  The thermodynamic and retrieval properties of fully connected
Blume-Emery-Griffiths networks, storing ternary patterns, are studied using
replica mean-field theory. Capacity-temperature phase diagrams are derived for
several values of the pattern activity. It is found that the retrieval phase is
the largest in comparison with other three-state neuron models. Furthermore,
the meaning and stability of the so-called quadrupolar phase is discussed as a
function of both the temperature and the pattern activity. Where appropriate,
the results are compared with the diluted version of the model.
