fdesalvo said:
I think maybe thicker is
less resonant. Resonance is a sympathetic vibration, and tends to consume energy. A thicker neck is going to have more inertia and thus be more stable, so it'll react less to the string vibrations. Their influence is too small. You end up with a "richer" tonal character, which many (if not most) attribute to resonance, but is actually due to the reduced absorption of higher-order harmonics in the string(s), leaving those vibrations for the pickups to sense. It's also why electric guitar bodies have so little influence on the overall tone. Too much inertia in the body. The strings are beating against a brick wall.
Acoustics are the exact opposite. You
want the neck/body to resonate, otherwise you won't hear the thing. So, they use thin/light/stiff woods to encourage that.