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The ventral stream (also known as the "what pathway") leads to the temporal lobe, which is involved with object and visual identification and recognition. The dorsal stream (or, "how pathway") leads to the parietal lobe, which is involved with processing the object's spatial location relative to the viewer and with speech repetition.
The ventral stream, sometimes called the "What Pathway", is associated with form recognition and object representation. It is also associated with storage of long-term memory. The dorsal stream begins with V1, goes through Visual area V2, then to the dorsomedial area (DM/V6) and middle temporal area (MT/V5) and to the posterior parietal cortex.
The dorsal stream (green) and ventral stream (purple) are both actively involved in visual memory. Both pathways originate in the visual cortex. There is a visual cortex in each hemisphere of the brain, much of which is located in the Occipital lobe. The left hemisphere visual cortex receives signals mainly from the right visual field and the ...
This pathway spreads from the primary visual cortex dorsally to the parietal lobe. Information then feeds into the motor cortex of the frontal lobe. The second pathway, the ventral stream, processes information relating to shape, size, objects, orientation, and text. This is commonly known as the ‘what’ system.
The auditory ventral stream (AVS) connects the auditory cortex with the middle temporal gyrus and temporal pole, which in turn connects with the inferior frontal gyrus. This pathway is responsible for sound recognition, and is accordingly known as the auditory 'what' pathway. The functions of the AVS include the following.
The ventral stream, commonly referred to as the "what" stream, is involved in the recognition, identification and categorization of visual stimuli. Intraparietal sulcus (red) However, there is still much debate about the degree of specialization within these two pathways, since they are in fact heavily interconnected.
While classically it is said that signaling through the M pathway ultimately flow out of the visual cortex through the dorsal stream and signaling through the P pathway ultimately flows to the ventral stream, subsequent studies have shown that both pathways influence both streams. [3]: 236 Human visual pathway
Dual Pathway Model: Gregory Hickok and David Poeppel's model proposed what is known as the dual pathway or the dual-stream model. This model explores the perception and experience of speech stimuli. The model implies that two streams process information at the perception of speech - the ventral and dorsal stream.