Every time you retrieve a memory of an event, it will become more flawed and less correct. When you retrieve a memory, it gets influenced with newer thought and emotion. So the memory might no longer be same as before. The cerebral cortex (grey matter) has different areas with different functions. Frontal lobe: this part is responsible for our cognitive functions, emotional expressions, abstract thinking, our spoken language, planning, executive functions, our self-image (ego) and even most likely our consciousness. Parietal lobe: This part processes the sensory information it receives from all over the body. Occipital lobe: Responsible for visual processing. Temporal lobe: Sound and the auditory language is processed here. The cerebellum is controlling the motor functions of our body.