Chapter 6 pivots from explaining the brain’s current functions to speculating on its future. The case of Cameron Mott, who had half her brain removed, is the evidential bedrock for Eagleman’s forthcoming predictions, establishing the brain as “liveware” that “reconfigures its own circuitry” (181). From this foundation, the author builds two parallel lines of argument concerning inputs and outputs: first, how technology like cochlear implants and sensory substitution devices can feed new data streams into the brain, and second, how brain-machine interfaces can control external limbs, as with Jan Scheuermann’s robotic arm. These contemporaneous breakthroughs ground the chapter’s more speculative ideas in existing, verifiable technology. The argument then escalates, moving from enhancing the body to transcending it entirely through cryopreservation and digital uploading. The final section confronts the philosophical hurdles of these future scenarios, using thought experiments like the Chinese Room and scientific theories like emergence to explore the nature of consciousness itself. Eagleton’s deliberate progression from the present to the far future moves this section from an objective discussion of scientific knowledge into a hypothetical think-piece on human destiny.

In this final chapter, Eagleman augments the book’s presentation of brain plasticity, expanding its popularly understood meaning as a mechanism for learning and adaptation to being the key that unlocks humanity’s self-directed evolution. While previous chapters treat plasticity as a way the brain fine-tunes itself in response to experience, this chapter presents it as an exploitable feature that allows for radical augmentation. This reconceptualization represents the culmination of the book’s argument for Neuroplasticity as Evolutionary Advantage. The brain’s unfinished, adaptable nature is no longer just a benefit for surviving varied environments but is the very trait that enables a “marriage of our biology and our technology” (177). Assistive devices for sensory impairment, like the author’s VEST technology, are proof of principle for a future of sensory addition. By demonstrating the brain’s capacity to interpret entirely novel data streams, the chapter argues that humans are no longer bound by the senses inherited through natural selection. The brain is positioned as a general-purpose processor, ready to be plugged into an expanding array of peripherals that will fundamentally alter our experience of reality.

As before, case studies function as important evidentiary bridges between abstract scientific principles and their tangible human consequences. The story of Cameron Mott’s recovery provides a visceral demonstration of the brain’s rewiring capacity, making the concept of plasticity concrete and unforgettable. Similarly, the experience of cochlear implant users learning to interpret alien signals and the athletic feats of Erik Weihenmayer using the BrainPort highlight the lived human effects of these devices. Jan Scheuermann’s ability to control a robotic arm with her thoughts provides a powerful, real-world anchor for the otherwise futuristic idea of bionic body-enhancement. These individual stories build a foundation of credibility for the chapter’s more speculative claims. By first presenting verified, documented instances of the brain integrating with technology, the author makes the subsequent leap to ideas like digital immortality and artificial consciousness seem less like science fiction and more like the logical next steps in a process that has already begun.

The chapter concludes by moving this technological futurism toward philosophical and scientific inquiry into the nature of consciousness. The author poses the critical question of whether a system that only manipulates symbols without meaning can ever achieve true consciousness, taking the theme of Reality as a Neurological Construct to its logical theoretical endpoint. Eagleman’s comparison of the brain’s billions of neurons to an ant colony’s millions of individual ants provides an accessible metaphor for how complex, intelligent behavior can arise from the interaction of simple components. This idea is further substantiated with a discussion of Giulio Tononi’s integrated information theory, which proposes a quantitative, structural basis for consciousness. By engaging with these complex ideas, the chapter suggests that understanding what makes us “us” might ultimately be answered through science, potentially allowing for consciousness to be replicated beyond its biological origins.