Mechanisms of Perception: Hearing, Touch, Smell, Taste and Attention - Somatosensory System: Touch and Pain

6 important questions on Mechanisms of Perception: Hearing, Touch, Smell, Taste and Attention - Somatosensory System: Touch and Pain

What are the two largest and most thoroughly studied visual pathways?

1. Retina-geniculate-striate pathways: conduct signals from each retina to the primary visual cortex

2. Retina-geniculate-striate pathways: conduct signals from each to retina to the striate cortex via the lateral geniculate nuclei

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How do the signals of the left visual field reach the right primary cortex?

 

1. From the right eye: Ipsilaterally from the temporal hemiretina.

2. From the left eye: Contralaterally (via optic chiasm) from the nasal hemiretina.

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How are the lateral geniculate  nuclei composed?

They consist of 6 layers each. 

All 6 of the layers of both LGN receive information from all parts of the contralateral visual field  of one eye.

This means; three layers receive input from one eye, and the other three layers receive input from the other eye.

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Where are most neurons that project to the primary visual cortex located?

Cortical layer IV; this produces a nice stripe pattern, when viewed in cross section, hence the name; Striate Cortex. THIS IS NOT PART OF THE LGN

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What is an retinotopic organization?

This means that each level of the system is organized like a map of the retina. This occurs in the retina-geniculate-striate system.

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How is the fovea proportioned?

Disproportioned, the fovea is relatively small, but about 25%  of the primary visual cortex is dedicated to analysizing the input of the fovea.

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