Chapter 5: Sensation and Perception Flashcards
The Order of Stimulus to Perception
- Stimulis
- Receptors
- Neural Impulses
- Perception
Absolute Threshold
Asks about the absolute limits of sensitivity.
The lower the absolute threshold, the greater the sensitivity.
Difference Threshold
Asks about the difference that can be detected between stimuli.
Webers Law
The noticeable difference is equal to the magnitude of the stimulus with which the comparison is being made.
Sensory Adaptation
When you become desensitized to a stimulus when it is constant.
happens so that you can focus on things that change and ignore what doesnt.
Bottom-up Processing
“What am I seeing?”
Top-down Processing
“Have I seen this before?”
Continuity
Items that continue a pattern belong together.
Olfaction
Scent receptors line the upper nasal cavity.
Odour molecules lock onto certain sites, which send messages to the brain.
Anosmia
Inability to smell
Ageusia
Inability to taste
Layers of the retina
- Photoreceptors
- Bipolar cells
- Ganglion cells.
Optic Disc
The area of the retina where the optic nerve leaves the eyes, has no rods or cones
Transduction
Converting stimulus energy into neural impulses that can be interpreted by the brain
Trichromatic Theory
Believes that there are 3 types of colour receptors in the retina: Blue, green, or red, and that the visual system combines activity from these cells to allow us to see all colours.
