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Festinger and Maccoby (1964) while studying the effects of distraction upon attitude change concluded that counterarguing is the mediator of distraction effects, while Haaland and Vankatesan (1968) concluded that comprehension is the major mediator. Possibly, then, counterargument production is only elicited under a limited set of conditions. Brock's (1967) research indicated that counterargument production increases as the discrepancy between the subject's own position and that advocated by the communication increases . Thus, it was hypothesized that counterarguing mediates the effects of distraction upon attitude change only when the discreoancy is sufficient to evoke counterarguing. To test this hypothesis , the following study was conducted.