Brain Doesn't Work in Parallel: New Research Debunks Multitasking Myth

The human brain cannot process information in parallel, but switches between tasks sequentially, which ultimately debunks the common myth of effective multitasking. The results of the research, reported on March 12, 2026, by leading German media, including N-tv, Die Welt, and Zeit Online, point to the existence of insurmountable cognitive barriers in the human mind. Even in situations requiring simultaneous focus on several activities, this organ performs operations one after another, which inevitably leads to delays in response. This phenomenon occurs regardless of the complexity of the undertaken actions or the individual predispositions of a given person. Scientists emphasize that attempts to force multitasking result in reduced precision and an extension of the time needed to complete individual stages of work.

A key conclusion from the analyses is the fact that even intensive training and years of practice cannot eliminate the innate limitations of the human cognitive apparatus. Research on the limitations of human cognition has been ongoing for decades, and the concept of a bottleneck in information processing was developed, among others, within German research programs such as SPP 1772. Previous analyses, including those from 2018, suggested that simultaneous use of social media during learning negatively impacts educational outcomes. Contemporary cognitive psychology consistently indicates that attention resources are exhaustible and impossible to divide infinitely without loss of quality. Robert Gaschler, a professor at the FernUniversität in Hagen and a recognized expert in the field of psychology, points to the existence of a structural limitation known as a bottleneck. It is precisely this mechanism that prevents the simultaneous making of decisions concerning different streams of information, forcing the nervous system to queue them.

Publications in Wirtschafts Woche and Die Welt note that the process of switching between tasks generates so-called switching costs, which are felt even by people declaring high proficiency in multitasking. The brain must each time activate the set of rules needed to perform a new task, which consumes time and metabolic energy, leading to faster fatigue. This research has significant implications for road safety and efficiency in the professional environment, where distraction is a main factor generating errors. Experts suggest that instead of striving for biologically impossible parallelism, a much more effective strategy is to focus on single, closed blocks of tasks. Myth vs. Cognitive Reality: Data Processing: Parallel (multitasking) → Sequential (serial); Impact of Training: Elimination of Limitations → No Change in Process Structure