What is the test for reversing a denial of a disability claim?

In reviewing the Secretary's determination, we will reverse the denial of a disability claim only if the Secretary applied improper legal standards or the Secretary's findings are not supported by substantial evidence in the record as a whole. Gamer v. Secretary, 815 F.2d 1275, 1278 (9th Cir.1987); Martinez v. Heckler, 807 F.2d 771, 772 (9th Cir.1986). Substantial evidence is "such relevant evidence as a reasonable mind might accept as adequate to support a conclusion." Gamer, 815 F.2d at 1278.