The TIEQ Lab was constructed with low-VOC materials, and low levels of VOCs were confirmed by pretesting ( Table 3 ). To simulate a conventional office space with elevated VOCs, we placed VOC sources in the diffuser that supplied air to each cubicle area before the participants arrived on Day 5. We selected a target total VOC (TVOC) level of 500 μg/m 3 based on the LEED ® Indoor Air Quality Assessment credit limit, as measured using . EPA method TO-15 ( USGBC 2014 ). The diffusers were built into the floor of the TIEQ Lab, and there were no visible indicators of these sources for the participants to observe. We selected a mix of nonodoriferous sources to simulate VOC-emitting materials that are commonly found in office buildings and that covered four indoor VOC source categories including building materials [56 in 2 (360 cm 2 ) exposed edge melamine, 56 in 2 (360 cm 2 ) exposed edge particle board, 64 in 2 (415 cm 2 ) vinyl mat], adhesives [80 in 2 (520 cm 2 ) duct tape, 80 in 2 (520 cm 2 ) packing tape (exposed)], cleaning products [1 oz. (30 mL) multi-surface cleaner, 4 multi-surface wipes, 144 in 2 (930 cm 2 ) recently dry-cleaned cloth], and office supplies (4 dry erase markers, 1 open bottle of correction fluid).