UNCOVER terminated early based on low enrollment and lack of device data collected making analysis unfeasible.

The objective of this study is to collect both active and passive data using a wearable, multi-sensor device (Verily Study Watch) and phone application (Mood App) which aims to capture mental health status, in subjects participating in the RECOVER clinical trial (A Prospective, Multi-center, Randomized Controlled Blinded Trial Demonstrating the Safety and Effectiveness of VNS Therapy® System as Adjunctive Therapy Versus a No Stimulation Control in Subjects With Treatment-Resistant Depression).

A prospective, observational, exploratory study collecting passive and active behavioral, environmental and physiological data, via the use of an Android smartphone application and Study Watch.

This sub-study is only open to sites participating in the RECOVER clinical study.

All subjects participating in the RECOVER clinical trial at active UNCOVER sites will be offered participation in this sub-study.

Subjects who opt-in to the Mood App portion of the sub-study will be followed for a minimum of 12 months and a maximum of 60 months for the Mood App portion of the sub-study.

Subjects who opt-in to the use of the Study Watch portion of the sub-study will be followed for a minimum of 12 months and maximum of 24 months for the Study Watch portion of the sub-study.

Inclusion Criteria:

All Subjects

1. Current consented subject in the RECOVER clinical trial;
2. Adult (i.e. ≥ 18 years of age, unless a resident of any U.S. state where the age of majority is 19, in which case must be ≥ 19 years of age);
3. Able and willing to provide written informed consent for this sub-study;
4. Able and willing to comply with all study procedures;
5. Able to read and speak English.

Phone Application

1. Have a personal Google user account or be willing to create and own a personal Google user account;
2. Owns a personal Android smartphone with a data plan and is the sole user of that smartphone;
3. Agrees to download and maintain the phone application onto personal Android smartphone for the duration of the sub-study;

Study Watch

1. Willing to comply with Study Watch wearing and recharging requirements

Exclusion Criteria:

All Subjects

1. Any condition or situation the Principal Investigator determines as inappropriate for study inclusion

Phone Application

No additional exclusion criteria for phone application

Study Watch

1. Subjects with known severe allergy to nickel or metal jewelry

This sub-study is only open to sites participating in the RECOVER clinical study.

All subjects participating in the RECOVER clinical trial at active UNCOVER sites will be offered participation in this sub-study.