Books on Neurological functions?
Any basic Neuroscience book would suffice, really. For example, a really good and widely used book is  

Principles of Neural Science from Kandel et al. I read it nearly from cover to cover, and it details the workings of the nervous system from bottom to top. Parts IV to IX are probably most relevant to you:


Part IV: The Neural Basis of Cognition
Part V: Perception
Part VI: Movement
Part VII: The Unconscious and Conscious Processing of Neural Information
Part VIII: Development and the Emergence of Behavior
Part IX: Language, Thought, Affect, and Learning