In 1896 he published his second major work, entitled "Matter and Memory". This rather difficult work investigates the function of the brain and undertakes an analysis of perception and memory, leading up to a careful consideration of the problems of the relation of body and mind. Bergson had spent years of research in preparation for each of his three large works. This is especially obvious in "Matter and Memory", where he showed a thorough acquaintance with the extensive pathological investigations which had been carried out during the period.