Two-streams hypothesis
Two-streams hypothesis
The Two-streams hypothesis is a model proposed by Melvyn A. Goodale and A. David Milner to explain the neural processing of visual information in the brain. The hypothesis suggests that visual perception is divided into two distinct pathways or "streams": the ventral stream (also known as the "what pathway") and the dorsal stream (or the "where pathway").
Pronunciation
Two-streams hypothesis: /tuː striːmz ˌhaɪˈpɒθɪsɪs/
Etymology
The term "Two-streams hypothesis" is derived from the model's proposition of two separate pathways for visual processing. The word "hypothesis" comes from the Greek word "hypothesis" meaning "base" or "foundation", reflecting the theory's foundational role in understanding visual perception.
Ventral Stream
The ventral stream is one of the two pathways proposed by the Two-streams hypothesis. Originating in the primary visual cortex, the ventral stream travels to the inferior temporal cortex. It is responsible for object recognition and form representation, hence its nickname the "what pathway".
Dorsal Stream
The dorsal stream, on the other hand, originates in the primary visual cortex and travels to the posterior parietal cortex. It is involved in spatial awareness and movement, hence it is often referred to as the "where pathway".
Related Terms
- Visual perception: The ability to interpret the surrounding environment by processing information contained in visible light.
- Visual cortex: The part of the brain responsible for processing visual information.
- Inferior temporal cortex: A region of the brain involved in the processing of visual information and object recognition.
- Posterior parietal cortex: A region of the brain involved in the processing of spatial awareness and movement.
See Also
External links
- Medical encyclopedia article on Two-streams hypothesis
- Wikipedia's article - Two-streams hypothesis
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