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![Brain scans show study participants who had normal hemodynamic response functions and showed a measurable decrease in amplitude between the baseline and second scans also demonstrated gains in their BrainHealth Index.](https://images.ctfassets.net/hg121nxz9t5c/4af8Ub1xkp8JByzUUkYjMF/e7a70641c9f9c38ed1b49f13194f8717/Picture1.jpg?f=faces&q=15&fit=fill&w=560&h=472)
Figure 1. Researchers discovered that study participants who had normal hemodynamic response functions and showed a measurable decrease in amplitude between the baseline and second scans (indicating increased efficiency, as in the example above), also demonstrated gains in their BrainHealth Index.