Sensations Flashcards
What are receptor cells and where are they situated?
1- cells that recept and transfer information
2- in sensory organs such as eyes or ears
What stimulates receptor cells?
physical energy (light waves or sound waves) molecules (taste/smells)
The brain cannot process raw data, so what do receptor cells do? give the right terminology and explain
transduction
transforms signals in action potentials
Vision:
transduction is accomplished by transforming _____ into action potential. 2 types of receptor cells are stimulated, what are their group name and individual name?
light waves
photoreceptors
rods and cones
Rods: what kind of light, what kind of shades
dim light (night vision) shades of grey
Cones: what kind of light, what kind of shades
adequate light
colours
Which one of the two photoreceptors offers the best vision?
cones
What is the absolute threshold? %
smallest detectable intensity.
50% of the time people detect it.
What causes colorblindness?
cones disfunction
What is positive sensory adaptation? example
how we can adapt to our environment and be more sensitive to hard-to-detect stimulus.
Like dark-adapted with pupils
What is negative sensory adaptation? What causes it?
exposed constant stimulus, less senstitive.
cells fire action potential constantly. Fatigue. slow down their right.
What is the difference threshold and JND (what do letter mean)
smallest detectable change in the intensity that people detect 50% of the time
Just noticeable difference.
What is the Weber’s Law?
change works with %, not in #.
higher intensity background, higher the change
What is the difference between perception and sensation?
Perception is organized depending on inner interpretation. It is not automatic as sensations are.
