Inferior temporal gyrus

This region is one of the higher levels of the ventral stream of visual processing, associated with the representation of objects, places, faces, and colors.

[6] The IT cortex's neurological significance is not just its contribution to the processing of visual stimuli in object recognition but also has been found to be a vital area with regards to simple processing of the visual field, difficulties with perceptual tasks and spatial awareness, and the location of unique single cells that possibly explain the IT cortex's relation to memory.

This is supported by functional magnetic resonance imaging (fMRI) data collected by researchers comparing this neurological process between humans and macaques.

The Inferior Temporal Cortex receives information from the ventral stream, understandably so, as it is known to be a region essential in recognizing patterns, faces, and objects.

Early research indicated that the cellular connections of the temporal lobe to other memory associated areas of the brain – namely the hippocampus, the amygdala, the prefrontal cortex, among others.

The same study also reveals how the magnitude of the response of these single-cell neurons of the IT cortex do not change due to color and size but are only influenced by the shape.

[14] The neurons in the ITC have several unique properties that offer an explanation as to why this area is essential in recognizing patterns.

They only respond to visual stimuli and their receptive fields always include the fovea, which is one of the densest areas of the retina and is responsible for acute central vision.

Correctly being able to recognize an object is highly dependent on this organized network of brain areas that process, share, and store information.

In a study by Denys et al., functional magnetic resonance imaging (FMRI) was used to compare the processing of visual shape between humans and macaques.

This would suggest that the human brain is better evolved for a high level of functioning in a distinct, three-dimensional, visual world.

Although it is not conclusive, 'face-selective' IT cortex cells are assumed to play a large role in facial recognition in monkeys.

Rubens and Benson's 1971 study of a subject in life with prosopagnosia reveals that the patient is able to name common objects on visual presentation flawlessly, however she cannot recognize faces.

was still able to recognize common objects, subtle differences in shapes, and even age, sex, and "likeability" of faces.

[21] Certain disorders, such as Alzheimer's disease and semantic dementia, are characterized by a patient's inability to integrate semantic memories, which results in patients being unable to form new memories, lacking awareness of time period, as well as lacking other important cognitive processes.

Chan et al 2001 conducted a study that used volumetric magnetic resonance imaging to quantify the global and temporal lobe atrophy in semantic dementia and Alzheimer's disease.

Rather, atrophy in the entorhinal cortex, amygdala, and hippocampus was prominent in the Alzheimer's inflicted subjects of the study.

[22] Cerebral achromatopsia is a medical disorder characterized by the inability to perceive color and to achieve satisfactory visual acuity in high light levels.

Human right cerebral hemisphere . Lateral view (left) and medial view (right). In both images, inferior temporal gyrus labeled at bottom. The areas colored green represent temporal lobe . (Brown is occipital and purple is limbic respectively.)
The dorsal stream (green) and ventral stream (purple) originating in the primary visual cortex.
Diagram depicting different regions of the left cerebral hemisphere, fusiform in orange.
Same as above, but parahippocampal gyrus now in orange.
An example of vision in a person with cerebral achromatopsia.