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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)