In many discussions about productivity and functioning, tasks are treated as simple units of action.
You either do the thing, or you don’t do the thing.
For many neurodivergent people, the central difficulty is not the task itself. It is the energetic conditions required to begin.
In a recent group discussion about energy use and overload, we talked about how some people can simply get up and do something — even something effortful or unpleasant — while others struggle to initiate even preferred or meaningful activities.
To describe this difference, we developed two connected ways of understanding task engagement:
the Anticipatory Momentum Model and what one client memorably called the "Snow Boulder" Model of Task Engagement.
Together, they describe what happens when beginning requires momentum that has not yet had time — or conditions — to form.
For some nervous systems, tasks do not begin with step one. They begin with simulation.
For example, a client recently described how, before starting something as straightforward as doing laundry, she would mentally map the entire chain of events that might follow:
By the time she reached this point, she was already overwhelmed. The task had not begun.
But the energetic cost had already been paid — through anticipation.
The Anticipatory Momentum Model helps explain this experience. It proposes that task initiation depends not only on effort or willingness, but on how much momentum must accumulate in advance for beginning to feel survivable.
For these types of difficulties, conventional wisdom often encourages people to break large tasks into smaller steps.
For some individuals, this creates a snowball effect — small successes generate forward movement.
For others, this metaphor does not fit. One client described her experience differently:
“It’s not a snowball that needs to get rolling.
It’s a snow boulder that already exists.
You can see the individual snowballs that make it up.
But taking one away doesn’t change the size of the boulder.”
Completing one micro-task may not reduce the perceived magnitude of what remains. Instead, it can make the overall demand more visible.
Rather than producing relief, this can intensify:
In the Snow Boulder Model, initiation difficulty is not about building momentum after movement begins.
It is about the absence of sufficient pre-momentum to move something that already feels massive.
People who struggle to start tasks are often told they are catastrophizing about how long something will take or how difficult it will be. Sometimes this is true.
But sometimes the nervous system is making a realistic prediction.
For this client, laundry often did take most of the day. This process did require significant energy and did result in overload.
Her brain was not inventing the problem. It was forecasting based on prior energetic outcomes.
The Anticipatory Momentum Model highlights an important clinical distinction:
difficulty beginning a task may reflect accurate energetic forecasting rather than distorted thinking.
At one point, a change in regulatory conditions allowed this client to begin tasks more easily.
What changed was not simply the amount of effort she could exert.
It was how energy became available across time.
She no longer felt required to mentally commit to the entire task sequence before starting.
She could think about step one and simply begin.
Equally significant was a realization that felt entirely new:
She could stop.
Tasks were no longer all-or-nothing contracts that captured her once initiated. They became adjustable engagements.
This reduced anticipatory dread, emotional conflict, and the exhausting internal negotiation of:
The shift made visible, but did not create the underlying dynamics of initiation and overload.
In many models of behavior change, momentum is understood as something that appears after action begins.
But for some people, a certain level of momentum must exist before beginning is possible.
Without sufficient anticipatory momentum, tasks feel immovable — not because the person lacks motivation, but because the energetic and emotional conditions required for engagement are not yet in place.
In this manner, what appears to be procrastination may be an attempt to prevent overload, what appears to be avoidance may be a timing problem, and what appears to be anxiety may be a realistic projection of future cost.
Viewing task initiation through the Anticipatory Momentum Model and the Snow Boulder framework invites a shift in how difficulty starting is interpreted and supported.
First, it challenges moral or motivational explanations. A person who cannot begin may not need more discipline or accountability. They may need different energetic conditions.
Second, it suggests that common strategies fail when they do not reduce anticipatory load.
Breaking tasks into smaller steps, encouraging positive thinking, or increasing external pressure may not help if the underlying requirement for pre-momentum remains unchanged.
Support becomes more effective when it focuses on:
Most importantly, this perspective reframes capacity.
A person who can begin is not necessarily more motivated. They may simply be less captive to anticipation.
Sometimes the problem is not that a person cannot make themselves start. It is that beginning requires energy they do not yet have.
"*" indicates required fields
