well, be that as it may. all i can say is that when i do DB presses and squeeze like hell at the top, 2 days later my inner pecs are sore as hell. When i just do barbell presses and don;t squeeze, i do not feel sore there, i feel more sore in the outer pecs.
Thus, and according to lee haney, squeezing targets the inner chest. Outer grips-outer pecs, and closer grips, inner pecs.