Final answer:
The question is related to Neuroscience, a branch of Biology that deals with Sensation and Perception, focusing on how organisms process sensory information such as visual stimuli. Therefore, the correct option is A.
Step-by-step explanation:
The question 'On the relation between receptive field structure and stimulus selectivity in the tree shrew primary visual cortex' pertains to the field of Neuroscience research, which is a subdiscipline of Biology, particularly concerning Sensation and Perception. This field of study focuses on how sensory systems, such as the visual system, process environmental stimuli into electrochemical signals in the nervous system.
For instance, free nerve endings are sensory receptor neurons with dendrites, responsive to various stimuli, that exist in connective tissues like the skin's dermis. Additionally, the frontal eye fields are an area of the prefrontal cortex involved in eye movements necessary for attending to visual stimuli, which is critical in understanding the processing of visual information in the brain. Understanding the structure of receptive fields and how they relate to stimulus selectivity is key to unraveling the complexities of sensory processing in organisms.