Unit 6 Test Terms (Sensation & Perception) Flashcards
Sensation
Receiving sensory input
Psycho physics
Relationship between input and experience
Stimulus
The input or information
Intesity
Amount of Stimulus
Threshold
Point of Detection (When you notice the stimulus)
Absolute Threshold
The smallest amount of a stimulus you can detect at least 50% of the time
Just Noticeable Differences (JND)
Change in Intensity. How much change before you notice?
Weber’s Law
JND Theory Intesity of stimulus is related to the amount of change to the intesity As intesity increases, the JND increases as well
Fechner’s Law
JND Theory Diminishing returns Constantly increasing intensity by the same amount increases the JND
Subliminal Perception
Unconscious perception (Movie theater shows quick pic of popcorn, you’ll begin to want it later on)
Sensory Adaption
More exposure=Less Sensitivity (The more time you spend in cold water, you’ll get used to it)
Signal Detection Theory
Expansion of Absolute Threshold Conflict of Stimuli How do you separate one stimuli from another
3 Factors of Signal Detection Theory
Type, Sensitivity, Cognitive
Selective Attention
Only focus on certain stimuli
Cocktail Party Effect
Your ability to focus on one conversation despite competing voices
The Visual System
The Dominant Sense
Light
Stimulus for Vision Visible electromagnetic waves
Wavelength
Color, Distance between peaks
Amplitude
Intensity, Height of waves
Ultraviolet
Too short for human response
Infrared
Too long for human response
Cornea
Outer Covering
Iris
Colored muscle around the pupil
Pupil
The center of the eye Controls light
Lens
Focuses light on Retina
Retina
Converts light into images
Accommodation
How the lens adjusts
Nearsightedness
fattens closer objects
Farsightedness
Flattens distant objects
Visual Receptors
Cells sensitive to light
Cones
Color vision, Sharpness, Daylight, Inside the Fovea
Foeva
Center of the Retina, Sharpest Vision
Rods
Black & White Vision Peripheral Vision Low light Outside the Foeva
Optic Disk or Blindspot
Insensitive to light No rods or cones Optic nerve exits retina
Color Vision
Three primary colors (Trichromatic Color Theory: Red, Green, Blue)
The Best Mix- The Three Attributes of Color
Hue or Wavelength, Brightness, Saturation( How pure is the color, No white-Fully saturated)
How do we see colors?
Absorption and Reflection Black (Total Absorption) White (Total Reflection)
Color Blindness
Inability to perceive differences between colors
Three types of Color Blindness
Red-Green, Blue-Yellow, No Colors (Very Rare)
Taste
Gustatory System Taste Buds- Receptor Cells Primary Tastes (1-Bitter, 2-Sour. 3-Salty, 4-Sweet)
Umami
Savory
Smell
Olfactory, Cilia
Touch
Somatosensory System Cutaneous or Skin
What Perception is not
Sensation
Perception is
Sensory input plus interpretation and is fluid, not static
Feature Analysis
Assembling elements into a whole
Bottom-Up Processing
Raw Data into something you recognize
Top Down Processing
Go beyond the data Prior knowledge and expectations Making inferences
Gestalt Psychology
Unified or Whole Brain prefers to perceive whole or complete images It fits in with our experiences