Lecture 9 - Perception Flashcards
(21 cards)
why do we see illusions
our brain is making sense of the world
perceptual process
analysis
synthesis
perception
what is a signal
something that is generated and travels to a sense organ and which innovates the sense organ
what is a modality
a mode of perceptual processing, such as hearing and touch. when there are more than 2 it is referred to multimodal perception
what is sound
compression of air molecules, when you remove the medium they travel though (air) the sounds stops
sine waves
sounds like a whistle
complex waves
everything else
sensation
what happens at the sense organ
perception
involves thinking, the brain, experience, opinion and emotion
are sensation and perception the same?
no, they are different
sensory threshold
the weakest stimulus an organ can detect
absolute threshold
the lowest level at which a stimulus can be detected
recognition threshold
lowest level at which a stimulus can be detected and recognised
termination threshold
the level beyond which a stimulus is no longer detected
sensory adaptation
our senses no longer perceive a stimulus because of our sensory receptors continuous contact with it
photoreceptor cells
allow for primary processing of visible wavelengths
what wavelengths can humans see
400-750 nanometers
transduction
the process of changing light into neural signals managed by a protein called rhodopsin in the rods
what is the core pathway for vision
retina
geniculate nuclei
primary visual cortex (striate cortex)
auditory pathway
no major pathway - network of pathways instead
where do axons of the auditory pathway synapse
cochlear nuclei, they then proceed to the primary auditory cortex (transverse temporal gyri, or herchl’s gyri
