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TrajTracker Paradigms: Sample scripts
Changes beyond the basic configuration

This script demonstrates seveal things:

  • The per-trial data is provided in a CSV file (you can download it here). This file lets you specify the targets as well as several additional parameters per trial.

  • It shows how to change the experiment behaviour in a way that is not supported by the set of configuration parameters. Here, we wanted to set a fixed value onset time and duration for all targets. TrajTracker supports this via the per-trial CSV configuration file, but here - because these parameters do not change from trial to trial - we preferred specifying them only once. exp_info.text_target is the MultiTextBox object that presents text targets, so we configure it directly.

  • The experiment can work in stimulus-then-move mode (where the stimulus appears and only then you move the finger). To try this out, change the STIMULUS_THEN_MOVE variable to True.

import expyriment as xpy

 

import trajtracker as ttrk

import trajtrackerp as ttrkp

from trajtrackerp import num2pos, common

 

 

#-- Change this to True to switch into stimulus-then-move mode

STIMULUS_THEN_MOVE = False

 

if not xpy.misc.is_android_running():

    xpy.control.defaults.window_mode = True

    ttrk.log_to_console = True

 

ttrk.env.default_log_level = ttrk.log_info

 

 

accuracy_levels = [.05, .1]

 

config = num2pos.Config("Num2Pos(D+U)",

                        stimulus_then_move=STIMULUS_THEN_MOVE,

                        max_movement_time=2,

                        speed_guide_enabled=True,

                        max_numberline_value=100,

                        data_source="number_to_position_2.csv",  # Read targets from this CSV file

                        text_target_height=0.5,

 

                        fixation_type='cross',

 

                        post_response_target=True,         # After response was made, show the correct location

                        feedback_arrow_colors=[xpy.misc.constants.C_GREEN,

                                               xpy.misc.constants.C_EXPYRIMENT_ORANGE,

                                               xpy.misc.constants.C_RED],

                        feedback_accuracy_levels=accuracy_levels,

                        sound_by_accuracy=((accuracy_levels[0], 'feedback-accuracy-0.wav'),

                                           (accuracy_levels[1], 'feedback-accuracy-1.wav'),

                                           (1, 'feedback-accuracy-2.wav'))

                        )

 

if STIMULUS_THEN_MOVE:

    config.finger_moves_min_time = 0.6

    config.finger_moves_max_time = 1.5

 

#----------------------------------------------------------------

 

#-- Initialize & start the Expyriment

exp = ttrk.initialize()

xpy.control.start(exp)

 

if not xpy.misc.is_android_running():

    exp.mouse.show_cursor()

 

#-- Get subject info

(subj_id, subj_name) = ttrkp.common.get_subject_name_id()

 

 

#-- Initialize the experiment objects

 

exp_info = num2pos.ExperimentInfo(config, exp, subj_id, subj_name)

num2pos.create_experiment_objects(exp_info)

 

#-- Customize them

if STIMULUS_THEN_MOVE:

    exp_info.text_target.onset_time = [0.5, 0.6]

else:

    exp_info.text_target.onset_time = [0, 0.1]

exp_info.text_target.duration = [0.1, 2]

 

common.register_to_event_manager(exp_info)

 

#-- Run the experiment

num2pos.run_trials(exp_info)

 

#-- Shutdown Expyriment

xpy.control.end()

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