You are in a nice museum and in your right visual field you spot a beautiful pai

Question

You are in a nice museum and in your right visual field you spot a beautiful painting (this painting is very colorful and full of detail). For some reason it is international talk like a pirate day (September 19) and you are wearing an eye patch that covers your RIGHT eye. Based on what you know about the cells of the retina and the retinogeniculostriate tract… answer the following questions: a. What types of photoreceptor cells are critical in processing this information? Why? b. What type of retinal cells are critical in transmitting this information? Why? c. Which thalamic nucleus will process this information and what layers specifically will process the paintings information? (think about how I described the painting). d. In order to tell someone what you are seeing, what visual stream will be used?

(its a physiological psychology question )

Explanation / Answer

1. The two types of photoreceptor cells are rods and cones. Rods are able to work in low light compared to chromatic light. But cones are sensitive to bright illuminated chromatic light. These two cells contribute to the vision at different light energy levels.

2. Retinal ganglion cells are involved in transmitting the information from photoreceptor cells. The photoreceptor cells synapse with the bipolar and horizontal cells in the outerplexiform layer. Bipolar cells synapse with Retinal ganglion cells. The optic disc which is madeup of retinal ganglion cells exit the retina . So the light travels along photoreceptor cells, bipolar cells and exit at retinal ganglion cells.

3. The Retinal ganglion cells deliver the information to lateral geniticulate nucleus of the thalamus.

4. Millions of rods and cones transmit the information to millions of bipolar cells which inturn transmit to retinal ganglion cells and finally to thalamus. Such that the brain will receive what information is perceived. Visual stream is responsible for representing what type of image is seen.

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