INTRODUCTION: Motor imagery can be defined as a dynamic state during which a subject mentally simulates a given action. Conscious motor imagery and unconscious phase of motor planning potentially share common mechanisms. Voluntary movements, such as goal-directed reaching for an object, are those that are governed by motor programs and require planning. AIMS(S): The aim was to assess the effect of 4‑weeks of motor imagery training of reaching-to-grasp on cortical activity related to motor imagery of grasping (a book) and motor execution of grasping by dominant hand in healthy, young subjects. METHOD(S): 11 volunteers between 23 and 33 years participated in this study. There were: 2 measurement sessions (before motor imagery training (MIT) and after MIT) and 4‑weeks of kinesthetic MIT of reaching for a book (3 × a week) in the study’s protocol. During sessions 128‑EEG signal during motor imagery of grasping a book (MIG) and motor execution of grasping (MEG) by dominant hand was recorded. The analysis of EEG was made in BESA software and amplitudes of event related potential (ERP-related to motor imagery) and motor related cortical potential (MRCP-related to motor execution) from regions of motor programming and execution were obtained. The statistical analysis was made in SPSS software and for main comparison multivariate analysis of variance with repeated measures was used to assess effect between sessions, tasks and electrodes’ location with P≤0.05. RESULTS: The analysis has shown significant effect of electrodes’ location and tasks on EEG amplitude. There were no significant effect of session and interaction between factors. CONCLUSIONS: Mental training is important method to improve movements’ execution but its neural mechanisms are still unclear. Our study has shown that MIG and MEG share similar amplitude patterns in areas related to motor programming. We have observed a similar tendency to increase ERP and MRCP amplitudes as an effect of MIT.