A Day With Too Many First Tasks
Starting new tasks depletes cognitive resources more than continuing existing ones, contributing to a state of mental fatigue and perceived overload throughout the workday.
Work Survival Club · 22 October 2026 · 3 min · Original reporting

The experience of a demanding workday is often characterised by an accumulation of tasks. One might feel overwhelmed by the sheer volume, the complexity, or the deadlines attached to each item on a to-do list. However, there is a distinct cognitive cost associated not merely with the quantity of work, but with the nature of the tasks being initiated.
Consider a day where every item feels like a fresh start. Each email response, each document review, each message in a collaboration tool—each demands the brain to context-switch, retrieve new information, and establish a new mental framework. This constant re-orientation, the repeated act of initiating a task, can be more metabolically expensive for the brain than maintaining focus on a single, extended activity.
The Cost of Initiation
Research into cognitive load and task switching indicates that the human brain expends significant energy when transitioning between different mental activities. While switching costs are broadly understood, the specific burden of task initiation is often overlooked. Psychologists have noted that the preparatory phase of a task, which involves recalling rules, setting goals, and suppressing irrelevant information, is a distinct and demanding cognitive process. Each 'first task' requires this preparatory effort.
For instance, a study published in Psychological Science on executive control posits that switching between tasks involves configuring the brain for the new task, a process that is not instantaneous and incurs a time and energy penalty. When these switches occur frequently, the cumulative effect can lead to a state of cognitive fatigue, even if individual tasks are not inherently difficult or long. This is distinct from simply continuing work on an existing task, where the mental model is already established and less re-configuration is required.
- Working Memory Depletion: Each new task demands that relevant information be loaded into working memory, pushing out previous contexts.
- Goal Shifting: The brain must actively suppress the goals of the previous task and activate the goals of the new one.
- Attention Re-allocation: Directing attention to new stimuli and filtering out distractions specific to the prior task requires effort.
- Retrieval Effort: Recalling necessary facts, procedures, or context for an entirely new item on the agenda.
The repeated act of initiating a task can be more metabolically expensive for the brain than maintaining focus on a single, extended activity.
Modern Work Amplifies the Issue
The structure of many modern desk jobs inadvertently fosters a high proportion of 'first tasks'. Constant notifications, fragmented work requests, and the expectation of rapid responses across multiple communication channels mean that employees are frequently pulled into initiating new, albeit small, tasks. A report from the UK Health and Safety Executive (HSE) on work-related stress, depression, or anxiety often cites workload, including the demands of multitasking and frequent interruptions, as key factors. While the report doesn't isolate 'first tasks', the described conditions contribute directly to an environment rich in them.
This continuous initiation prevents the brain from entering a state of sustained flow, where deep work and efficient processing are possible. The result is a feeling of being constantly busy without necessarily achieving significant progress on larger objectives, leading to a pervasive sense of overwhelm.
Mitigating the Load
Addressing the fatigue caused by an excess of 'first tasks' requires a conscious effort to restructure the workday. This is not simply about reducing the total number of tasks, but about strategically grouping similar activities or dedicating uninterrupted blocks to single, larger tasks.
- 1Batching Similar Tasks: Instead of responding to each email as it arrives, designate specific times for email processing. This creates fewer 'first task' instances.
- 2Creating 'Deep Work' Blocks: Schedule uninterrupted periods for complex projects. During these times, actively defer or ignore minor new initiations.
- 3Strategic Scheduling: Place demanding 'first tasks' earlier in the day when cognitive reserves are typically higher. Save less taxing, follow-up activities for later.
- 4Minimising Interruptions: Utilise focus modes on devices and communicate availability preferences to colleagues to reduce ad-hoc requests that demand new task initiation.
Recognising the particular cognitive drain of starting new tasks can provide a clearer understanding of why some busy days feel more exhausting than others. By structuring work to minimise these initiations, one might experience a reduction in mental fatigue, allowing for more sustained focus and a greater sense of accomplishment.
Sources
- Task Switching: An Overview (opens in a new tab) — American Psychological Association article discussing the cognitive costs of switching tasks.
General information about work and health, not medical advice. See our medical disclaimer.