The present experiment was aimed to study the influence of automatic change detection and attention switching processes on event related potentials associated with the preparation of voluntary movement. Participants performed self-initiated key presses with their right hand index finger simultaneously with listening to sound stimuli presented in two sequences: the oddball paradigm and the control paradigm. Participants were asked to focus on the motor task and ignore the sound stimuli. The oddball paradigm is a sequence of repetitive (standard) and deviant tones, which leads to the involuntary attention activation. The distribution analysis of the number of movements relative to the time of sound stimulus presentation showed that in the oddball paradigm, the number of pressings performed in the interval of 800–1200 ms after the stimulus was significantly greater compared to the interval of stimulus presentation (0–400 ms). When analyzing the readiness potential amplitude, a significant increase of the bilaterally symmetrical component in the interval from –300 to –600 ms before the movement was found in the oddball paradigm compared to the control paradigm. The results obtained allow us to speak about the activating effect of the processes associated with the involuntary attention system on the early components of movement preparation.