In signal detection theory, an internal cutoff above which the observer makes one response and below which the observer makes another response is known as a ______.

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In signal detection theory, researchers describe how an observer sets a decision boundary to separate “signal present” from “signal absent” responses. 
Option a: 'a. threshold' — While the term threshold is used in many contexts to denote a boundary where a response changes, in SDT the precise term for that internal boundary used to decide between two responses is not 'threshold' but 'criterion.' Threshold often appears in other contexts (like sensory thresholds) but is not the standard SDT term for the decision boundary between responses. 
Option b: 'b. limit' — This word can convey a boundary or cap in general language, but it is not the established SDT terminology for the internal cutoff that governs response choice. It lacks the formal connection to decision criteria in SDT. 
Option c: 'c. criterion' — This is the standard term in signal detection theory. The observer places a criterion (decision boundary) along the internal evidence axis; if the internal response exceeds the criterion, the observer says one response (e.g., signal present), otherwise the other response (e.g., signal absent). This directly captures the concept of an internal cutoff used for response decisions. 
Option d: 'd. series' — This term does not relate to the decision boundary in SDT. It might be used in other contexts (like data or mathematical series), but it provides no meaningful link to the observer’s response criterion in signal detection theory. 
Across these options, the only choice that aligns with the SDT framework as the internal cutoff for decision making is 'criterion,' since it directly names the boundary that separates the two possible responses based on internal evidence.

PSYC 230 A SP25 Unit 2 Lecture

In signal detection theory, an internal cutoff above which the observer makes one response and below which the observer makes another response is known as a ______.

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