processing starts at the very basic level of sensory receptors and works toward more complex levels of processing.

Bottom-up processing starts at the very basic level of sensory receptors and works toward more complex levels of processing.

Explanation:

Bottom-up sensory processing, a sensory perception process, is the entry or basic level of analysis of the senses which begins with an incoming stimulus that is detected by the sensory receptors in sensory organs and then begins the complex processing of sensory perception.

This process is initiated with a sensory data from which sensory information is integrated in the brain.  

The sensory photoreceptors of the eye present in the retina capture light as the visual data. This data is then transducted to electrical impulses and transmitted to the visual cortex in the brain, where the information in the data is processed that provides the visual experience .

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