Editing Visual memory (section)

==== Control condition ====
The subject's resting brain activation level is first determined in order to form a control or 'baseline' to measure from.<ref name="PET">{{cite journal |last1=Roland |first1=P. E. |last2=Gulyás |first2=Balazs |title=Visual Memory, Visual Imagery, and Visual Recognition of Large Field Patterns by the Human Brain: Functional Anatomy by Positron Emission Tomography |journal=Cerebral Cortex |date=1995 |volume=5 |issue=1 |pages=79–93 |doi=10.1093/cercor/5.1.79 |pmid=7719132 }}</ref> Subjects are blindfolded and instructed to lay motionless while simultaneously eliminating any visual imagery present in their [[mind's eye]].<ref name="PET" /> These instructions are intended to minimize the activation of brain regions involved in visual memory to form a true resting brain state.<ref name="PET" /> After the scan is complete a control has been formed which can be compared with activated regions of the brain while performing visual memory tasks.<ref name="PET" />