BDNF and fibromyalgia: In addition, according to previous studies, its effect is likely state-dependent neuroplasticity, since the brain-derived-neurotrophic-factor (BDNF) (Sandrini et al., 2000; Santos et al., 2018) predicted the impact of tDCS on short-term memory in patients with fibromyalgia (Santos et al., 2018) and the disability due to pain after hallux valgus surgery (Yarnitsky et al., 2010).