COG visual perception

ch 6

sensation

transferring info about environment to brain

raw info coming in from the environment

transduction

physical energy is transferred into neural signals

sensory receptors are triggered

perception

Integrating and interpreting info coming from senses

taste buds are activated but one person loves it and one hates it

Some people see blue vs. dark purple

physical energy

light

sensory organ

eye

receptors

rods- presence or absence of light - 120 million

cones- color: 6-8 million

photo receptors in retina

rods and cones are located in fovea

visual pathway

through pupil to retina to trigger rods and cones→bipolar cells→ganglion cells→ optic nerve (axons of ganglion cells)

visual pathway continued

optic nerve→optic chiasm (meeting spot X)→thalamus (process)→ occipital lobe→ forward in brain

parvocellular pathway

what

identification of item

occipital up to parietal to temporal

magnocellular pathway

where

location/spatial

occipital up to parietal

ipsilateral

stays same

contralateral

crosses over in chiasm

parallel processing

simultaneous processing of two different types of info from same input/stimulus

top down processing

AHA

memory guides perception

previous experiences influence perception

bottom up processing

when external stimulus drives perception

saccades

Eyes move in little jerky movements. staccato

while reading

fixation

saccades are separated by brief pauses

this is where you bring in visual information

change blindness

failure to notice changes if they happen during saccade

can only see change if you are fixated on the change

attention must be interruptible

attention can be drawn away from one thing to another

want attention to be broken if needed

inattentional blindness

fail to see an object even when you are looking at it head on bc attention is directed elsewhere

so locked in, you fail to see change in object