> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/emotivpro-builder/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/emotivpro-builder/building-an-experiment-in-builder/stimuli-phases.md).

# Stimuli phases

A stimuli phase allows you to manipulate your chosen elements to your own specification — e.g. adding loops, timings, intervals, etc. 

#### How do I add elements to a stimuli phase?

To add an element to a stimuli phase, click on the + button on the stimuli phase screen. When you click on the + button, a drop-down list will appear where you can choose one of the following elements to add to the phase:

* **Text** — Type and edit text that you want to include in the phase. You can also embed a URL or images in the text element.

![](https://lh3.googleusercontent.com/UnCa9dlLzx4BhzFi34ozBbB6iiyM2kLP1KMPzDRECHEz2tELADqSXhXxDmAdjnyie7p7TjZ4cXlv4TINq4L12mdbxdOXbaDjhz1U7hhFW7814J85acBFduEuPQjKOUjM_KHwH5Su)

* **Image** — Upload an image file or select a previously uploaded image that you want to include in the phase.  
* **Audio** — Upload an audio file or select a previously uploaded audio file that you want to include in the phase. 
* **Video** — Upload an audio file or select a previously uploaded audio file that you want to include in the phase. 
* **Questionnaire** — Type questions, select the type of questions (multiple choice, open text, etc.), input answers and choose how they are displayed in the phase. 

#### Customizing a stimuli phase

Once you’ve added an element to your stimuli phase, you can customize it. The following customizations are available:

* Intervals (ISI)
* Stimulus
* Loops
* Randomizations
* Feedback and response
* Audio overlay/soundtracks

To customize an element in a stimuli phase, click on the **Settings** button. A menu will appear where you can select suitable ways to customize your stimuli phase.


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