Test 2 Flashcards
Sensation
transmitting sensory data from the environment to the brain; biological process
Perception
interpreting sensory data into usable mental representations of the world; psychological process`
Smell Stimulus and Receptors
molecule dissolved in fluid on the mucous membranes in the nose; sensitive ends of olfactory neurons in the olfactory epitheleum in the nose
Taste Stimulus and Receptors
Molecule dissolved in fluid on the tongue; taste cells in taste buds on the tongue
Touch Stimulus and Receptors
Pressure on the slain; Sensitive ends of touch neurons in skin
Pain Stimulus and Receptors
Wide variety of potentially harmful stimuli; sensitive ends of pain neurons in skin and other tissues
Hearing Stimulus and Receptors
Sound waves; pressure-sensitive hair cells in cochlea of inner ear
Vision Stimulus and Receptors
Light waves; light-sensitive rods and cones in retina of eye
Transduction
receptors’ conversion of incoming sensory information to a neural signal
Quantitative Coding
intensity-> frequency of action potential
Qualitative coding
kind of energy (difference receptors respond to different energy)
sensory adaptation
decrease in response of sensory system to continuous stimulation
Absolute threshold
faintest detectable stimulus of any type; typically defined as minimum amount of stimulation needed to detect stimulus 50% of the time
cross-adaptation
adaptation to one substance can affect the sensory experience of another
difference threshold/just noticeable difference
smallest difference needed in order to differentiate the stimuli
Bottom-up processing
building up to perceptual experience from individual pieces
Top-down processing
experience influencing the perception of stimuli
synesthesia
cross-activation between different areas of the brain; sensory stimulation in one modality induces a sensation in a different modality
Pathway to the eye
- Light is gathered and focused through the cornea, a transparent tissue that covers the front of the eyeball
- Muscles in the iris give it the ability to increase or decrease the diameter of the pupil, which is what allows more or less light to enter the eye
- Light bands (called accommodation) as it passes through the curved interior lens of the eye, located behind the iris. The lens is responsible for fine-tuning the focus started by the cornea
- The refracted light hits the back of the eye, where the retina is located. The retina is a network of neurons extending over most of the back of the interior of the eye, and it’s where the receptor cells for vision are
What do photoreceptor cells permit?
Transduction
Photopigment in rods
Rhodopsin
Photopigment in cones
blue, green, red
additive color mixing
when you mix two or more colored lights, you are adding more wavelengths that are perceived
Three primaries law
3 cones each sense waves from a different part of the color spectrum; trichromatic society