NASA’s interest in nature and fractals stems from the need to maintain astronaut mental health during long-duration space missions, where “space fog” (cognitive fatigue) and isolation are significant risks. NASA researchers, in collaboration with external experts like physicist Richard Taylor, used a combination of physiological and neurological metrics to determine these benefits.

Here is how NASA and its partners determined the value of nature and fractals for cognitive recovery:

1. Identifying “Fractal Fluency”

NASA-supported research explored the concept of Fractal Fluency. This theory suggests that because the human eye and brain evolved in natural environments filled with fractals (clouds, trees, coastlines), we have developed a visual system that processes these specific patterns with extreme efficiency.

• Method: Researchers used Eye-Tracking to observe how people look at natural vs. man-made scenes. They found that our eyes move in a fractal “search pattern” that matches the dimension of nature.
• Finding: When the pattern we look at matches the internal search pattern of our eyes, the brain doesn’t have to work as hard, leading to “effortless” processing.

2. Measuring Brain Waves (EEG)

To quantify the “relaxation” effect, researchers used Electroencephalography (EEG) to monitor brain activity while subjects viewed fractal patterns of varying complexity (measured as “D” or fractal dimension).

• Method: Subjects were shown images of nature (trees, mountains) and fractal art (like Jackson Pollock’s paintings).
• Finding: Patterns with a specific fractal dimension (between D = 1.3 and 1.5) triggered a massive increase in Alpha brain waves. Alpha waves are associated with a state of “relaxed wakefulness” or light meditation. This is the physiological signature of cognitive recovery.

3. Physiological Stress Reduction

NASA looked at how nature could act as a “countermeasure” for the high-stress environment of a spacecraft.

• Method: Studies measured Skin Conductance (a measure of the sympathetic nervous system’s “fight or flight” response) and Cortisol levels.
• Finding: Exposure to mid-complexity fractals was found to reduce physiological stress levels by up to 60%. For NASA, this demonstrated that nature-like visuals could effectively “reset” the nervous system after high-workload tasks.

4. Attention Restoration Theory (ART)

NASA applied Attention Restoration Theory, which posits that there are two types of attention:

• Directed Attention: Used for complex tasks, reading, and operating machinery. It is finite and leads to “cognitive fatigue.”
• Soft Fascination: Triggered by nature (fractals). It requires no effort and allows the brain’s “directed attention” mechanisms to rest and recharge.
• NASA’s Application: By incorporating “virtual” nature or fractal patterns into the design of space habitats, NASA aims to provide astronauts with “micro-restoration” breaks to prevent the cognitive decline associated with long missions.

5. Practical Application: Biophilic Design

Based on these findings, NASA’s Human Systems Integration Division looks at “Biophilic Design”—integrating natural elements into artificial environments. This includes:

• Using fractal-patterned textures on habitat walls.
• Projecting nature scenes or using VR to simulate Earth-like environments.
• Selecting window views (when possible) that provide high-fractal-content scenery to help astronauts recover from the “mental fog” of spaceflight.