.doTrackerSetup()
# pl.closeGraphics()
# break
# drift_target.visible(viz.OFF)
# ###############################################################################
#switch tracker to ide and give it time to complete mode switch
el.setOfflineMode()
pl.msecDelay(50)
#send trial variable data sometime in BETWEEN the TRIALID and TRIAL_RESULT messages
msg_trial_data = "!V TRIAL_VAR_DATA %s %d %d" % (participant_id, block_num, trial)
el.sendMessage(msg_trial_data)
##start recording samples and events to edf file and over the link.
#error = el.startRecording(1, 1, 1, 1)
#start recording samples and events to edf file
error = el.startRecording(1, 1, 0, 0)
if(error != 0): viztask.returnValue(error)
#disable python garbage collection to avoid delays
gc.disable()
#begin the realtime mode
pl.beginRealTimeMode(100)
eye_used = el.eyeAvailable() #determine which eye(s) are available
if eye_used == BINOCULAR:
el.sendMessage("EYE_USED: 2 BOTH")
else:
print ("Error, not both eyes used!")
viztask.returnValue(pl.TRIAL_ERROR)
ball.setPosition( [0, 0, -distance] )
ball.setScale( [scale]*3 )
#determine trial start time
startTime = viz.tick()
ball.visible(viz.ON)
#determine delay of the actual stimulus onset
drawTime = int( round((viz.tick() - startTime) * 1000) )
msg_start = "%s Block %d Trial %d Start %d" % ( participant_id, block_num, trial, int(round(viz.tick()*1000)) )
el.sendMessage(msg_start)
el.sendMessage("SYNCTIME %d" %drawTime)
#reset keys and buttons on tracker
el.flushKeybuttons(0)
vizact.ontimer2(2, 0, end_el_recording, participant_id, block_num, trial) # repeats = Number of times to repeat the timer. If 0, the timer will be called only once
rec_data = yield viztask.waitDirector(el_rec_thread)
if rec_data.returnValue != None: # if not trial-over-case
viztask.returnValue(rec_data.returnValue)
#the call to the getRecordingStatus() method makes sure that
#no Abort menu operations remain to be performed, and generates the trial return code
ret_value = el.getRecordingStatus()
pl.endRealTimeMode()
###### etc ...
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