Study Guides (400,000)
US (230,000)
UC-Irvine (3,000)
PSYCH (60)
Midterm

PSYCH 9A Study Guide - Midterm Guide: Psychometric Function, Absolute Threshold, Cumulative Distribution Function


Department
Psychology
Course Code
PSYCH 9A
Professor
Bruce Berg
Study Guide
Midterm

This preview shows pages 1-2. to view the full 8 pages of the document.
1 Topics from lectures
1.1 Scientific thinking
Origins of experimental psychology:
Introspection (subjective, not inherently bad when considered as behavior, just a complex reporting tool)
- Earl o psholog defied itself as the siee of etal life ad oe of its earl ethods as alled
introspection
- Introspection is a form of self-report
- Perform a task, then provide a description of their conscious experience
- Nothing wrong with introspection. Its verbal behavior, just a complex behavior that is hard to predict
Determinism and discoverability
- Events have causes, and these causes can be discovered with some degree of confidence
- Statistical determinism: Usually multiple factors influence behavior and thus it is difficult to predict with
certainty what one will do at a given moment
Watson and Behaviorism
- John B. Watson: If psychology is to be scientific, it must measure something that is directly observable
- Behavior fits these criteria (founder of Behaviorism)
Theories vs facts (impossible to collect all the facts; need theories to simplify)
Logarithms: log(a*b) = log(a) + log(b); if ab = c, then loga(c) = b
Choosing experiments that are appropriate to the tools that you have
find more resources at oneclass.com
find more resources at oneclass.com

Only pages 1-2 are available for preview. Some parts have been intentionally blurred.

1.2 Thresholds
Absolute threshold (trigger for a gun)
- the smallest level of energy required by an external stimulus to be detectable by the human senses, including
vision, hearing, taste, smell and touch
Differee threshold, JND
- The smallest detectable difference between two things
Linear systems perfect predictions
Psychometric functions uulatie proailit futio → sstes ith oise
Psychophysics, methods for studying thresholds
Method of constant stimuli (requires a priori knowledge of threshold; generates Psychometric function)
- Presents the stimuli in a random order
Method of limits a ou feel this i a dotors offie
- convenient with patients but strong sequential dependencies
Method of adjustment (observer controls the stimulus intensity)
- The observer or the researcher continuously adjusts the stimulus until they can or cannot perceive it
Tracking methods (staircase or up/down)
Weer’s la
Feher’s la
“tee’s la
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version

Only pages 1-2 are available for preview. Some parts have been intentionally blurred.

1.3 Scales of measurement
Nominal (subjects 1, 2, 3, 4)
- Numbering subjects
Ordinal (subjects sorted by performance best to worst 1, 2, 3, 4)
- Ranking famous psychologist,
- Hardness: diamonds scratch, emeralds scratch, glass
Interval (temperature in Fahrenheit or Celsius, units are meaningful)
- Temperature: Fahrenheit, Celsius; IQ
Ratio (temperature in Kelvin, with absolute zero)
- Temperature: Kelvin; Stevens Power Law
- Example: Zero errors on a maze learning task
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version