Full Idea
Introspection has no phenomenology or, if it does, it always has the same phenomenology as the experience one is introspecting.
Clarification
'Phenomenology' is what-it-is-like
Gist of Idea
Introspection is the same as the experience one is introspecting
Source
Fred Dretske (Naturalizing the Mind [1997], §2.4)
Book Reference
Dretske,Fred: 'Naturalizing the Mind' [MIT 1997], p.62
A Reaction
There is a difference between looking at a tree, and being aware of yourself looking at a tree. You can be faintly depressed, and then become aware that you are faintly depressed. He is nearly right.