Presentation is loading. Please wait.

Presentation is loading. Please wait.

 PSYC 1020 Sensing and Perceiving I Sense Modalities Psychophysics Light, Eye & Brain Internet : http: // Dr. Jack Broerse.

Published byJesse Morgan Modified over 8 years ago

Similar presentations

Presentation on theme: " PSYC 1020 Sensing and Perceiving I Sense Modalities Psychophysics Light, Eye & Brain Internet : http: // Dr. Jack Broerse."— Presentation transcript:

1  PSYC 1020 Sensing and Perceiving I Sense Modalities Psychophysics Light, Eye & Brain Internet : http: // www.psy.uq.edu.au Dr. Jack Broerse

2 Visual elaboration Visual sensation (visual cortex) Skin sensation Auditory sensation Movement Conscious elaboration & thought Perceptual judgement Body sensation (cerebellum) Sensing States & Events: External versus Internal

3 External States & Events Sweet Salty Sour Bitter Taste & Smell Skin Senses Touch, Temperature, Pressure, Pain Vision Audition Hue, Brightness, Saturation (Density) Volume, Frequency, Tonal Quality (Density) Flowery Fruity Spicy BurnedPutrid Resinous

4 ? ? Extrasensory Perception: Phenomena in Science or Pseudoscience? !

5 Extrasensory Perception: Charles Darwin’s Scepticism Thought Transference (1870s) For: Alfred Russel Wallace Against: Charles Darwin Thomas H. Huxley (see Scientific American, October, 1996).

6 Internal States & Events Proprioception & Kinaesthesis Sensations of body/limb/muscle position & movement position & movement Interoception Vague sensations of internal organs & deep pain

7 Psychophysics & Measurement Stimulus to Conscious Experience Psychophysical Relationship

8 Classical Psychophysics Absolute Thresholds Sensory Modality Detection Threshold (Limen) VisionA candle flame at 60 km on clear dark night HearingA watch ticking at 6 m in quiet conditions TouchWing of a bee falling on your cheek from 1cm SmellOne eye drop of perfume in 3-room appartment TasteOne teaspoon sugar in 10 litres water

9 Difference Thresholds Just Noticeable Differences (JND)  L L1L1L1L1 L 2 +  L L2L2L2L2 L 1 +  L where WEBER’s LAW  L L  Constant Discriminations: Same vs Different

10 Thresholds & Decisions Signal Detection Theory (SDT) Stimulus Reality Response/Decision Same/PresentDiff/Absent Same/Present Diff/Absent HIT FALSEALARM MISS CORRECTREJECTION Hits – False Alarms Sensitivity Decision Criterion vs Key Words

11 Subliminal Perception? A case study for SDT Perceptual Defence Motivation Mental Set Key Words

12 Subliminal Perception? A case study for SDT Perceptual Defence Motivation Mental Set Key Words

13 The Stimulus for Vision Electromagnetic Radiation Frequency= 1/ Frequency= 1/ Wavelength ( ) Amplitude Visible Light Spectrum 400 – 700 nanometres (10 -9 m) = 10 15 m = 10 15 m = 10 7 m –10 13 m = 10 7 m –10 13 m

14 The Eye Anatomy & Physiology Retina (photosensitive rods & cones) Fovea (central vision) Lens Cornea Blind Spot Pupil Iris Optic Nerve + Approx. 9 cm at normal viewing distance

15 Retinal Rods and Cones Sensitivity & Dark Adaptation Log. Relative Sensitivity Log. Threshold Wavelength (nm) Minutes in Dark 1.0 2.0 4.0 3.0 5.0 6.0 7.0 1.0 2.0 4.0 3.0 5.0 6.0 400500600700 Rods Cones 300 x 1020304050 Cones Rods

16 Visual Cortex Brodmann Areas 17, 18, 19 Corpus Callosum Thalamus Cerebellum Retina to Brain Central Visual Pathway

17 Basic Visual Functions: Everyday Tests of Visual Acuity E RKF VMWXL Snellen Chart Landolt ‘C’ BN E C

18 Enmetropic (normal acuity) Myopic (nearsightedness) Hyperopic (farsightedness) Astigmatic (Blurring in some axis) Presbyopic (Accomodation problems) Optical Disorders: Focussing the image

Download ppt " PSYC 1020 Sensing and Perceiving I Sense Modalities Psychophysics Light, Eye & Brain Internet : http: // Dr. Jack Broerse."

Similar presentations

Sensation and Perception: How the World Enters the Mind

Sensation and Perception: How the World Enters the Mind
Chapter 8 Sensation and Perception. Section 1: Sensation Sensation and perception are needed to gather and interpret information in our surroundings.

Chapter 8 Sensation and Perception. Section 1: Sensation Sensation and perception are needed to gather and interpret information in our surroundings.
Electrical Activity of the Neuron

Electrical Activity of the Neuron
Sensation vs. Perception sensation: the experience of sensory perceptionsensation: the experience of sensory perception perception: the process of creating.

Sensation vs. Perception sensation: the experience of sensory perceptionsensation: the experience of sensory perception perception: the process of creating.
Sensation Overview How is perception different from sensation? What is psychophysics? What do sense organs do? How does vision work? How does this compare.

Sensation Overview How is perception different from sensation? What is psychophysics? What do sense organs do? How does vision work? How does this compare.
SENSATION AND PERCEPTION. DEFINITIONS  Sensation: the process in which our sensory receptors and nervous system receive and represent stimulus energies.

SENSATION AND PERCEPTION. DEFINITIONS  Sensation: the process in which our sensory receptors and nervous system receive and represent stimulus energies.
Phase Four: In the Brain  Goes to the Visual Cortex located in the Occipital Lobe of the Cerebral Cortex.  Feature Detectors.  Parallel Processing We.

Phase Four: In the Brain  Goes to the Visual Cortex located in the Occipital Lobe of the Cerebral Cortex.  Feature Detectors.  Parallel Processing We.
I. Sensation and perception chapter 6. Sensation [p186]  The detection of physical energy emitted or reflected by physical objects  Occurs when energy.

I. Sensation and perception chapter 6. Sensation [p186]  The detection of physical energy emitted or reflected by physical objects  Occurs when energy.
Myers’ PSYCHOLOGY (6th Ed)

Myers’ PSYCHOLOGY (6th Ed)
The Nature of Sensation Question to consider: How is light or sound converted into a message to the brain? The Basic Process Sensory Thresholds Subliminal.

The Nature of Sensation Question to consider: How is light or sound converted into a message to the brain? The Basic Process Sensory Thresholds Subliminal.
Sensation and Perception Part 1: Intro and Vision.

Sensation and Perception Part 1: Intro and Vision.
Sensation & Perception Unit 3 Chapter 4. Sensation Stimulation of sensory receptors and transmission of sensory info to the central nervous system (spinal.

Sensation & Perception Unit 3 Chapter 4. Sensation Stimulation of sensory receptors and transmission of sensory info to the central nervous system (spinal.
Process of taking in stimuli from the environment.

Process of taking in stimuli from the environment.
Sensation and Perception

Sensation and Perception
W EEK 6 S ENSATION & PERCEPTION Chapter 4. V ISION Wavelength (hue) Amplitude Purity Cornea Lens Iris Pupil Retina Transduction Optic disk Optic nerve.

W EEK 6 S ENSATION & PERCEPTION Chapter 4. V ISION Wavelength (hue) Amplitude Purity Cornea Lens Iris Pupil Retina Transduction Optic disk Optic nerve.
Warm Up 1. Find a group of 3 2.Pick up a new notebook sheet, a discussion sheet and a ch 5 notes sheet.

Warm Up 1. Find a group of 3 2.Pick up a new notebook sheet, a discussion sheet and a ch 5 notes sheet.
Sensation Psychology 3906 Introduction To catch a ball, we have to see it coming How does the external get internalized –That in essence, is what sensation.

Sensation Psychology 3906 Introduction To catch a ball, we have to see it coming How does the external get internalized –That in essence, is what sensation.
Myers’ PSYCHOLOGY (6th Ed)

Myers’ PSYCHOLOGY (6th Ed)
 Objective: Students will explain the difference between sensation & perception, identify some of the key terms for sensation, and explain how the eye.

 Objective: Students will explain the difference between sensation & perception, identify some of the key terms for sensation, and explain how the eye.
Sensation & Perception

Sensation & Perception

Similar presentations

Ads by Google