Two experiments examined how different frustration contexts affect the instrumental and emotional responses of 4-to 5-month-old infants. Three different frustrating contexts were investigated: loss of stimulation (extinction), reduction in contingent stimulation (partial reinforcement), and loss of stimulus control (noncontingency). In both experiments, changes in arm activity and facial expressions of anger and sadness coded according to the Maximally Discriminative Facial Movement Coding System (MAX) were the measures of frustration. Both experiments showed that (a) arm responses increased when the contingent stimulus was lost or reduced but decreased when control of the stimulus was lost under noncontingency, (b) MAX-coded anger, but not MAX-coded sad or blends of anger and sad, was associated with frustration, and (c) the pattern of anger and arm responses varied with the frustration context. When contingent stimulation was lost or reduced, both anger and arm responses increased, but when expected control was lost under noncontingency, arm responses decreased while anger increased.Infants' responses to distinctive eliciting contexts have a long history in the assessment of emotions during the 1st year of life. For example, tickling, having the infant taste lemon juice in contrast to sweet and bitter solutions, sudden violations such as that produced by a jack-inthe-box, the entry of a masked stranger, arm restraint, or removal of a teething biscuit have all been used to elicit facial expressions in young infants (Bendersky, Sullivan, Alessandri, & Lewis, 1995;Braungart-Reiker & Stifter, 1996;Charlesworth, 1969;Fox & Davidson, 1986;Granchrow, Steiner, & Daher, 1983;Kochanska, Coy, Tjebkes, & Husarek, 1998;Rosenstein & Oster, 1988;Scarr & Salapatek, 1970;Skarkin, 1977;Sroufe & Wunsch, 1972;Steiner, 1979;Stenberg, Campos, & Emde, 1983). These situations represent only a sample of the various contexts that have been devised. Studying facial expressions and behavior in varied contexts (a) can demonstrate whether there are relatively unique sets of facial expressions for a given context and whether the same expression serves different functions across contexts and (b) allows some confidence about the "signal value" of infant facial expressions (Bennett, Bendersky, & Lewis, 2002;Lewis & Michalson, 1983). Examination of facial expressions across a variety of well-controlled and systematically varied contexts should also help to clarify issues related to infant facial expressions and their organization early in development.The literature on infant facial expression has many problems (Lewis & Michalson, 1983). First is the issue of emotional expression as an index of emotional state. Others are the relation between emotional expressions and experiences, the connection between emotional state and
NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript experience, and finally, the relation between specific elicitors and facial expressions. Differential emotions theory (DET; Izard & Ackerman, 2...