Chapters 3 and 4 Flashcards
the process of receiving stimulus energies from the external environment
Sensation
the process of organizing and interpreting sensory information
Perception
The purpose of sensation and perception is?
adaptation
Photoreception is used for what sense?
vision
Mechanoreception is used for what sense?
touch
Chemoreception is used for what sense?
smell and taste
Absolute Threshold
the minimum amount of energy an organism can detect 50% of the time
Difference threshold
Degree of difference that must exist between two stimuli before difference is detected
2 things the Sclera does
Helps maintain shape of eye
Protects eye from injury
memorize parts of the eye
do it
sensitive to even dim light, but not color
function well in low illumination
humans have ≈ 120 million
Rods
respond to color
operate best under high illumination
humans have ≈ 6 million
cones
specialized neurons or nerve endings that respond to changes in the environment by converting energy from a specific stimulus into an action potential
Sensory Receptors
the ability to direct and focus cognitive activity on specific stimuli. In order to complete any cognitively planned activity, any sequenced action, or any thought one must use this
sustained attention
what is consciousness?
awareness and arousal
