Posner and his colleagues proposed a seminal theory of how alerting influenced information processing over 50 years ago (Posner et al., Memory & Cognition, 1, 2–12, 1973). In this study, participants were presented with warning signals at varying intervals before a target, and participants were asked to produce a spatial discrimination response. Trials in which participants were played a warning signal were compared to trials without a warning signal to understand the effect of phasic alerting using reaction time (RT) and error rate (ER). Posner and colleagues observed a general speed-accuracy trade-off (SAT) across conditions, in which faster RTs led to higher ER, and concluded that phasic alertness shifts response criteria without improving the efficiency of information processing. More recent research has questioned whether this theory of alerting applies generally across all time-courses and conditions. The current meta-analysis aimed to test Posner’s theory of alerting (1975) using all available data in the field that closely matches the methodology used in Posner et al.’s Memory & Cognition, 1, 2–12, (1973) influential study. After including data from 16 published experiments across three different signal-target foreperiod durations, our conclusions support that while a speed-accuracy trade-off is likely present at shorter foreperiods (50 ms), the longer foreperiods (200 and 400 ms) show evidence of an increase in the rate of information processing when the participant was alerted.
