This work has as objective the development of an integrated system that merely allows the behaviour of the electric brain activity in cognitive and emotional processes, using technics as Event-Related Potentials (ERP). The system has two components (standardised equipment) which work in a synchronised framework, allowing develop several types of research in the Cognitive Neuroscience area. The first component allows to develop any protocol, whether visual, auditory or mixed, throughout the Presentation® software. The second one consists of a computational tool software named SIPRES Analyzer, which allows analysing the behaviour of resulting electrical brain activity, according to stimulation. Finally, the system performance is measured through a pilot test with a sample of 30 adults over 60 years of age, whit and without Mild Cognitive Impairment (MCI), to whom are presented two stimulation protocols developed in this project. With the protocol based on the oddball paradigm, is possible to evaluate attention and memory, while in the emotional protocol are discriminated the differences among facial expressions of happiness, sadness and neutrality, through the electrical brain activity analysis. Whit the system is possible to establish a correspondence between the stimulation protocols and the electrophysiological recordings. In cognitive processes, the N100, N200 and P300 waves are relevant, mainly a significant delay in the latency in subjects with MCI in comparison with the normal ones. On the other hand, in emotional processes were identified components as N170, EPN, N300 and LPP which are not affected by the impairment of cognitive functions.