Source Paper
Development of orientation selectivity in ferret visual cortex and effects of deprivation
B Chapman, MP Stryker
Journal of Neuroscience • 1993
Bilateral Lid Suture Visual Deprivation
Objective: To assess the effects of visual deprivation via bilateral lid suture on the development of orientation selectivity in ferret primary visual cortex during normal development
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Equipment2
Materials2
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Protocol Steps
Baseline recording of visual responses
Record visual responses from cells in ferret primary visual cortex starting at postnatal day 23, the age when visual responses were first recorded
Note: This establishes baseline orientation selectivity before any interventions
View evidence from paper
“from the age when visual responses were first recorded (postnatal day 23) through postnatal week 5”
Bilateral lid suture for visual deprivation
Perform bilateral lid suture to deprive animals of visual input
Note: This is the visual deprivation condition being tested
View evidence from paper
“Visual deprivation by bilateral lid suture impaired but did not completely block the normal development of orientation selectivity”
TTX infusion into visual cortex
Infuse TTX into visual cortex to silence neuronal activity as a control condition
Note: This condition completely blocks maturation of orientation selectivity, serving as a control for activity-dependent development
View evidence from paper
“Infusion of TTX into visual cortex to silence neuronal activity completely blocked the maturation of orientation selectivity”
Recording at postnatal week 5
Record cortical responses at postnatal week 5 to assess intermediate development
Note: At this timepoint in normal animals, approximately 25% of cells showed orientation-selective responses
View evidence from paper
“In normal animals from the age when visual responses were first recorded (postnatal day 23) through postnatal week 5, only about 25% of cells showed orientation-selective responses”
Recording at postnatal week 7
Record cortical responses at postnatal week 7 to assess mature development
Note: At this timepoint in normal animals, approximately 75% of cells showed orientation-selective responses, indicating adult-like state
View evidence from paper
“By postnatal week 7, cortical responses had matured to an adult-like state, with approximately 75% of cells clearly selective for orientation”
Assess orientation selectivity across conditions
Compare orientation selectivity development between normal animals, visually deprived animals, and TTX-infused animals
Note: Determine whether visual deprivation or activity silencing affects the maturation of orientation selectivity
View evidence from paper
“The orientation selectivity of cells in ferret primary visual cortex was studied during normal development and in animals deprived of vision or of visual cortical activity”