In single-blind peer review, it’s just the reviewer. In double-blind, it’s both reviewer and author(s) with different levels of author blinding. Double-blind arguably reduces reviewer bias, but depending on the field and subject matter, once an author is recognizable, double-blinding doesn’t truly mask them.
I’ve never seen that. The reviewer is anonymous, not the authors.
In single-blind peer review, it’s just the reviewer. In double-blind, it’s both reviewer and author(s) with different levels of author blinding. Double-blind arguably reduces reviewer bias, but depending on the field and subject matter, once an author is recognizable, double-blinding doesn’t truly mask them.