This theory explains that visual input is processed hierarchically.
- Theoretically, lower-level neurons would process different facial features and send them to higher-level neurons, and you would end up with "grandmother neurons," "Halle Berry neurons," etc.
    - Have individual neurons that are responsible for recognizing each visual object

Hierarchical model of vision processing

- Replaces the hierarchical model 
- Says that primary visual cortex neurons respond to specific spatial frequencies
    - Number of light-dark or light-color cycles per degree of visual space
    - A figure with double as many bars in the same visual space would have double the spatial frequency

Spatial-frequency filter model

- Hierarchical model
- Spatial-frequency filter model

University of Michigan - Ann Arbor

Simple cortical cells: 
- Respond best to an edge or line with a particular width, orientation, and location in the visual field
- Receive input from a group of LGN cells
- Respond best to a bar of light

Complex cortical cells:
- Respond best to an edge or line with a particular width and orientation anywhere within a larger area of the visual field 
- Recieve input from a group of simple cortical cells
- Respond best to a moving bar of light

Receptive fields of cortical cells

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

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