 Despite skepticism from other investigators, O'Keefe and his co-workers, especially Lynn Nadel, continued to investigate this question, in a line of work that eventually led to their very influential 1978 book "The Hippocampus as a Cognitive Map".There is now almost universal agreement that hippocampal function plays an important role in spatial coding, but the details are widely debated.Later research has focused on trying to bridge the disconnect between the two main views of hippocampal function as being split between memory and spatial cognition.