jspsych-categorize-animation

The categorize animation plugin shows a sequence of images at a specified frame rate. The subject responds by pressing a key. Feedback indicating the correctness of the response is given.

Parameters

Parameters with a default value of undefined must be specified. Other parameters can be left unspecified if the default value is acceptable.

Parameter	Type	Default Value	Description
stimuli	array	undefined	Each element of the array is a path to an image file.
choices	array of keycodes	`jsPsych.ALL_KEYS`	This array contains the keys that the subject is allowed to press in order to respond to the stimulus. Keys can be specified as their numeric key code or as characters (e.g., `'a'`, `'q'`). The default value of `jsPsych.ALL_KEYS` means that all keys will be accepted as valid responses. Specifying `jsPsych.NO_KEYS` will mean that no responses are allowed.
key_answer	numeric	undefined	A numeric key code indicating the correct response.
text_answer	string	""	A text label that describes the correct answer. Used in conjunction with the `correct_text` and `incorrect_text` parameters.
correct_text	string	"Correct."	String to show when the correct answer is given. Can contain HTML formatting. The special string `%ANS%` can be used within the string. If present, the plugin will put the `text_answer` for the trial in place of the %ANS% string (see example below).
incorrect_text	string	"Wrong."	String to show when the wrong answer is given. Can contain HTML formatting. The special string `%ANS%` can be used within the string. If present, the plugin will put the `text_answer` for the trial in place of the %ANS% string (see example below).
frame_time	numeric	500	How long to display each image (in milliseconds).
sequence_reps	numeric	1	How many times to show the entire sequence.
allow_response_before_complete	boolean	false	If true, the subject can respond before the animation sequence finishes.
prompt	string	null	This string can contain HTML markup. Any content here will be displayed below the stimulus. The intention is that it can be used to provide a reminder about the action the subject is supposed to take (e.g., which key to press).
feedback_duration	numeric	2000	How long to show the feedback (milliseconds).

Data Generated

In addition to the default data collected by all plugins, this plugin collects the following data for each trial.

Name	Type	Value
stimulus	JSON	JSON encoded representation of the array of stimuli displayed in the trial.
key_press	numeric	Indicates which key the subject pressed. The value is the numeric key code corresponding to the subject's response.
rt	numeric	The response time in milliseconds for the subject to make a response. The time is measured from when the stimulus first appears on the screen until the subject's response.
correct	boolean	`true` if the subject got the correct answer, `false` otherwise.

Examples

Basic example

var animation_trial = {
  type: 'categorize-animation',
  stimuli: ["img/face_3.jpg", "img/face_2.jpg", "img/face_4.jpg", "img/face_1.jpg"],
	choices: [80, 81], // 80 = 'p', 81 = 'q'
	key_answer: 81, // correct answer is 'q' for both trials
};

Giving feedback with `%ANS%` string

var animation_trial = {
  type: 'categorize-animation',
  stimuli: ["img/face_3.jpg", "img/face_2.jpg", "img/face_4.jpg", "img/face_1.jpg"],
  choices: [80, 81], // 80 = 'p', 81 = 'q'
  key_answer: 81, // correct answer is 'q' for both trials
	text_answer: 'Dax', // the label for the sequence is 'Dax'
	correct_text: 'Correct! This was a %ANS%.',
	incorrect_text: 'Incorrect. This was a %ANS%.'
};

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