The regions of not localized between the reactant species in Fig. are considered as intramolecular density redistributions and are mostly shaped as intramolecular π-bonding orbitals. This is especially evident on the lower molecule (cyclopentadiene). For the X-polarization, these orbitals exhibit electron density accumulation from the intermolecular bonding orbitals. However, for the Y- polarization, these intramolecular π-bonding orbitals donate their electrons to the intermolecular bond. Thus, the effects of the cavity are to induce changes to the bonding structure of the reactant species, thus either facilitating or disallowing the bond formation depending on the cavity polarization direction.