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Table 1 Mean Hit Rates and False Alarm Rates for the Target-based Search Training, Standard Targetless Search Training (sTST) and Combined Search Training (CST) Groups in Experiment 1, Semantic and Alphabetic Training Groups in Experiment 2, Fixed Reward (FR) and Performance-contingent Reward (PR) Groups in Experiment 3 and the Enhanced Targetless Search Training (ETST) and Practice Only (PO) Groups in Experiment 4 (overlap shown where relevant for Experiments 3 and 4; standard deviations shown in brackets)

From: Improved X-ray baggage screening sensitivity with ‘targetless’ search training

Experiment Training group Hit rate False alarm rate
   Overlap Non-overlap Overlap Non-overlap
Experiment 1 Target-based 0.74 (0.10) 0.38 (0.17)
  sTST 0.62 (0.10) 0.15 (0.09)
  CST 0.70 (0.09) 0.19 (0.07)
Experiment 2 Semantic 0.61 (0.14) 0.14 (0.09)
  Alphabetic 0.61 (0.12) 0.18 (0.12)
Experiment 3 FR 0.40 (0.05) 0.67 (0.05) 0.22 (0.08) 0.23 (0.08)
  PR 0.42 (0.07) 0.67 (0.07) 0.22 (0.10) 0.22 (0.10)
Experiment 4 ETST 0.44 (0.07) 0.81 (0.07) 0.15 (0.05) 0.14 (0.05)
  PO 0.41 (0.07) 0.74 (0.07) 0.17 (0.08) 0.15 (0.08)