Ch 4 P1 Flashcards
What is the Visual Pathway to the Brain?
Retina ->
Optic Nerve ->
Optic Chiasm ->
Lateral Geniculate Nucleus (LGN) - thalamus ->
FEEDBACK <->
Occipital lobe
Occipital lobe consists of visual receiving area including the
Area V1 & Striate Cortex
Lateral Geniculate Nucleus (LGN) is also known as the
Thalamus
The Optic Chiasm is where
Electrical signals can crisscross
The Lateral Geniculate Nucleus receives
90% of light info from the optic nerve
The Lateral Geniculate Nucleus ALSO receives
10% of light info that goes to the superior colliculus (controls eye movement)
(looks like butt cheeks)
The Lateral Geniculate Nucleus (LGN)
receives info from both retina and striate context
(the LGN receives feedback from the striate context)
The Striate Cortex is also known as
The visual receiving area, primary visual cortex, or area V1
What happens in the Striate Cortex?
Visual info from receptive fields continues to be processed in this area
What happens in the Striate Cortex?
Visual info from receptive fields continues to be processed in this area
What is not organized as center-surround like retina and LGN?
Receptive Feilds
What do neurons in the Striate Cortex have?
side-by-side receptive fields called simple cortical cells (feature detectors)
Exposure to a certain feature for a SHORT PERIOD of time DECRESES firing in the cortical neurons for that feature is called
Selective Adaption
Why do neurons decrease in firing?
Adaption and Short-term
What takes getting used to a specific feature?
Where firing fades for a feature that is presented repeatedly for a short while?
Adaption
What occurs for a few minutes but goes away?
Short-term
What causes a difference in light intensity?
Contrast threshold
Exposure to a certain feature for a long period of time increasces firing in the cortical neurons
Selective Rearing
Why do neurons increase firing?
Neural Plasticity / Experience-Dependent Plasticity
What neurons can be shaped to respond in a certain way?
Neural Plasticity / Experience-Dependent Plasticity
What is the reason neurons continue to actively respond to orientation for weeks and days?
Long-term effect
How is it that the environment stimulus is processed in specific locations of the brain
Spatial = location - left, right, up, down
Spatial Organization
Spatial =
location - left, right, up, down
What is represented spatially in the striate cortex through electrical signal?
Image of stimulus
