In both humans and monkeys, visual WM seems largely independent between the left and right visual hemifields, which project to the right and left cerebral hemispheres, respectively. WM has a very limited storage capacity (Luck and Vogel, 1997, 2013). But the capacity within one visual hemifield is largely unaffected by the number of objects in the other hemifield (Buschman et al., 2011; Delvenne, 2005; Umemoto et al., 2010). Correspondingly, the neural correlates of WM storage and WM load (how many items are held in memory) primarily reflect items within the contralateral hemifield (Funahashi et al., 1990; Kastner et al., 2007; Kornblith et al., 2015; Luria et al., 2016; Rainer et al., 1998).
