File:Brain-Computer-Interface-The-three-main-BCI-signal-acquisition-ti-6f1f1abd.jpg

The three main BCI signal acquisition tiers — scalp EEG, electrocorticography grid, and intracortical electrode array — compared by invasiveness and signal resolution.

AI-generated illustration for Brain-Computer Interface, made with fal.ai (fal-ai/flux-2-pro).

Prompt: A side-by-side comparison of three brain-computer interface acquisition tiers arranged from least to most invasive: a person wearing a dome-shaped electrode cap resting on the scalp surface, a surgical view of a flat grid of electrodes laid directly on the exposed cortex surface, and a close-up of a slender electrode array with multiple sharp prongs penetrating into brain tissue, with signal waveform indicators beside each showing progressively sharper and more detailed neural traces. Style: Detailed digital illustration blending technical schematic linework with painterly atmospheric rendering, as if a scientific textbook were reimagined by a noir graphic novelist. Colour palette of deep midnight blue, charcoal black, and slate grey as foundations, accented with electric teal, bioluminescent green, and cold amber. Lighting is dramatic and directional, suggesting surveillance or laboratory environments — pools of cold light against deep shadow, with occasional glowing circuit-trace highlights. Compositions favour tight framing with layered depth: foreground technical detail dissolving into abstracted background geometry. Detail level is high but purposeful, prioritising legible structure over decorative complexity. Mood is clinical yet ominous, precise yet unsettling. No text, lettering, captions, logos, watermarks or borders unless it is a technical drawing.