“in the name of god”
DESCRIPTION
“In The Name of God”. Visual Pathway. Ventral & Dorsal. Presented by: Yoosef Najian. Cones Rods. Parvocells (P cells) Magnocells (M cells). Question ?. Sensitivity. Stimulus featureM cellsP cells Color Contrast Luminance contrast Spatial Frequency Temporal Frequency. NOYes. - PowerPoint PPT PresentationTRANSCRIPT
“In The Name of God”
Ventral & Dorsal
Presented by: Yoosef Najian
Visual Pathway
• Cones
• Rods
Parvocells (P cells)
Magnocells (M cells)
Question ?
• Stimulus feature M cells P cells
– Color Contrast
– Luminance contrast
– Spatial Frequency
– Temporal Frequency
• Sensitivity
NO Yes
Higher Lower
Lower Higher
Higher Lower
Inferior Retina
Superior Retina
Upper visual Field
Lower visual Field
Inferior V1
Superior V1
• Layers of the Cortex– I : Molecular Layer– II : External Granule Cell Layer– III : External Pyramidal Cell Layer– IV : Internal Granule Cell Layer– V : Internal Pyramidal Cell Layer– VI : Multiform Layer
What System = Parvocellular Pathway = P Pathway = Ventral Pathway =
Temporal Pathway
Where System = Magnocellular Pathway = M Pathway = Dorsal Pathway =
Parietal Pathway
Organization of Visual Areas in Macaque and Human Cerebral
Cortex
David C. Van Essen
In: Visual Neurosciences (L. Chalupa and J. Werner, eds.)
visual (blue , 52%)somatosensory (green, 10%)auditory (red, 3%)motor (magenta, 8%)olfactory (brown, 1%)Unassigned cortex (gray, 25%) is mostly cognitive or emotional in function
How can we identify distinct visual areas?
– Architecture– Connectivity– Visual Topography– Functional
Characteristics
Sulci :
• STS: Superior temporal sulcus
• AMTS: Anterior middle temporal sulcus
• PMTS: Posterior middle temporal sulcus
• OTS: Occipitotemporal sulcus
• RS: Rhinal sulcus• IOS: Inferior occipital
sulcus• LS: Latral sulcus
Areas:
• TEOd ~ PITd
• TEOv ~ PITv
• TEpd ~ CITd
• TEpv ~ CITv
• TEad ~ AITd
• TEav ~ AITv
Keiji Tanaka
• TEOd
• TEpd
• TEad
• TEOv • TEpv • TEav
Kadharbatcha S. SaleemKeiji TanakaKathleen S. RocklandK. ChengW. SuzukiT. HashikawaWebster MJBachevalier JUngerleider LG
Overall Distribution of Labeled Terminals(1)
Single Axon Reconstruction(1)
Single Axon Reconstruction(2)
Single Axon Reconstruction(3)
Conclusion:LIPd
LIPv
LOPV3A
Parietal AreasPrefrontal Areas
8 45
12
1113
The Ventral Visual Object Pathway in Humans : Evidence from fMRI
Nancy Kanwisher
