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That is my first attempt to map the neurotech space. It covers 44 companies, structured in three categories based on what they do (Chart 1). 

In this article three themes are covered: 

1. diagnostics

2. interventions that affect/stimulate the brain

3. brain research and development of brain interfaces.

Chart 1. Selected neurotechnology startups by their applications in healthcare

Within each group, companies are aligned around the core principles that their technology is based on. For example, measuring blood flow, tracking electrical activity of the brain, or testing for certain proteins. 

Chart 2. Selected neurotechnology startups by their applications in healthcare and technology