To be able to recognize, respond and act towards a person requires unconscious memory encoding and retrieval processes. Facial stimuli are processed in the fusiform gyrus (occipito-temporal brain area) and this processing is an implicit function representing a typical form of implicit memory.[29] REM sleep has been seen to be more beneficial to implicit visuospatial memory processes, rather than slow-wave sleep which is crucial for explicit memory consolidation. REM sleep is known for its visual experiences, which may often include detailed depictions of the human countenance.[29] A recognition task was used to gauge familiarity with a previously shown sequence of faces after a subsequent period of REM sleep.