Final answer:
The two common traits in the responses of posterior parietal neurons involve their role in sensory integration, particularly somatosensation, and in spatial coordination for body movements due to their connection with the motor cortex.
Step-by-step explanation:
The two common traits in the responses of posterior parietal neurons are related to the roles these neurons play in sensory processing and motor planning. The first trait is that posterior parietal neurons are involved in the integration of different sensory inputs, particularly pertaining to the somatosensory system which includes sensations such as touch, proprioception, pressure, pain, heat, and cold. The second common trait is that these neurons contribute to the spatial coordination of body movements. This is due to their connections to the motor cortex and their involvement in the interpretation of sensory information to help guide movement.
The posterior parietal neurons are part of a larger network that includes pathways for touch, proprioception, pain, and temperature sensations, which primarily begin with dorsal root ganglion cells. Once the information reaches the posterior parietal area, it is used in conjunction with visual information from the dorsal visual stream to create a comprehensive sensory world picture that can be used to inform motor activities, such as those initiated by the primary motor cortex.
In conclusion, posterior parietal neurons play a crucial role in sensorimotor integration, helping to process sensory information and assist in the planning and execution of movements.