Brain event-related potentials are a useful tool for investigating visual processing and action planning. This technique requires extremely accurate synchronization of stimulus delivery with recordings. The precision of the onset time of visual stimulus delivery is a major challenge when attempting to use real, three-dimensional objects as stimuli. Here, we present an innovative device, the "box for interaction with objects" (BIO), that is designed to synchronize the presentation of objects with electroencephalographic (EEG) recordings. To reach the required resolution of stimulus-onset timing, the BIO system features an interface with reflective glass and light-emitting diodes (LEDs). When the LEDs inside the BIO are turned on, the object inside becomes visible, and a synchronizing pulse is sent to the recording systems. The BIO was tested in a motivational study that focused on visual and motor event-related potentials. EEG signals were recorded during the presentation of an emotion-laden object that could be grasped and brought close to the participant's chest. BIO successfully synchronized the appearance of a three-dimensional object with EEG recordings, which would allow for an analysis of visual and motor event-related potentials in the same experiment. The BIO device, through a highquality psychophysiological approach, offers a new perspective for the study of the motivational factors that drive actions toward relevant stimuli.Keywords Device . Emotion . Movement . Event-related potentials . Stimulus onset The neural substrates of the motivational factors involved in action planning and execution are a current topic of interest. Motivation is the driving force by which we guide our behavior, and it is closely related to emotion. Although the motivation to act is often considered a core function of emotion, few studies have investigated the relationship between emotion and action planning and execution. Emotionladen pictures have been employed to modulate somatic and behavioral reactions in humans (Bradley, Codispoti, Cuthbert, & Lang, 2001;Coombes, Cauraugh, & Janelle, 2006Souza, Pereira, Vila, Oliveira, & Volchan, 2012;Facchinetti, Imbiriba, Azevedo, Vargas, & Volchan, 2006;Pereira et al., 2006). However, the aesthetic distance inherent to a pictorial stimulus creates a barrier that prevents interaction between the stimulus and the observer. The use of veritable stimuli, such as real, three-dimensional objects, has the benefit of allowing the observer access to the intrinsic and extrinsic motivational aspects that guide advantageous interactions with the stimuli.From an integrative perspective, motivation to interact with three-dimensional objects stands at the intersection of emotion and action processing. At present, methodological approaches to explore the neural substrates of this intersection are still lacking. Event-related potentials have been Electronic supplementary material The online version of this article