Comparison of amplitude and latency of cognitive potential (P3)with high and low frequency stimuli in early and late onset blind subjects

The aim of this study was to study P3 with high and low frequency stimulus in blind subjects to study neuroplasticity. The P3 was recorded in 70 dBnHL. Comparison of results between two groups showed that there were no statistically significant differences between amplitudes and latencies of P3 with high frequency stimuli. However, in low frequency the difference between amplitudes was significant. Neuroplasticity seemed to occur in visual cortex in both groups. The activation patterns of the occipital cortex varied between these two groups and this could be demonstrated with low frequency stimuli better than with high frequency stimuli.