N-Back Test History
View and manage your N-Back working memory test results
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Understanding Your Metrics
d' (d-prime) Sensitivity Index
A signal detection theory metric measuring your ability to discriminate targets from non-targets. Higher d' (>3.0) indicates excellent discrimination; lower values (<1.0) suggest difficulty distinguishing signals from noise.
Hit Rate
The proportion of target stimuli you correctly identified as matches. A higher hit rate means fewer targets were missed.
False Alarm Rate
The proportion of non-target stimuli incorrectly identified as matches. A lower false alarm rate indicates better impulse control and discrimination.
Overall Score
A composite score (0-100) combining d' sensitivity (65%), overall accuracy (20%), and reaction speed (15%), with N-level bonus. Based on signal detection theory norms.