Unit 2 Flashcards
Top-down processing
information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations (interpret what our senses detect)
Bottom-up processing
information processing that begins with the sensory receptors and works up to the brain’s integration of sensory information (enables your sensory systems to detect lines, angles, and colors that form the images)
Absolute threshold
the minimum stimulus energy needed to detect a particular stimulus 50% of the time
Difference threshold
the minimum difference between two stimuli required for detection 50% of the time (a just noticeable difference)
Subliminal messaging
presenting something below a person’s absolute threshold for conscious awareness
Sensory adaptation
reduced sensitivity in response to constant stimulation (nerve cells fire less frequently)
Perceptual sets
mental tendencies and assumptions that set us up to perceive one thing and not the another
Feature detectors
nerve cells in the brain’s visual cortex that respond to specific features of a stimulus, such as shape, angles, lines, or movement
Parallel processing
processing many aspects of stimulus or problem at the same time
The Gestalt concept
an organized whole, our tendency to integrate pieces of information into meaningful wholes
The Gestalt principles
Closure, continuation, similarity, symmetry, proximity, and figure-ground
Depth perception
the ability to see objects in three dimensions, although the images that strike the retina are two dimensional (allows us to judge distance)
Retinal disparity
By comparing images from the two eyes, the brain computes distance (greater the disparity between the two images, the closer the object)
Perceptual constancy
perceiving objects as unchanging (having consistent color, shape, and size) even as illumination and retinal images change
Cochlea
A fluid-filled shaped cavity located in the inner ear that plays an important role in hearing, the fluid moves in response to vibrations and nerve endings transform vibrations into electrical impulses that are sent to the brain
Kinesthetic sense
sense of movement (system for sensing the position and movement of individual body parts)
Vestibular sense
sense of balance and body position
Synesthesia
when your brain routes sensory information through multiple unrelated senses, causing you to experience more than one sense simultaneously (one sense produces another)
ESP (Extrasensory perception)
the controversial claim that perception can occur apart from sensory input (includes telepathy, precognition, and clairvoyance)
Predictive power of dreams
Precognitive dreams are the most widely reported occurrences of precognition. Usually, a dream or vision can only be identified as precognitive after the putative event has taken place. (also a controversial claim)
Stimulus
any object or event that elicits a sensory or behavioral response
Classical conditioning
a type of learning in which we link two or more stimuli and anticipate events (biologically adaptive because it helps humans and other animals prepare for good or bad events)
NS (Neutral stimulus)
a stimulus that evokes no response before conditioning
US (Unconditioned stimulus)
a stimulus that unconditionally - naturally and automatically - triggers a response
CS (Conditioned stimulus)
an originally neutral stimulus, after association with an unconditioned stimulus, comes to trigger a conditioned response
UR (Unconditioned response)
an unlearned, naturally occurring response to an unconditioned stimulus
CR (Conditioned response)
a learned response to a previously neutral (but now conditioned) stimulus
Extinction
in classical conditioning, the weakening of a conditioned response - when an unconditioned stimulus does not follow a conditioned stimulus (in operant conditioning, the weakening of a response when it is no longer reinforced)
Spontaneous recovery
the reappearance, after a pause, of a weakened conditioned response