Page "Top-down and bottom-up design" Paragraph 23

Conversely, Psychology defines bottom-up processing as an approach wherein there is a progression from the individual elements to the whole.

According to Ramskov, one proponent of bottom-up approach, Gibson, claims that it is a process that includes visual perception that needs information available from proximal stimulus produced by the distal stimulus.

Theoretical Synthesis also claims that bottom-up processing occurs " when a stimulus is presented long and clearly enough.