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This article presents information on an indirect method for increasing the rate of social interaction in autistic child. This article will address only one dimension of the autistic syndrome, the characteristically low frequency of social interaction. The problem of low rates of social interaction has been investigated not only in relation to autistic children but with other types of populations as well. Social scientists increased the number of social interaction of three withdrawn mental patients by prompting and directly reinforcing such behavior. The tedious process of prompting and shaping social speech, however, is unnecessary in cases in which the relevant skills are already in the S's repertoire, but are manifested at a very low rate.

We examine the fluid-solid transition for the potential with two Yukawa terms (one attractive and the other repulsive) and a hard core by exploration of the parameter space of (K1, Z1, and Z2), i.e., the parameters of interaction strength and interaction ranges, respectively. We apply the single-phase crystallization rule of Giaquinta and Giunta (1992) by searching for the conditions where the residual entropy reaches zero. To obtain accurate entropy properties, we adopt the self-consistent closure theory of the zero-separation genre. This closure gives accurate thermodynamic properties. The Ornstein–Zernike equation is solved to obtain the correlation functions. The structure factor S(q) is examined with respect to its cluster-cluster peak, whose value is another indication of phase transition according to Hansen and Verlet (1969). We discover that the parameter Z1 (which determines the range of attractive forces) is important in crystal formation, so long as sufficient attraction (parameter K1) is present. If the range of attraction is too narrow, strength alone is not adequate to satisfy the Giaquinta rule or to solidify at given concentration and temperature. The control of the range of repulsion rests with the Z2-parameter. Its variations can bring about a high peak in S(q) at zero wave number (i.e., at q=0). Implications for the crystallization of protein and colloidal solutions are discussed. [ABSTRACT FROM AUTHOR]