A background audio response allows researchers to record any sounds captured by participants’ microphone during a trial, without any interactions required from participants. This is a background response, meaning that it is invisible to participants (unless the volume_visualizer property is to true).
This feature works most reliably in Chrome and Firefox.
Please clearly communicate to your participants that they are being recorded on relevant trials.
type must be specified as "background_audio".{
"type": "background_audio"
}
1.5)0{
"type": "background_audio",
"duration": 1.5
}
In this code, the background audio response stops collecting data after 1500 milliseconds.
true, the audio response will record the time (in milliseconds) at which the participant first starts speaking (or making a loud noise).true or falsefalseonset_sensitivity{
"type": "background_audio",
"onset_detection": true
}
1 and 99, with 1 being the least sensitive and 99 being the most sensitive.50onset_detection{
"type": "background_audio",
"onset_detection": true,
"onset_sensitivity": 60
}
Given a response named "bgaud1" defined as follows:
{
"type": "background_audio",
"onset_detection": true,
"volume_visualizer": true,
"duration": 1.3
}
We can define a child response "bgaud2" that has its own duration property but is identical otherwise.
{
"type": "background_audio",
"parent": "bgaud1",
"duration": 2.5
}
Available since August 15, 2022
true or falsefalsetrue, it automatically sets onset_detection to true as well and cannot be changed.{
"type": "audio",
"stop_on_silence": true
}
Available since August 15, 2022
true or falsefalsetrue, it automatically sets onset_detection to true as well and cannot be changed.{
"type": "audio",
"trim_leading_silence": true
}
true or falsefalse (i.e., not displaying the visualizer)false, it is highly recommended that you inform participants that they are being recorded{
"type": "background_audio",
"volume_visualizer": true
}
onset_detection is turned on; empty otherwise