Chapter 4 Part 2 Flashcards
What is part of the ventral pathway?
LGN—V1—V2—V4—Inferotemporal cortex
What is part of the dorsal pathway?
LGN—-V1—-V2—-MT— parietal cortex
How many layers of neurons does the LGN consist of?
6 with 3 different cell types
What are the names of the different layers?
Layers 1-2: Magnocellular
Layers 3-6: Parvocellular
In between: Koniocellular
What types of retinal ganglion cells do these layers receive info from?
Parasol RGC-Magnocellular Layer-Motion
Midget RGC-Parvocellular-Colour and form
Bistratified RGC-Koniocellular- Colour.
What is area V4 in the visual cortex?
Responds to colour and curvature
What happens when you receive damage to the V4 area?
Achromatopsia-Cortical colour blindness. Nothing wrong with receptors, just can’t perceive colour.
What is the inferotemporal cortex?
Lower region of temporal lobe, object-selective region of cortex. Certain neurons respond best to certain objects.
What is the fusiform gyrus area? (inferotemporal cortex)
Responds specifically to faces
What is the Parahippocampal place area? (inferotemporal cortex?)
Neurons here respond selectively to spaces. Doesn’t matter if indoor, outdoor, manmade, lots of objects, few objects.
What is the extrastriate body area?
Neurons here respond best to bodies and body parts.
What is area MT?
Middle temporal area, sometimes called V5. Neurons in this area respond selectively to motion and have a preferred direction of motion. Is also tuned to speed of motions
What happens if area MT is damaged?
Impaired motion detection (akinetopsia). The whole world is seen like strobe lights are flashing
What is the intraparietal sulcus and the 3 parts?
Involved in visually guided action, there is the lateral area, the medial region, and the anterior region
What are the 3 parts of the intraparietal sulcus involved in?
Lateral area- Eye movements and attention shifts
Medial Region-Visually guided reaching
Anterior Region-Visually guided grasping
Anterior and medial work together.
