The Intensity Of Ventral And Dorsal Streams

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When someone looks at a picture, feedforward circuit conveys information to trigger lower visual region, which is V1, and then travels to higher visual regions through the dorsal and ventral streams. The brain areas are activated not at the same time, but instead it spreads out from V1. The velocity of ventral and dorsal streams is different; the dorsal stream is much faster. Feedforward is involved in pre-attentive and preconscious vision, whereas recurrent connection is involved in attentive and conscious vision. Since the attention binds all features of a specific object, it needs longer latencies for this process by using recurrent connections (Lamme & Roelfsema, 2000). Furthermore, there are two ways to utilize sensory information, reactive mode (feedback) and predictive mode (feedforward). In reactive mode, we do not know about the sensory input until we get it. Thus, our system reacts and uses the information as feedback. As we become better, less feedback is used, and the brain works in a predictive way. For example, in novel movements one uses the reactive way, because a lot of feedback is used, so the movement is slow and is divided into many steps. Once one figures out the movement’s requirements, feedforward allows ones to move predictably. For example, if we want to catch a ball, there are visual inputs traveling into the cortex through the two visual streams; the ventral stream, which allows us to perceive what we are looking at the time that the dorsal stream
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