', {
+ "class": 'jspsych-xab-stimulus left',
+ html: images[0]
+ }));
+ display_element.append($('
', {
+ "class": 'jspsych-xab-stimulus right',
+ html: images[1]
+ }));
+ }
+
+ if (trial.prompt !== "") {
+ display_element.append(trial.prompt);
+ }
+
+ // if timing_ab is > 0, then we hide the stimuli after timing_ab milliseconds
+ if (trial.timing_ab > 0) {
+ setTimeout(function() {
+ if (!xab_trial_complete) {
+ $('.jspsych-xab-stimulus').css('visibility', 'hidden');
}
- trials[i].left_key = params.left_key || 81; // defaults to 'q'
- trials[i].right_key = params.right_key || 80; // defaults to 'p'
- // timing parameters
- trials[i].timing_x = params.timing_x || 1000; // defaults to 1000msec.
- trials[i].timing_xab_gap = params.timing_xab_gap || 1000; // defaults to 1000msec.
- trials[i].timing_ab = params.timing_ab || -1; // defaults to -1, meaning infinite time on AB. If a positive number is used, then AB will only be displayed for that length.
- // optional parameters
- trials[i].is_html = (typeof params.is_html === 'undefined') ? false : params.is_html;
- trials[i].prompt = (typeof params.prompt === 'undefined') ? "" : params.prompt;
+ }, trial.timing_ab);
+ }
+ // create the function that triggers when a key is pressed.
+ var after_response = function(info) {
+
+ var correct = false; // true when the correct response is chosen
+
+ if (info.key == trial.left_key) // 'q' key by default
+ {
+ if (target_left) {
+ correct = true;
+ }
+ } else if (info.key == trial.right_key) // 'p' key by default
+ {
+ if (!target_left) {
+ correct = true;
+ }
}
- return trials;
+
+
+ // create object to store data from trial
+ var trial_data = {
+ "rt": info.rt,
+ "correct": correct,
+ "stimulus_x": trial.x_path,
+ "stimulus_a": trial.a_path,
+ "stimulus_b": trial.b_path,
+ "key_press": info.key
+ };
+ jsPsych.data.write($.extend({}, trial_data, trial.data));
+
+ display_element.html(''); // remove all
+
+ xab_trial_complete = true;
+
+ // move on to the next trial after timing_post_trial milliseconds
+ if (trial.timing_post_trial > 0) {
+ setTimeout(function() {
+ jsPsych.finishTrial();
+ }, trial.timing_post_trial);
+ } else {
+ jsPsych.finishTrial();
+ }
+
};
- var xab_trial_complete = false;
+ jsPsych.pluginAPI.getKeyboardResponse(after_response, [trial.left_key, trial.right_key], 'date', false);
- plugin.trial = function(display_element, trial) {
-
- // if any trial variables are functions
- // this evaluates the function and replaces
- // it with the output of the function
- trial = jsPsych.pluginAPI.normalizeTrialVariables(trial);
-
-
- xab_trial_complete = false;
-
- // how we display the content depends on whether the content is
- // HTML code or an image path.
- if (!trial.is_html) {
- display_element.append($('![]()
', {
- src: trial.x_path,
- "class": 'jspsych-xab-stimulus'
- }));
- } else {
- display_element.append($('
', {
- "class": 'jspsych-xab-stimulus',
- html: trial.x_path
- }));
- }
-
- // start a timer of length trial.timing_x to move to the next part of the trial
- setTimeout(function() {
- showBlankScreen();
- }, trial.timing_x);
- break;
-
- // the second part of the trial is the gap between X and AB.
-
- function showBlankScreen() {
- // remove the x stimulus
- $('.jspsych-xab-stimulus').remove();
-
- // start timer
- setTimeout(function() {
- showSecondStimulus();
- }, trial.timing_xab_gap);
- }
-
- // the third part of the trial is to display A and B, and get the subject's response
-
- function showSecondStimulus() {
-
- // randomize whether the target is on the left or the right
- var images = [trial.a_path, trial.b_path];
- var target_left = (Math.floor(Math.random() * 2) === 0); // 50% chance target is on left.
- if (!target_left) {
- images = [trial.b_path, trial.a_path];
- }
-
- // show the options
- if (!trial.is_html) {
- display_element.append($('![]()
', {
- "src": images[0],
- "class": 'jspsych-xab-stimulus left'
- }));
- display_element.append($('![]()
', {
- "src": images[1],
- "class": 'jspsych-xab-stimulus right'
- }));
- } else {
- display_element.append($('
', {
- "class": 'jspsych-xab-stimulus left',
- html: images[0]
- }));
- display_element.append($('
', {
- "class": 'jspsych-xab-stimulus right',
- html: images[1]
- }));
- }
-
- if (trial.prompt !== "") {
- display_element.append(trial.prompt);
- }
-
- // if timing_ab is > 0, then we hide the stimuli after timing_ab milliseconds
- if (trial.timing_ab > 0) {
- setTimeout(function() {
- if (!xab_trial_complete) {
- $('.jspsych-xab-stimulus').css('visibility', 'hidden');
- }
- }, trial.timing_ab);
- }
-
- // create the function that triggers when a key is pressed.
- var after_response = function(info) {
-
- var correct = false; // true when the correct response is chosen
-
- if (info.key == trial.left_key) // 'q' key by default
- {
- if (target_left) {
- correct = true;
- }
- } else if (info.key == trial.right_key) // 'p' key by default
- {
- if (!target_left) {
- correct = true;
- }
- }
-
-
- // create object to store data from trial
- var trial_data = {
- "rt": info.rt,
- "correct": correct,
- "stimulus_x": trial.x_path,
- "stimulus_a": trial.a_path,
- "stimulus_b": trial.b_path,
- "key_press": info.key
- };
- jsPsych.data.write($.extend({}, trial_data, trial.data));
-
- display_element.html(''); // remove all
-
- xab_trial_complete = true;
-
- // move on to the next trial after timing_post_trial milliseconds
- if (trial.timing_post_trial > 0) {
- setTimeout(function() {
- jsPsych.finishTrial();
- }, trial.timing_post_trial);
- } else {
- jsPsych.finishTrial();
- }
-
- };
-
- jsPsych.pluginAPI.getKeyboardResponse(after_response, [trial.left_key, trial.right_key], 'date', false);
-
- }
- }
- };
-
- return plugin;
- })();
+ }
+ };
+
+ return plugin;
+ })();
})(jQuery);