PSYC 1001 1st Edition Lecture 22 Outline of Last Lecture I. Differences between the right and left hemispherea. Left-Hemisphereb. Right-HemisphereII. Chapter 6: Sensation and Perceptiona. Bottom-Up Processingb. Top-Down ProcessingIII. SensationOutline of Current Lecture I. Signal Detection TheoryII. Difference Thresholda. Weber’s Lawb. Subliminal StimulationCurrent LectureI. Signal Detection Theory: Attempts to predict how and when the presence of a faint stimulus (the signal) is detected against the background noise.a. Advantage over the classical psychophysics is that it takes into account:i. Intensity of the stimulusii. Background noiseiii. And experience, expectations, motivation, fatigue and response biasb. Basicsi. Give a person a real signal half of the trials1. No signal on half of the trialsa. These are called catch trials: Trials in which stimulus is NOT presented.b. Randomly mixedc. Four possible outcomes:i. Hit: Signal present Detectedii. Miss: Signal present Not detectediii. Correct Rejection: Signal not present Not detectediv. False Alarm: Signal not present Mistakenly detected II. Difference Threshold: Minimum difference between the two stimuli required for detection 50% of the time. a. Just Noticeable Difference (JND)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.b. Weber’s Law: To be detected as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount).Change in Intensity = ConstantOriginal Intensity 2 grams = 180 grams 40III. Subliminal Stimulation: Perceive something below one’s absolute threshold for conscious awareness.a. Two claims:i. Can unconsciously send a message.ii. Message has a strong effect on behavior.1. Unconsciously sensing a messagea. People do detect subliminal messages under some conditions.2. Strength of the effecta. A testi. Example: Tell a story about feet and then give them this:1. F E _ T2. F E E
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