Auditory Evoked Potential of Late Latency and Cognitive (P3) in Aphasic Individuals
Introduction: The Long Latency Auditory Evoked Potentials (LLAEP) depicts the cortical electrophysiological activity involved in attention, discrimination, memory, integration, and decision-making skill. Several authors have described the importance of the use of LLAEP and P3 in individual with (central) auditory processing. However, there are still few researches to establish the relationship between the findings obtained in LLAEP and P3 in aphasic individuals.
Objective: To analyze the findings of the LLAEP and cognitive potential in aphasic individuals.
Methods: All the individuals were submitted to the auditory evoked potential of late latency and cognitive (P3). The LLAEP findings were compared and the time of occurrence of stroke, age, and education were correlated.
Results: A sample of 12 aphasic individuals, in the ages between 49 and 72, was used. It was found out that the latency waves N1 and P2 were significantly increased by the left-ear stimulation. There has been a significant association between age and latency of N1 and amplitude of P1N1 when the right ear was stimulated. Seven individuals got absent results for P3. The individuals who presented the P3 had average latency of 369.7 ms and average amplitude of 8.6 µV.
Conclusion: We verified superior values of latency and amplitudes when the stimulation was held in the left ear, although there was a significant statistical difference between amplitude of P1N1 and latency of P2. A statistical correlation between age and latency of N1 and amplitude P1N1 with the left ear's stimulation was observed. It verified a correlation between age and latency of P3.