View source for Top-Down Neuroscience

==Summary and Support==
*A study which analyses top-down and bottom-up attention indicates the following<ref> https://www.researchgate.net/publication/259449521_Bottom-Up_and_Top-Down_Attention</ref>:
**Given the brain’s limited capacity to process all external sensory stimuli at a given moment, the brain, based on the immediately present contingencies, depends on the cognitive process of attention in order to focus neural resources.
**The abovementioned cognitive process of attention can be divided into two separate functions as follows:
***Bottom-up attention:
****This refers to attentional guidance exclusively via external factors to stimuli which are salient on account of their inherent properties compared to the background.
***Top-down attention
****This refers to the internal direction of attention based on willful plans, current goals and prior knowledge. 
**Additionally, attention impacts the mean neuronal firing rate, the variability thereof, and its correlation throughout neurons. 
**Even though different processes facilitate the guidance of the two separate functions of attention, the frontoparietal network, which is a common neural apparatus, plays a vital role in both these functional processes of attention.

==Contributors==
Ayesh Perera
==References==