Correlation analysis of object shape recognition from EEG and tactile signals

Touch perception can be decoded from brain signals as well as from tactile pressure signals obtained while holding objects using a sensor. The present work aims to classify object shapes from EEG signals and tactile pressure signals obtained from a capacitive tactile sensor while exploring objects of different shapes; thereby drawing a mutual relation or dependence between these two sources of haptic information in response to the same tactile stimuli. It is evident from the classification results that object-shapes can be classified efficiently from both EEG and tactile signals with mean classification accuracy of 74.21% and 97.12% respectively. Correlation analysis using various metrics show that EEG and tactile signals are non- linearly correlated and only a very small amount of non linear correlation exists. The polynomial fitting of EEG signals on tactile signals depicts that in absence of brain signals tactile signals can successfully predict the corresponding EEG signals.