Signal Detection Theory: Psychophysical Concepts and Applications

What does signal detection theory qualify?

The response of an observer to the presentation of a signal in the presence of noise.

What concept does signal detection theory reject?

The concept of a threshold.

What does signal detection theory emphasize?

Expectation and reward contingencies.

What is a key idea of signal detection theory regarding stimuli?

There is no such thing as a stimulus in isolation.

What are the goals of signal detection theory?

To define the ability to detect a target stimulus while balancing sensitivity and false alarms.

What does sensitivity refer to in signal detection theory?

The degree to which one can detect weak stimuli.

What is a 'Hit' in signal detection theory?

When a stimulus is presented and the observer responds 'yes.'

What is a 'Miss' in signal detection theory?

When a stimulus is presented and the observer responds 'no.'

What is a 'False Alarm' in signal detection theory?

When a stimulus is not presented and the observer responds 'yes.'

What is a 'Correct Rejection' in signal detection theory?

When a stimulus is not presented and the observer responds 'no.'

What does the Receiver Operating Characteristic (ROC) plot represent?

The graphical plot of the hit rate as a function of the false alarm rate.

What is an advantage of signal detection theory?

It controls for response biases and false alarms.

What is a disadvantage of signal detection theory?

It is harder to understand than threshold-based models and can require many trials.

How does signal detection theory relate to quantitative epistemology?

It quantifies how well we detect signals in noise.

In what fields is signal detection theory applied?

It is applicable to almost any discrimination or decision-making situation.

How do cell phones and computers utilize signal detection theory?

They rely on it to decide whether they received a signal (one) or not (zero).

Where was signal detection theory originally developed?

At Bell Labs for telecommunications.

What does signal detection theory provide a basis for?

Deciding perceptions and behaviors.

What does signal detection theory assume about noise and signal distributions?

It assumes normal distributions of noise and signal.