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44 lines
2.8 KiB
Markdown
44 lines
2.8 KiB
Markdown
# jspsych-image-slider-response
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This plugin displays an image.The stimulus can be displayed until a response is given, or for a pre-determined amount of time. The trial can be ended automatically if the subject has failed to respond within a fixed length of time.
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## Parameters
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This table lists the parameters associated with this plugin. Parameters with a default value of *undefined* must be specified. Other parameters can be left unspecified if the default value is acceptable.
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Parameter | Type | Default Value | Description
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----------|------|---------------|------------
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stimulus | string | *undefined* | The path to the image file to be displayed.
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labels | array of keycodes/strings | Labels of the slider
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button_label | String | 'Continue' | Label of the button to advance/submit
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min | integer | 0 | Sets the minimum value of the slider
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max | integer | 100 | Sets the maximum value of the slider
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step | integer | 1 | Sets the step of the slider
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prompt | String | '' | 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).
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stimulus_duration | integer | -1 | How long to show the stimulus for in milliseconds. If the value is -1, then the stimulus will be shown until the subject makes a response.
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trial duration | numeric | -1 | How long to wait for the subject to make a response before ending the trial in milliseconds. If the subject fails to make a response before this timer is reached, the the subject's response will be recorded as -1 for the trial and the trial will end. If the value of this parameter is -1, then the trial will wait for a response indefinitely.
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response_ends_trial | boolean | true | If true, then the trial will end whenever the subject makes a response (assuming they make their response before the cutoff specified by the `timing_response` parameter). If false, then the trial will continue until the value for `trial_duration` is reached. You can use this parameter to force the subject to view a stimulus for a fixed amount of time, even if they respond before the time is complete.
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## Data Generated
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In addition to the [default data collected by all plugins](overview#datacollectedbyplugins), this plugin collects the following data for each trial.
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Name | Type | Value
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-----|------|------
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response | numeric | The numeric value of the slider.
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rt | numeric | The 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.
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## Examples
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#### Displaying trial until subject gives a response
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```javascript
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var trial = {
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type: 'image-slider-response',
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stimulus: 'img/happy_face_1.png',
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labels: ['happy', 'sad'],
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prompt: "<p>How happy/sad is this person?</p>",
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response_ends_trial: false
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};
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```
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