Chapter 4: Alive to Feeling: Plant Sensation

Alive to Feeling: Plant Sensation begins by illustrating the striking similarities between animal and plant electrical systems, noting that general anesthesia dampens action potentials in sensitive plants like the Venus flytrap and Mimosa pudica just as it does in humans. The text details the phenomenon of thigmomorphogenesis, where physical touch triggers genetic and hormonal shifts that alter growth patterns, causing plants to become stouter or more flexible to survive environmental stress. Historical context is provided through the work of J.C. Bose, an early pioneer who hypothesized the existence of plant nerves, and follows the trajectory to modern researchers like Elizabeth Van Volkenburgh and Simon Gilroy. The chapter explains how contemporary science utilizes green fluorescent proteins to visualize calcium waves moving through plant tissues, revealing how plants transmit information about wounding and touch at high speeds. Significant attention is given to the role of glutamate, a neurotransmitter shared with mammals, which accelerates these electrical signals, acting similarly to a nervous system despite the absence of neurons. The discussion also addresses the mystery of gravitropism—how plants sense gravity without an inner ear—and employs the theory of convergent evolution to suggest that plants developed functional equivalents to animal neural networks. Ultimately, the chapter proposes the radical hypothesis that a plant’s entire body operates as a distributed brain, capable of integrating complex sensory inputs to possess a form of biological agency and awareness.