Editing Iconic memory (section)

====Neural basis====
Underlying visible persistence is neural persistence of the visual sensory pathway. A prolonged visual representation begins with activation of photoreceptors in the [[retina]].  Although activation in both [[rod cell|rods]] and [[cone cell|cones]] has been found to persist beyond the physical offset of a stimulus, the rod system persists longer than cones.<ref name = "Book">{{cite book | last1 = Irwin | first1 = David | last2 = Thomas | first2 = Laura | title = Visual Memory | chapter = Neural Basis of Sensory Memory |editor1= Steven Luck |editor2=Andrew Hollingworth | publisher = Oxford University Press | year = 2008 | location = New York, New York | pages = 32–35 | isbn = 978-0-19-530548-7}}</ref> Other cells involved in a sustained visible image include M and P [[retinal ganglion cells]]. M cells (transient cells), are active only during stimulus onset and stimulus offset.  P cells (sustained cells), show continuous activity during stimulus onset, duration, and offset.<ref name = "Book"/><ref>{{cite journal | title = Responses of cat retinal ganglion cells to brief flashes of light | journal = Journal of Physiology | year = 1970 | first = W. | last = Levick |author2=J. Zacks | volume = 206 | pages = 677–700| pmid = 5498512 | issue = 3 | pmc = 1348672| doi = 10.1113/jphysiol.1970.sp009037 }}</ref> Cortical persistence of the visual image has been found in the primary visual cortex (V1) in the [[occipital lobe]] which is responsible for processing visual information.<ref name = "Book"/><ref name = "Nikolic">{{cite journal|last=Nikolić|first=Danko |author2=S. Häusler |author3=W. Singer |author4=W. Maass|title=Distributed fading memory for stimulus properties in the primary visual cortex|journal=PLOS Biology|year=2009|volume=7|doi=10.1371/journal.pbio.1000260|editor1-last=Victor|editor1-first=Jonathan D.|issue=12|pages=e1000260|pmid=20027205|pmc=2785877 |doi-access=free }}</ref>