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31 lines
1.4 KiB
Markdown
31 lines
1.4 KiB
Markdown
# jspsych-webgazer-init-camera
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This plugin initializes the camera and helps the participant center their face in the camera view for using the the [WebGazer extension](/extensions/jspsych-ext-webgazer). For a narrative description of eye tracking with jsPsych, see the [eye tracking overview](/overview/eye-tracking).
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## Parameters
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In addition to the [parameters available in all plugins](/overview/plugins#parameters-available-in-all-plugins), this plugin accepts the following parameters. 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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instructions | string | too long to put here | Instructions for the participant to follow.
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button_text | string | Continue | The text for the button that participants click to end the trial.
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## Data Generated
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In addition to the [default data collected by all plugins](/overview/plugins#data-collected-by-all-plugins), this plugin collects the following data for each trial.
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Name | Type | Value
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-----|------|------
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load_time | numeric | The time it took for webgazer to initialize. This can be a long time in some situations, so this value is recorded for troubleshooting when participants are reporting difficulty.
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## Example
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#### Parameterless use
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```javascript
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var init_camera = {
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type: 'webgazer-init-camera'
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}
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```
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