# The participant app experience

So you can picture what your configuration produces, this chapter describes what
participants see in the app. Everything here is driven by the choices you make in the
portal.

## Screening and consent

New participants first complete the **eligibility screening** questionnaire. If they are
eligible, they are shown the **participant information sheet** and the **consent form**
(from {doc}`setup/7-compliance`) and must agree before continuing.

## Baseline

Before treatment starts, participants complete the **before-treatment** questionnaires
you selected in {doc}`setup/2-assessments` (for example THI, TFI, IHS).

## Listening sessions

During an intervention period the app runs the participant's **daily listening plan**
(from {doc}`setup/5-sessions`):

- Before a session they give their **before-session ratings**.
- They listen to their assigned sound; the app tracks recorded listening time and
  requires the minimum before they can finish.
- After a session they give their **after-session ratings**.
- The app guides them toward the daily target and, unless you allow listening beyond it,
  stops them once they reach it.

## Washout

During a washout the experience depends on the washout type:

- **Washout (nothing)**: no listening; the app tells the participant there is no session
  in this phase. They still answer the daily questionnaire.
- **Washout (unmodulated)**: the participant still listens, but to a plain, unmodulated
  sound, with the usual before/after questionnaires.

## Daily check-ins

Where you have configured an **every day** questionnaire, participants answer it once per
day.

## Final questionnaire and debrief

After the last phase, participants complete the **final questionnaire**. Submitting it
completes their participation. They can then see their **debrief**.