Analyses of expectation bias generally consist of determining whether the anticipatory effects on trials following contiguous trials of one stimulus type show a significant trend toward increasing with the number of preceding contiguous trials.
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Predictive physiological anticipation preceding seemingly unpredictable stimuli: a meta-analysis.
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On the other hand, it is still possible that the highly significant overall effect reported here could be explained by a “filedrawer effect” if negative findings were under-reported for some reason.
Several studies reporting significant or near-significant anticipatory effects were excluded because we could not determine the direction of the post-stimulus effect from either the reports themselves or from email correspondence with the authors (Bierman, 2007 , fMRI component; Hartwell, 1978 ; Don et al., 1998 ; Lehman et al., 2000 , 2001 ; McDonough et