In recent years, our research group on Language Processing, GEPL, has been collaborating with Centro Neurosensorial de Braga, led by Dr. Ana Paula Azevedo. In this context, some serious games were developed and installed for recognizing shapes, emotions and training central and peripheral vision. They are used in memory therapy, deconcentration, dyslexia, and other problems that affect the acquisition of knowledge in learning processes.The ideas that rose up along the literature review done on those areas, will be exposed along the state-of-the-art chapter in this report. This thesis proposes a system that will implement an error detection algorithm based on speech-to-text analysis to check whether the spoken sequence contains errors or not. As the system is intended to be installed in the Neurosensory Center, the results will be presented visually to help the therapist in their day-to-day work and monitor the actual use of the system.