![Page 1: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/1.jpg)
Lateral view
Retinogeniculate visual pathway
Ventral view
optic nerve
optic chiasm
optic tract
LGN
optic radiation
primary visual cortex
Retinogeniculate visual pathway
verticalmeridian
horizontalmeridian
fixationpoint
blindspot
foveaoptic disc
Left eye visual field Right eye visual field
![Page 2: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/2.jpg)
Lateralization
Visual field deficits
R optic nerve damage
Puncture in lower temporal retina of right eye
Cut right optic tract
LE VF RE VF
Lateral Geniculate Nucleus (LGN)
LGN1
23
45
6
![Page 3: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/3.jpg)
Retina LGN
Parallel pathways
Midget (parvocellular)
Parasol (magnocellular)
magno
parvo
LGN retinotopic map
LGN physiology
Center-surround receptive field
+−
electrode
![Page 4: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/4.jpg)
V1
V2
V3
V4
V3a
V7
Primary visual cortex (V1)
V1 physiology: orientation selectivity
Neu
ral r
espo
nse
(spi
kes/
sec)
Stimulus orientation (deg)
V1 physiology: direction selectivity
![Page 5: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/5.jpg)
Simple cell
No stimulus in receptive field, no response
Non-preferred stimulus, no response
Orientation selectivity theory
Preferred stimulus, large response
Simple cell sums LGN inputs
![Page 6: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/6.jpg)
Complex cell
Length summation in simple cells and complex cells
Hypercomplex cell
![Page 7: Retinogeniculate visual pathway - Center for Neural Sciencedavid/courses/perceptionAdvanced/lectureSlides/… · Retinogeniculate visual pathway Ventral view optic nerve optic chiasm](https://reader033.vdocuments.mx/reader033/viewer/2022060207/5f03f7a07e708231d40ba84d/html5/thumbnails/7.jpg)
V1 physiology
Simple cells:• orientation selective• some are direction selective• some are disparity selective• monocular or binocular• separate ON and OFF subregions• length summation(best response to long bar)
Complex cells:• orientation selective• some are direction selective• some are disparity selective• nearly all are binocular• no separate ON and OFF subregions• length summation
Hypercomplex cells:end-stopping (best response to short bar)
Hubel & Wiesel movie