Changing the degrees of amplitude and Hertz of vibrating stimuli

[Zelal_Gulbahce]

Is there a function or code to specify the amplitude and hertz of vibrating stimuli?

The task will run on tablets

E.g., two pairs of stimuli are presented. Participants are asked to place their left and right fingers on each image and need to decide which of the two images vibrated more. Each time a participant responds correctly, the vibration amplitude of stimuli increases by 2 amps.

Thank you

[Chen]

Hey,
Did you try this method?

How to add vibrations to an experiment

Hi There, You can present vibrating in your task by adding a code component, change the “code Type” to JS and then adding this in the Begin Routine tab (if you do indeed want the vibration to happen at the start of the routine): navigator.vibrate(1000); where “1000” is the duration of the fibration in ms - for more details on what you can add into the navigator vibrate see here. Note that this will not work on devices that do not have a vibrate feature available. So, to avoid an error, I sug…

[Zelal_Gulbahce]

Hi,

Yes, thank you for the suggestion. But this only specifies the duration of the vibrations.

[Chen]

Hey,
You can use the vibration API:

Vibration API - Web APIs | MDN

It will give you the option to change the duration and patterns. I don’t think it’s possible to control the amplitude/intensity of the vibration. Maybe there are some tricks with Java, but I don’t see a method controlling it with Javascript (assuming you are using the tablet vibrations and not another device).

You can read about vibration intensity and its problems here:

controlling vibration intensity in android phones? is it possible?

And here:

How can I control the amplitude/strength of vibration with the web Vibration API?