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Typically, developing children as young as 5 months of age may be conditioned to produce a motor response contingent on the presence of an auditory stimulus (Wilson & Thompson, 1984). The behavior, usually a head turn, is reinforced by an appealing visual display. More recent studies confirm that frequency-specific thresholds may be obtained from infants at developmental levels of 5–6 months, enabling accurate evaluation of hearing sensitivity regardless of type, degree, or audiometric configuration (Bernstein & Gravel, 1990; Diefendorf, 1988, 2003; Gravel, 1989; Gravel & Wallace, 1999; Nozza & Wilson, 1984; Talbott, 1987; Widen et al., 2000).