lecture 3: from lgn to cortex

What is the role of the Lateral Geniculate Nucleus (LGN)?

The LGN acts as a relay station for visual information, processing inputs from the eyes before sending them to the primary visual cortex (V1).

What types of layers does the LGN contain and what are their functions?

Layers 1 and 2 are magnocellular layers that process coarse features and motion, while layers 3 to 6 are parvocellular layers that process fine features and color.

What is represented in the right LGN?

The left visual field is represented in the right LGN and vice versa.

What types of cells are found in the LGN?

The LGN contains monocular cells that receive input from only one eye.

What is the significance of the retinotopic map in the LGN?

The LGN forms a retinotopic map that arranges visual input based on spatial location on the retina.

How does cortical magnification affect visual processing?

Cortical magnification results in more neural resources dedicated to processing areas of high acuity, such as the fovea, while sacrificing coverage of larger visual fields.

What is the functional relationship between LGN and V1?

The LGN projects to V1, where most neurons are binocular, receiving input from both eyes and maintaining a retinotopic map.

What is the role of simple cells in V1?

Simple cells in V1 have elongated receptive fields that respond best to lines, bars, and edges at specific orientations.

What are feature detectors in relation to visual processing?

Feature detectors are neurons that respond selectively to specific features of visual stimuli, like orientation and movement.

What is the concept of population coding in the context of visual perception?

Population coding refers to interpreting sensory information based on the collective output of a group of neurons, allowing for the disambiguation of stimuli.