Mechanisms of Perception: Hearing, Touch, Smell, Taste and Attention - Cortical Mechanisms of Vision and Conscious Awareness - Dorsal and Ventral Streams

5 important questions on Mechanisms of Perception: Hearing, Touch, Smell, Taste and Attention - Cortical Mechanisms of Vision and Conscious Awareness - Dorsal and Ventral Streams

Many pathways from the PVC to the SVC and the AVC are part of two major streams. Which are they and how do they flow?

1. Dorsal Stream: flows from the PVC to the dorsal prestriate cortex to the posterior parietal cortex.

2. Ventral Stream: flows from the PVC to the ventral prestriate cortex to the inferotemporal cortex.

What is the "where" versus "what" theory?

The theory that the dorsal stream flow conducts information about the "where" of an object, and the ventral stream conducts information about the "what" of an object. 

What is the "control of behavior" versus "conscious perception" theory? 

The theory that implies that dorsal streams carry information about behavorial interactions with objects and ventral stream mediates the consciousnes perception of objects.

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Give an argument for the "control of behavior" versus "conscious perception" theory.

An evolutionary implication: The conscious awareness of the ventral stream is the thing that distinguishes humand and their close relatives from their evolutionary ancestors.

What is the major support for "control of behavior" versus "conscious perception" theory that does not occur in the "where" versus "what" theory?

1. Some patients with bilateral lesions to the ventral stream can interact with objects that they are not consciously aware of.
2. Some patients with damage to the dorsal stream are consciously aware of certain objects but cannot interact with them.

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