Implicit associative responses were manipulated in a verbal discrimination task involving a mixed list of intrapair, interpair, interitem-AR, and control conditions in combination with three rates of presentation (1:1, 2:2, and 4:4 sec). The intrapair condition was significantly superior to the control at all three presentation rates. The interpair condition was inferior to the control at the 1:1 sec rate, equal to the control at the 2:2 rate, and superior at the 4:4 rate. The interitem-AR condition was equal to the control at the 1:1 sec rate, but superior at the 2:2 and 4:4 rates. The results were interpreted as consistent with the hypothesis that multiple higher order strategies may be invoked in such a mixed list design and that these strategies differ in levels of complexity, resulting in a complex interaction with rate of presentation.According to the frequency theory of verbal discrimination (VD) learning (Ekstrand, Wallace, & Underwood, 1966), the presence of associatively related items has a facilitative or an inhibitory effect on the acquisition of a VD list depending on whether the implicit associative response (IAR; Bousfield, Whitmarsh, & Danick, 1958) acts to increase or to decrease the intrapair subjective frequency differential between the right (R) and the wrong (W) items of a pair. The theory predicts that the learning of lists containing associatively related Wand R items in two different pairs (an interpair condition), or within a single pair (an illtrapair condition) would be more difficult than learning a control list of associatively unrelated items, since the differential frequency cue is assumed to be reduced by the increment in subjective frequency of W items, in the interpair and intrapair conditions, caused by the IAR to the R items. When the list contains associatively related R items and unrelated W items (an interitem-AR condition), however, learning should be facilitated relative to the control condition. Eckert and Kanak (1974) and Kanak and Jones (I974) have presented reviews of the literature regarding these th ree classes of IAR manipulations. Substantial support for the prediction of interference for the interpair condition has been obtained in several studies. The intrapair condition, however, has produced conflicting results with some investigators (e.g., McCarthy, 1973; Palermo & Ullrich, 1968)
413(1969) suggested that subjects employ a "tagging" mechanism, compensatory to the reduction of the differential frequency cue which results from the IAR. According to the tagging hypothesis, after the subject recognizes the presence of irItrapair associations, during the feedback interval he uses the strategy of "tagging" the underlirIed R item as "correct" and then collapses the tag over the association for memory storage (e.g., rehearses "table-chair," "chair is correct"). On the subsequent anticipation or test trial, the subject needs only to recognize the rehearsed irItrapair association ("table-chair") upon presentation of the pair and then retrieve from memory the "tag" (...