G. T. Fechner (1848): Plants as sentient living beings

While Gustav Theodor Fechner (1801-1887) is widely celebrated as the founder of experimental psychophysics, his pioneering work on the psychic life of plants - Nanna, oder über das Seelenleben der Pflanzen (1848) - has historically been relegated to the margins as mystical or unscientific. However, a contemporary re-examination reveals that Fechner’s arguments were deeply rooted in empirical observation and inductive reasoning, anticipating current discourse on plant intelligence, learning, and communication. Regarding plant awareness, for instance, Fechner posits that their intimate physical immersion in earth, water, air, and light necessitates that every environmental fluctuation be accessible to their experience. For a sessile organism, survival demands total immersion in the present moment; thus, while the plant may lack the temporal cognitive representations (memory and anticipation) typical of animals, Fechner hypothesizes that its immediate sensorial experience may have reached a degree of intensity even exceeding that of human beings. Overall, Fechner’s perspective offers plant biologists, psychologists, and neuroscientists an original framework to reconceptualize intelligence and perception, suggesting that sentience is an intrinsic property of life itself rather than a mere derivative of neural complexity.