On a biological level, what poor motivation looks like in the brain is a depletion of neurotransmitters in the brain reward and motivational pathways. Specifically these neurotransmitters are serotonin, dopamine and norepinephrine, and are typically triggered in the brain by two primary factors, psychotropic medication and thoughts.
Yes, thoughts are the primary and organic influences of chemicals in your brain as well as the pathways created in your brain by the electrical exchange of signals. So in short, the primary reason you struggle with poor motivation boils down to what you think. However it gets more complicated that this, as the thoughts you are conscious about are not necessarily the only thoughts you are engaged in.
Thinking in the brain happens on two levels, the first being thoughts within the sphere of your consciousness and thoughts outside of your consciousness, with the latter being more significant. Thoughts that occur in your sub consciousness are more significant because these are the thoughts we often act out upon. Exceptions would be when the behavior we are about to engage in is deemed socially inappropriate.
So you may be asking yourself, “how do thoughts get into our sphere of sub consciousness to begin with?” The answer to that question is much the same way we learned to swim, ride a bicycle or drive a car. In short, ideas and values we learned, which we then taught to the inner mind. Further, because we find ourselves engaged in other thoughts, we find that most of our core beliefs and values have been relegated to the auto pilot functions of the subconscious mind. So if you already are seasoned in riding a bicycle, the technical steps involved in the riding of the bicycle are so familiar to you that you execute them effortlessly without thinking.
When it comes to the issues with poor motivation, it more than likely that you subconsciously operate on a core set of beliefs and values you learned as a child, which have been triggered by your current circumstances. Take for example, years ago at a former job, I began noticing that some of the employees where no longer taking their tasks and duties seriously. When on the job they seemed to move deliberately slowly, further there are on uptick in people not showing up to work and calling in sick.
In a team management meeting, we readily acknowledged that something was wrong, but none of us could accurately identify why morale among the employees seemed to have taken a hit. Until one day it was revealed that someone had anonymously or accidentally, left a list of all the employees and their salaries on the photocopying machine in the main office. It also turned out that another person had taken the liberty to make copies of the salary list and distribute among staff.
That was the answer, the employees whom had suddenly began demonstrating a disinterest in the job, also happened to be some of the lower earners on the list. They were clearly no longer happy about what they were making, once they learned about what some of their coworkers in similar positions where making compared to them. It became easy for me to conclude that they probably felt taken advantaged of, and this line of thought most likely triggered a belief system that caused a decrease in their motivation to come to work. I also did find it interesting that there where other workers whom were among the lower to the lowest paid and even though they learned about what they were earning relative to others, their levels of motivation did not decrease.
So your struggle with low motivation boils down to what you believe about your situation. Do you feel like you are wasting your time? Do you feel you are competent and good at what you are supposed to be doing? Do you feel the playing field is fair? Or, do you feel overwhelmed by the amount of work you believe you have to do, and have concluded that it can’t be done?
Regardless, asking yourself these questions will begin the process of challenging your perception about your situation which will hopefully lead you to accurate answers. Which will no doubt restore within you, healthy levels of motivation. This being written, the process can be complicated and depending on how severe your issues with poor motivation are, you will likely benefit from the services of a therapist.