TY - RPRT TI - Sympathetic activity is influenced by task difficulty and stress perception during mental challenge in humans. AU - R Callister AU - N O Suwarno AU - D R Seals PY - 1992 DO - 10.1113/jphysiol.1992.sp019269 UR - https://pubmed.ncbi.nlm.nih.gov/1474496/ ID - 1474496 ER -