Chapter 5 Flashcards
Detecting a signal depends on the signal’s __ and our __ state
strengthpsychological
More false alarms with heightened __
responsiveness
Ability to catch a faint signal diminishes after about __ minutes
30
Most information processing occurs __, out of sight of our __ mind
automaticallyconscious
Difference threshold is some constant proportion of the size of the __ __
original stimulus
Sensory adaptation enables us to focus on __ changes in our environment without being distracted by the __ constant stimulations
informativeuninformative
We perceive the world not exactly as it is, but as it is __ for us to perceive it
useful
__ spectrum ranges from short gamma rays to long radio waves
Electromagnetic
Iris changes size in response to light __ and inner __
intensityemotions
Millions of receptor cells convert light energy into __ __ in the retina that are sent to the brain and constructed there into an __ image
neural impulsesupright
In retina, generated neural signals activate __ cells that activate neighboring __ cells
bipolar ganglion
__ receives and distributes this information from the optic nerve
Thalamus
__ cells help relay __’s individual message to the visual cortex, preserves precise info, makes __ better at detecting fine detail
Bipolarconescones
rods share __ cells so individual messages get __
bipolarcombined
Special sensitivity- __: to detail and color, __: to faint light
conesrods
retina processes info before routing it via the __ to the brain’s cortex. Retina’s neural layers help to __ and __ the sensory info. Retinal areas relay info to part of the __ lobe; retinal cells can be triggered by __
thalamusencodeanalyzeoccipitalpressure
For biologically important objects and events, brains have cells that respond to __ stimulus but not to __
oneothers
Perception combines sensory input with our __ and __
assumptions and expectations
Damage to the rear of both sides of the brain can cause a person to not detect __
movement
Two visual systems: one gives us __ perceptions and one guides our __
consciousactions
About 1 in __ people have vision color deficiency, usually males because it is __ __
50sex-linked
Color deficient people lack functioning __ or __ sensitive cones, or both
red or green
Color processing occurs in two stages: 1) retina’s red, blue, green __ respond to different color __ 2) signals are processed by __ __ cell en route to the visual cortex
conesstimuliopponent-process
We perceive objects not in isolation but in their __ context
environmental
Hear best w/ frequencies corresponding to __ __
human voices
Hear by both __ and __ conduction; hearing is a special form of __ __
airbonetouch sensation
Ears transform vibrating air into __ __, which the brain decodes as __
nerve impulsessounds
Strength, or amplitude, of sound waves determines the __
loudness
__ waves: low frequency and low pitch, __ color; __ waves: high frequency and high pitch, __ color
LongRedShortBlue
__ __ movement triggers impulses in adjacent nerve fibers, converge to form __ __; send neural messages via the __ to the __ __’s auditory cortex
Hair cell auditory nervethalamustemporal lobe
__ __ are delicate and fragile; interprets loudness from __ of activated hair cellsHard-of-hearing people prefer __ sounds (hard-to-hear sounds more __)
Hair cellsnumbercompressedamplified
Brief exposure to extremely intense sounds or prolonged exposure to intense sounds can damage __ cells and __ nerves
receptorauditory
Ringing of the ears alerts us to possible __ __ (equivalent to bleeding)
hearing loss
Noise is stressful when __ or __
unanticipated or uncontrollable