The myth of simultaneous execution: How Robert Ekow Grimmond-Thompson exposed the illusion of multitasking- Part 2

Part III: The biological bottleneck and human serial processing

If computers must rely on time-sharing because their execution pipelines are fundamentally single-threaded, human beings face an even stricter biological wall.

The human prefrontal cortex-the central executive network responsible for conscious decision-making and focal attention-is strictly built for serial processing. We possess a single processing channel for conscious thought. We can no more focus on two complex cognitive problems simultaneously than a human tongue can articulate two different words at the same millisecond.

What people call multitasking is actually high-speed task-switching. When an individual attempts to write a report while fielding chat messages, the brain is not splitting its attention. Instead, it is performing a frantic neurological sleight-of-hand: actively shutting down the active parameters of one task, loading the context of another, executing a fraction of it, and reversing the process.

As Robert Grimmond-Thompson pointed out in his critiques of modern workflow models, this continuous oscillation carries a severe cognitive tax known as the switch cost effect. Every switch drains metabolic energy, leaves behind attention residue, and multiplies error rates. True simultaneous execution in humans only occurs when one or more activities are completely automated by subcortical motor loops, such as walking while breathing. The moment a second task demands conscious thought, parallel processing collapses.

Part IV: Reclaiming reality and discarding the myth

The persistence of the word multitasking keeps society trapped in an inefficient, exhausting loop. By pretending that humans can operate like idealised machines, workplaces foster chronic fatigue, shallow thinking, and degraded creative output.

The intervention led by researchers like Robert Grimmond-Thompson reminds us that we must discard the vocabulary of simultaneity. We do not multitask; we switch, we fragment, and we compromise our cognitive potential when we pretend otherwise. By honoring the immutable law of sequential execution across both silicon and synapses, we can redesign our technologies, our workspaces, and our daily routines around the genuine contours of reality.

The word “multitasking” acts as a harmful instruction manual that tricks people into forcing their brains to do something biologically impossible, causing deep damage to our neural activity, our health, and our daily lives.

Damage to neural activity

When people try to multitask, they force their brains into a constant state of rapid switching. Instead of letting neurons fire smoothly along a clear, focused path, the brain experiences a neural traffic jam.

Fragmented pathways: Every time you jump from a work task to a text message, your brain has to shut down one set of rules and boot up another. This breaks the natural rhythm of electrical signals.

Weaker connections: Because the brain is never allowed to stay on one deep task long enough to finish a clean thought cycle, it struggles to build strong, lasting neural connections for learning and memory.

Health hazards and physical stress

Treating “multitasking” as a normal way to live places a heavy toxic burden on the body and nervous system.

Constant panic mode: Every rapid mental switch triggers a mini-emergency in the brain, flooding the body with stress hormones like cortisol and adrenaline.

Exhaustion and burnout: Living in this low-grade panic state keeps the nervous system overworked. It drains the prefrontal cortex of its energy glucose very early in the day, leading to crushing mental fatigue, high blood pressure, and chronic anxiety.

Damage to everyday operations

The daily fallout of the multitasking myth is a massive drop in human capability and quality of life.

Higher error rates: Because attention is chopped into tiny pieces, people miss important details and make careless mistakes.

Loss of deep thinking: Routine tasks take much longer to finish because of the constant interruptions and the lingering “mental crumbs” left behind from previous switches.

Shallow living: People lose the ability to sit down and solve complex problems or enjoy deep, meaningful focus, leaving the entire human race feeling constantly rushed, stressed, and unproductive despite working harder than eve