Summary: Researchers at the University of Tübingen recorded the readiness potential and related brain activity in volunteers immediately before they performed a 192-meter bungee jump, demonstrating that this neural signal can be measured outside the laboratory during extreme, real-world decisions.
Source: University of Tübingen.
Surjo R. Soekadar, psychiatrist and neuroscientist at the University of Tübingen, together with doctoral candidate Marius Nann, successfully recorded the readiness potential—also known by its German name, Bereitschaftspotential—outside of a laboratory setting for the first time, capturing it prior to a 192-meter bungee jump.
The readiness potential is a characteristic negative voltage shift in the brain that typically precedes voluntary actions. It can appear several hundred milliseconds to more than a second before a person becomes consciously aware of the decision to act. First described in 1964 by Hans-Helmut Kornhuber and Lüder Deecke, the readiness potential was historically measured under highly controlled laboratory conditions while subjects repeatedly performed simple, self-initiated movements such as finger presses. Because the voltage change is extremely small—only a few millionths of a volt—most researchers considered real-life measurement impractical.
Advances in portable, wireless electroencephalography (EEG) technology motivated the Tübingen team to test whether this hallmark neural signal could be reliably recorded in a naturalistic, high-stakes situation. The researchers also set out to determine whether the extraordinary willpower required to perform a potentially life-threatening act would alter the characteristics of the readiness potential. To address these questions, two semi-professional cliff divers volunteered to have their brain activity recorded before performing bungee jumps from the Europa Bridge near Innsbruck, Austria—a 192-meter platform and the second tallest bungee site in Europe.
The study found that the readiness potential preceding the extreme, self-initiated act of stepping off a 192-meter platform displayed spatiotemporal dynamics similar to those documented in laboratory studies. Remarkably, the readiness potential emerged clearly after only a small number of jumps, indicating that the neural precursor to voluntary action is robust and detectable even in emotionally charged, real-world environments. The investigators emphasize that this outcome was enabled by recent improvements in mobile EEG systems, which allow high-quality brain recordings outside traditional laboratory settings.
Soekadar noted that the experiment illustrates how the boundaries of feasible neurotechnology applications are shifting and that portable brain recording may soon become part of everyday research and clinical practice. Nann highlighted that the readiness potential prior to the bungee jumps was well expressed, underscoring that the neural signature of action preparation remains observable even for decisions that require substantial courage and self-control.
The implications of this work extend to multiple areas: understanding voluntary action in realistic contexts, informing the development of brain–machine interfaces that must operate outside the lab, and providing a foundation for future studies that examine how stress, fear, or high motivation influence pre-movement brain activity. While this study involved a small number of experienced jumpers due to the practical constraints of extreme-sport experimentation, the clear presence of the readiness potential in these conditions supports the feasibility of studying pre-action neural dynamics in other naturalistic settings.
Source: University of Tübingen
Publisher: NeuroscienceNews.com (organized by the publisher)
Image Source: Image provided by the original publisher and in the public domain as noted by the source.
Original Research: Abstract and preprint available in bioRxiv; DOI: 10.1101/255083
To jump or not to jump: The Bereitschaftspotential required to jump into a 192-meter abyss
Self-initiated voluntary acts are preceded by a negative electrical brain potential, the Bereitschaftspotential (BP), which is measurable on the human scalp using EEG. Until now, recordings of the BP have been restricted to well-controlled laboratory settings. It was therefore uncertain whether this form of pre-movement brain activity also accompanies voluntary motor initiation in potentially life-threatening situations—actions that demand exceptional willpower, such as jumping into a 192-meter abyss. Here, the authors report BP recordings before self-initiated 192-meter extreme bungee jumps performed by two semi-professional cliff divers (both male, mean age 19.3 years). They found that the spatiotemporal dynamics of the BP recorded before these extreme jumps were comparable to those measured under laboratory conditions. These results, made possible by modern wireless and portable EEG systems, document for the first time pre-movement brain activity that precedes possible life-threatening decision making.
This article summarizes the published report and its abstract. The description here focuses on the experiment’s aims, methodology, and principal findings without adding new or unverified details.