Sensitivity (d’) = z - zĬriterion (c) = -1/2*(z(Hit) + z(False Alarm)) Participants may be liberal (bias to say yes signal present), conservative (bias to say no signal is present), or balanced. Sensitivity (d’): d’ measures how well the participant can distinguish the presence of a signal from its absence (see below).ĭecision Criterion (c): C measures the point at which a participant is willing to say a signal is present (see below). Z-score: Z-score measures performance in terms of the number of standard deviations the signal distribution is above the noise distribution (see below). The matrix informs the calculation of the participant’s: Step 3: Researcher analyzes the participant’s performance using a confusion or detection matrix.
Miss Rate: N Misses / (N Hits + N Misses)įalse Alarm (FA) Rate: N False Alarms / (N False Alarms + N Correct Rejections)Ĭorrect Rejection (CR) Rate: N Correct Rejections / (N False Alarms + N Correct Rejections) Consciousness and Cognition,Ħ03–633.Step 2: Researcher calculates the hit, miss, false alarm, and correct rejection rates - the participant’s probability of response type across trials: Subconscious detection of threat as reflected by an enhanced First citation in article Crossref, Google Scholar
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#SIGNAL DETECTION THEORY EXPLAINED MANUAL#
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