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You have a test next week!

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Presentation on theme: "You have a test next week!"— Presentation transcript:

1 You have a test next week!
Review Session Monday next week 4 – 5 Room Th 173

2 Parallel pathways in the visual system

3 Dorsal and Ventral Pathways
recall some details about visual pathways

4 Dorsal and Ventral Pathways
Different visual cortex regions contain cells with different tuning properties represent different features in the visual field PET study by Zeki et al. Double dissociation of lesions V5/MT is selectively responsive to motion V4 is selectively responsive to color

5 What are the different roles of these pathways?
Ventral Stream Object identification Awareness? Dorsal stream Spatial representations

6 Dorsal and Ventral Pathways
V4 and V5 are key parts of two larger functional pathways: Dorsal or “Where” pathway Ventral or “What” pathway Ungerleider and Mishkin (1982) Magno and Parvo dichotomy arose at the retina and gives rise to two distinct cortical pathways

7 Fusiform Gyrus: Specialized for perception of complex objects
Ventral pathway has specialized regions for complex object identification: Faces – Fusiform Face Area (FFA) Word Form – Visual Word Form Area (VWFA)

8 Visual Word Form Area fMRI contrasting words with pictures
Left inferior temporal lobe Deheane et al. (2009) NeuroImage

9 Visual Word Form Area Exhibits invariance to surface structure of words Table, TABLE, tAblE are equivalent Deheane et al. (2009) NeuroImage

10 Visual Word Form Area Possibly mediates the critical skill of overcoming mirror invariance for objects during learning Deheane et al. (2009) NeuroImage

11 Visual Word Form Area Lesions cause Pure Alexia
Inability to read visual input efficiently Letter-by-letter strategies are intact but S – L – O – W Words traced on the skin can be read!? Deheane et al. (2009) NeuroImage


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