Evaluation of habituation to visual evoked potentials using pattern reversal among migraine individuals - a...

Background Migraine is a multifaceted chronic disease with common ocular symptoms. Habituation is the decremental response on repeated stimulations. The literature review indicates controversial results regarding habituation in migraine individuals. The present study aimed to compare the habituation response using visual evoked potential (VEP) measures among migraine and control subjects. Methods This was a cross-sectional study performed among migraine individuals attending the Department of Medicine and Neurology, of the age group of 18-30 years at Sri Manakula Vinayagar Medical College and Hospital, Puducherry. Habituation was evaluated in the two groups, control (n = 40) and migraine (n = 40), using pattern reversal VEP. The recording was done for 15-min duration and divided into four blocks of 3.8 min each. The results were compared employing Student t-test, and p < 0.05 was considered to be statistically significant. Results Our study indicates that latency N75, N145, and P100 amplitude showed significant differences between the two groups. In the right eye, on comparing the first and fourth block P100 amplitude in the migraine group, a significant increase (p < 0.001) was observed in the fourth block. Similarly, in the left eye, the control group showed a significant decrease in the fourth block (p = 0.002), whereas the migraine group showed a significant increase (p < 0.001). Conclusions The present study concludes that migraine individuals report deficient habituation, evaluated using pattern reversal VEP.