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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step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.