Based on Scheibe's (1979) concept of sagacity, the first purpose of this research was to assess the role of vigilance in a judgment task wherein subjects "read between the lines" of target persons' word associations Second, on the basis of the locus of control and cue explication literature, we tested the prediction that internals would be more successful judges than would externals only when a vigilant strategy was not emphasized in the task instructions In keeping with the first prediction, judges who used the vigilant strategy of circling what they thought to be clues did significantly better on the judgment task and on a postjudgment clue awareness task However, the results provided no support for the predicted interaction of instructions and locus of control These null findings emerged m a conceptual replication using a difFerent version of the judgment task and a different form of cue exphcation In both studies, externals did significantly better than did internals on the clue awareness task Finally, a supplementary study tested whether good-and poor-vigilant judges processed different clues in the judgment task Analyses of the clues circled while making judgments revealed that, relative to poor judges, good judges more often selected the most important clue in the task, and the discrepancy between good and poor judges increased over trials of the task Together with previous studies, the results provide strong support for conceptualizing the judgment task in terms of Scheibe's concept of sagacity Implicit in the enterprise of psychological research is the assumption that the causes of behavior often are not obvious Careful study and controlled investigation are necessary because the ways in which people think and act often have hidden influences Taking this logic one step further, we might assert that, if there is such a thing as Correspondence and requests for reprints should be addressed to S J Dollinger, Ddlingeretal "psychological-mmdedness," it would seem to involve the ability "to read between the lines of behavior "'One recent senes of studies has focussed on this ability to read between the lines in the context of a word-association clinicaljudgment task (Dollinger, Reader, Marnett, & Tylenda, 1983, Dollinger & Riger, 1984 In this task, subjects attempt to identify which of three "suspects" has imagined the commission of a theft In the videotape version of the task, they can make their judgments by recognizing the implications of suspects' word associations, facial expressions, and reaction times to vanous critical and noncntical stimulus words For the paper-and-pencil version of the task, judgments are based solely on word associations that are juxtaposed for the three suspects m each of the 10 judgment triads Across a senes of 6 studies, subject-judges have been quite successfiji at "catching the thief" Most samples yielded significantly-better-than-chance judgments as a group, and between 40% and 60% of individual subjects attained more hits than would be expected by chance Much of this work has been grounded in Scheibe's (1978Scheibe's ( , 1979) conceptualization of "the psychologist's prediction modes" (sagacitv, authority, and acumen), and the to-be-predicted person's tools for avoiding prediction (mirrors, masks, lies, and secrets) Scheibe's conceptual categories are particularly apropos in that, by the nature of the task, the suspects are protected by a kind of mask Moreover, they conceal a secret (the scnpt that they imagined performing), and the thief suspects may be motivated to lie about their guilt Finallv, the word association procedure involves reflection of an "image"the response word mirrors the stimulus word in a fi...