Perception
Conscious sensory experience
Sensation
Simple process of first sensing something
7 Steps of Percetion
Distal Stimuli
Proximal Stimuli
Receptor Process
Neural Processing
Conscious Experience
Recognition
Action
Step 1: Distal Stimuli
The object itself existing
Step 2: Proximal Stimuli
Representation of stimuli on sensory receptors. Image on retina.
Principle of Transformation
Stimuli (and responses created by stimuli) are transformed, or changed, between the distal stimulus and perception.
Principle of Representation
Perception is based on representations of stimuli formed on the receptors and the resulting activity in the person’s nervous system.
Step3: Receptor Processes
Receptors are activated, results in electrical representations.
Transduction
Changes environmental energy to nerve impulses.
Step 4: Neural Processing
Transmission from receptors to the brain (through nerves)
Processing or modification of signals (categorizing)
Knowledge
Any information the perceiver brings to a situation. Influences our ability to categorize things.
Bottom-Up
Based on incoming stimulus (data-based processing)
Top-Down
Based on previous knowledge (knowledge-based processing)
What we study in Perceptual Process
Stimulus, Physiology, Behaviour
Stimulus-Perception Relationship (A)
Relate stimulus to behaviour.
Psychophysics
measures the relationship between the physical and the physiological
Oblique effect
People see vertical or horizontal lines better than lines oriented obliquely (any other angle)
Grating Acuity
Measure the smallest width of lines that participants can detect
Stimulus-Physiology (B)
Stimulus to physiological response. Measure brain activity
Physiology-Behaviour (C)
physio to biological response, sense organ to the brain.
Absolute Threshold
The smallest stimulus level that can just detected.
Thresholds
Measure the limits of sensory systems.
Psychophysics Methods
Method of Limits, Method of Constant Stimuli, Method of Adjustment, Just Noticeable Difference
Method of Limits
Stimuli of different intensities presented in ascending and descending order.