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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
A simple behavioural task to asses a Simon effect.
See also:
http://en.wikipedia.org/wiki/Simon_effect
"""
from expyriment import design, control, stimuli, io, misc
# Create and initialize an Experiment
exp = design.Experiment("Simon Task")
control.initialize(exp)
# Define and preload standard stimuli
fixcross = stimuli.FixCross()
fixcross.preload()
# Create IO
#response_device = io.EventButtonBox(io.SerialPort("/dev/ttyS1"))
response_device = exp.keyboard
# Create design
for task in ["left key for green", "left key for red"]:
b = design.Block()
b.set_factor("Response", task)
for where in [["left", -300], ["right", 300]]:
for what in [["red", misc.constants.C_RED],
["green", misc.constants.C_GREEN]]:
t = design.Trial()
t.set_factor("Position", where[0])
t.set_factor("Colour", what[0])
s = stimuli.Rectangle([50, 50], position=[where[1], 0],
colour=what[1])
t.add_stimulus(s)
b.add_trial(t, copies=20)
b.shuffle_trials()
exp.add_block(b)
exp.add_bws_factor("ResponseMapping", [1, 2])
exp.data_variable_names = ["Position", "Button", "RT"]
# Start Experiment
control.start()
exp.permute_blocks(misc.constants.P_BALANCED_LATIN_SQUARE)
for block in exp.blocks:
stimuli.TextScreen("Instructions", block.get_factor("Response")).present()
response_device.wait()
for trial in block.trials:
fixcross.present()
exp.clock.wait(1000 - trial.stimuli[0].preload())
trial.stimuli[0].present()
button, rt = response_device.wait()
exp.data.add([trial.get_factor("Position"), button, rt])
# End Experiment
control.end()
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