The main objective of this lecture is to center around illustrating a comprehensive understanding of established theories within the realm of cognitive psychology for the learners. The aim is to empower students with the capacity to not only grasp but also appreciate the intricacies inherent in cognitive processes. 

Furthermore, this lecture endeavors to foster a profound comprehension of the various research methods employed in the field of cognitive psychology. By delving into these well-established theories and research methodologies, the goal is to equip students with the analytical tools and cognitive frameworks necessary for a nuanced exploration of the workings of the human mind. 

This approach aims not just at surface-level knowledge but at cultivating a deeper and more meaningful understanding of the theoretical underpinnings and empirical investigations within cognitive psychology.