Chapter 4 Powerpoint : Intro and Vision . Detect. Interpreting. Environment. taste. smell. attention. Vestibular Sense. Sensation and Perception. Sensory Information. Senses. sight. touch. Kinesthesis. processing. Organizing. brain. hearing. Warm up.
Chapter 4 Powerpoint: Intro and Vision
Sensation and Perception
What is sensation? What is perception?
Sensation-- the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
Perception--the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events.
Information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations.
Bottom- up processing
Analysis that begins with the sensory receptors and works up to the brain’s integration of sensory information.
Bottom up Theories
Top Down Theories
The study of the relationship between physical characteristics of stimuli and our psychological experience of them
Intensity of stimulus
TICKET OUT: What are sensation and perception? How does our perceptual system help us to interpret the world around us? Explain.
Short Video About Sensation and Perception
How does the visual system work?
Distal Stimulus– the object in the outside world
Proximal Stimulus– the object as it is projected on the retina (upside down)
Animation of how this works...
TERMS: Distal stimulus, proximal stimulus, fronto-parallel plane, Distal Object, Percept
What is color?
Transductionconversion of one form of energy to another
In sensation, transforming of stimulus energies into neural impulses
Wavelengththe distance from the
peak of one wave to the peak of the next
Dimension of color determined by wavelength
Amount of energy in a wave determined
Rods are sensitive only to black and white and are sensitive to light and dark.
Cones come in three types, each sensitive to a different color: red, green, and blue. Cones are concentrated in the center of the retina, while rods form the periphery of the retina.
There are 3 different types of cones that respond to different types of wavelengths.
•Short-wavelength cone receptorsβ
•Middle-wavelength cone receptorsγ
•Long-wavelength cone receptors.ρ
Different “colors” of light stimulate the different cone cells in different combinations, thus accounting for the different colors we see.
This is called the Trichromatic Theory of Color Vision
number in the box could
be color blind
Color Blindness Simulator
On worksheet fill in definition and one example.
How does the eye work like a camera?
Visual Information Processing
How do they work???
Vision (myopic) Vision (hyperopic)
What is an illusion?
Vase or Face?
“Yes or No” Sculpture by Markus Raetez
Is the dark side in the front or the back?
Devil’s Tuning Fork
How many legs does this elephant have?
Penrose Triangle (Ernst, 1987)
Hermann Grid Illusion Hermann (1870)
Researchers have traditionally used what is known as lateral inhibition to explain why people see these gray areas. This phenomena demonstrates a very important principle of perception: we don't always see what's really there. Our perceptions depend upon how our visual system responds to environmental stimuli and how our brain then interprets this information. New theories suggest there might be a better explanation.
How it actually looks
How does it work?