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PSY1101 (866)
Lecture

SENSATION.docx

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Department
Psychology
Course
PSY1101
Professor
Rosalinde Klempan
Semester
Winter

Description
SENSATION (CH 6) AGENDA: 1. BASIC PRICIPLES  THRESHOLDS  SENSORY ADAPTATION 2. VISION  LIGHT ENERGY  THE EYE VISUAL INFORMATION PROCESSING   COLOUR VISION SENSATION: o DETECTION AND ENCODING BY SENSORY RECEPTORS OF STIMULI ENERGIES IN ENVIRONMENT (EG. LIGHT ENERGY, SOUND WAVES) o ENCODED AS NEURAL SIGNALS PERCEPTION o SELECTING ORGANIZING AND INTERPRETING SENSATIONS (HIGHER LEVEL) BASIC PRINCIPLES THRESHOLDS: ABSOLUTE THRESHOLD (A.T):  MINIMUM STIMULUS MAGNITUDE THAT CAN BE DISCRIMINATED FROM NO STIMULUS AT ALL  CORRECT DETECTION 50% OF THE TIME DEFINES A.T PSYCHOPHYSICS  STUDY OF RELATIONSHIPS BETWEEN STIMULUS ENERGIES AND OUR PSYCHOLOGICAL EXPERIENCE SIGNAL DETECTION THEORY  PROPOSES NO "ONE" A.T BUT DETECTION DEPENDS ON EXPECTATIONS, MOTIVATION, EXPERIENCE AND LEVEL OF FATIGUE  USED TO PREDICT WHEN WE WILL DETECT FAINT STIMULUS DIFFERENCE THRESHOLD (JUST NOTICEABLE DIFFERENCE JND)  MINIMM DIFFERENCE IN STIMULUS MAGNITUDE BETWEEN TWO STIMULI NECESSARY TO DETECT A DIFFERENCE WEBERS LAW (ERNST WEBER: 1834)  JND A CONSTANT MINIMUM PERCENTAGE NOT A CONSTANT AMOUNT IN GENERAL: LARGER THE SIZE OF ORGINAL STIMULUS , THEN SENSORY SYSTEM LESS SENSITIVE TO INTENSITY CHANGE SENSORY ADAPTATION  SENSITIVITY TO AN UNCHANGING STIMULUS DIMINISHES (SENSORY RECEPTOR SENSITIVITY RELIES UPON CHANGE) VISION  DEPENDS UPON:  PHYSICAL LIGHT STIMULUS  ABILITY TO TRANSFORM LIGHT ENERGY INTO SIGHTS TRANSDUCTION:  PROCESS BY WHICH SENSORY SYSTEMS TRANSFORM STIMULUS ENERGY INTO NEURAL IMPULSES LIGHT ENERGY:  ELECTROMAGNETIC  TRAVELS IN WAVES WITH VARYING WAVELENGTHS EYESSENSITIVE TO:  SMALL PORTION OF WAVELENGTHS: 400 TO 700 NANOMETER WAVELENGTHS: DETERMINES HUE (COLOUR) WAVE INTENSITY: DETERMINES BRIGHTNESS THE EYE: CORNEA  TRANSPARENT SURFACE MEMRANE PUPIL  OPENING CONTROLLED BY IRIS (MUSCLE ADJUSTS TO LIGHT LEVEL) LENS  FOCUSES INCOMING LIGHT RAYS BY ACCOMODATION (CHANGING SHAPE) RETINA  THIN MULTILAYERED TISSUE ON BACK SURFACE  CONTAINS RECEPTOR CELLS THAT CONVERT ENERGY INTO NEURAL IMPULSES  SENDS IMPULSES TO BRAIN TWO TYPES OF RETINAL RECEPTORS 1. RODS  MORE LIGHT SENSITIVE THAN CONES  DETECT BLACK, WHITE AND GREY  MOSTLY IN PERIPHERY 2.
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