This book is my PhD Study "Age and sex differences in proprioception based on fine motor behaviour" that contributes to a synthesis of the bibliographic material reviewed from original sources written in various languages (sometimes unknown in the scientific community at international level) and to scientific research carried out at the Mira y Lopez Laboratory (UB). The main aim of this work is to show the importance of proprioceptive sense, as a basis of individual differences, for human health and life quality and represent the experimental work related to sex and age-dependent differences in human fine behaviour. When self-correction of behaviour is not possible (the person does not see the feedback of his movements), the expression reflects the intrinsic qualities of each person based both on biological or endogenous factors and adaptive behaviour learnt during his/her own experience with environmental interactions. My special gratitude to Dr. Josep Maria Tous (Director of the work), who opened the doors to my experience with the Proprioceptive Diagnostics (DP-TC), evolved within the M.K.P. of Mira y Lopez, and Dr. Alberto Maydeu (Director of the doctoral program).