TABLE 3.

Studies assessing effect modification by different health characteristics on PFC activation.

First author (Journal, year) (reference)	Clinical variables
Halliday et al. (J Clin Exp Neuropsychol., 2017) (Halliday et al., 2018)	Fallers versus non-fallers
Holtzer et al. (Brain Topogr, 2016) (Holtzer et al., 2016)	Neurological Gait Abnormalities
Osofundiya (Clin Biomech., 2016) (Osofundiya et al., 2016)	Obesity
Holtzer et al. (Eur J Neurosci, 2017) (Holtzer et al., 2017a)	Levels of perceived task-related stress
Holtzer et al. (J Gerontol A Biol Sci Med Sci., 2017) (Holtzer et al., 2017b)	Fatigue
Verghese et al. (Neurology, 2017) (Verghese et al., 2017)	Longitudinal association with falls
Holtzer et al. (Brain Cogn., 2018) (Holtzer et al., 2018a)	Diabetes
Lucas et al. (J Gerontol A Biol Sci Med Sci., 2018) (Lucas et al., 2018)	Relation with white matter integrity
Hyodo et al. (Neuroimage, 2015) (Hyodo et al., 2016)	Fitness levels
Albinet (Front Aging Neurosci., 2014) (Albinet et al., 2014)
Dupuy (Front Hum Neurosci., 2015) (Dupuy et al., 2015)