Using Emily Dickinson’s poetry as a point of entry, the author explains how reading circuits form in the brain. Within limits, the brain’s principle of plasticity allows it to create new circuits for cultural inventions like reading by connecting and repurposing older visual and language systems. Unlike oral language, which is supported by dedicated genes and emerges naturally, reading must be taught; no genetic blueprint exists. As a result, the circuit’s formation varies with the writing system (e.g., Chinese versus alphabetic) and with environmental factors—what is read, how it is read, and instructional methods—yielding more or less sophisticated circuits.

Wolf depicts the reading circuit as a circus with five overlapping rings—vision, language, cognition, motor functions, and affect—and an executive control box in the prefrontal cortex. In reading the single word “tracks,” multiple attentional systems disengage from prior focus, orient to the word, alert the circuit, and hold information in working memory. In the vision ring, retinal pathways pass through the optic chiasm to the visual striate cortex, where specialized neuronal groups identify letters, features, patterns, and morphemes via retinotopic organization and representation.

In the language ring, phoneme-based processes map sounds to letters, while semantic networks propose meanings for the word, such as animal tracks, railway tracks, or verb forms. Motor regions prepare to articulate or simulate actions associated with the word. The cognition ring activates memories and associations—such as childhood trains or images from Anna Karenina (1879)—and the affect ring adds corresponding emotions. A region near the angular gyrus integrates inputs from vision, language, and cognition. In real time across both hemispheres, the circuit appears as seamlessly connected networks, with thousands of neuronal groups activating for a single word. The same plasticity that enables this complexity also makes the circuit vulnerable to change.

Wolf shifts her discussion from single words to sentences, exploring how the brain processes such data as, “His love left no tracks, save for the kind that never go away—for her and any who would follow” (35). When readers confront unexpected meanings as found in this sentence, Wolf notes that brain-imaging shows the brain responding using “several language-based regions” (37).. Wolf  warns that screen reading may be altering expert readers’ ability to engage this way with demanding texts, as attention allocation determines comprehension quality according to tests conducted by head of the Human Genome Project, Francis Collins.

Deep reading’s evocative processes begin with imagery, illustrated by Earnest Hemingway’s six-word story, “For sale: baby shoes, never worn” (42). Even in this micro narrative, sensory details trigger the reader’s background knowledge, inferences, emotion, and empathy. This experience—or what theologian John Dunne calls “passing over”—allows readers to enter others’ consciousnesses. Wolf offers several examples of this phenomenon, including a terminally ill girl transformed by performing as multiple Shakespearean heroines; readers experiencing slavery through Toni Morrison’s Beloved (1987); or Niccolò Machiavelli dressing formally to converse with historical authors. 

Research by 18th-century literature scholar Natalie Phillips shows how reading fiction activates readers’ motion and touch regions of the brain; readers can feel and experience what the characters are experiencing in their bodies. Related studies tie written metaphors of movement and texture to motor and somatosensory systems in the reader’s brain. Reading about others’ experiences can thus help readers understand perspectives beyond their own. However, as Stanford University researcher Sara Konrath’s work shows, there has been a 40% decline in empathy among young people within the past two decades. Deep reading, Wolf therefore argues, can cultivate the capacities essential for citizenship, a notion Barack Obama discussed in a conversation with the novelist Marilynne Robinson. If readers do not have the internal background knowledge to support comprehension and prediction, they might become reliant on external servers to evaluate information and become susceptible to falsehoods. 

Wolf explains how analytical processes in the brain allow readers to use analogy and inference to experience a work on a deeper level, generating hypotheses about the text’s more complex meaning. For example, Sherlock Holmes uses analysis, deduction, and induction to infer deeper meanings to each clue he encounters. Prefrontal networks in the brain weigh predictions, while critical analysis synthesizes a text using knowledge, analogies, and inferences to assess assumptions and conclusions. Wolf argues that this effortful work is threatened by a culture valuing immediacy and efficiency. As literary scholar Mark Edmundson posits in his book Why Read? (2004), Wolf holds that without the practice of close and deep reading, populations will encounter two hazards: rigid adherence to belief systems that block evidence-based thought and the absence of developed frameworks among youth.

Wolf argues that insight is the culmination of deep-reading processes, when multiple strands converge to produce new thoughts. She cites Rilke’s Stories of God (1899) and Marilynne Robinson’s Gilead (2004) to show how deep reading can yield profound philosophical realizations for the engaged reader. 

From a neuroscientific standpoint, creativity is linked to distributed networks, especially the prefrontal cortex and anterior cingulate gyrus. In the final phase of reading, an expanded cognitive workspace opens for reflection that can generate ideas beyond previous boundaries. Wolf closes with Catherine Stoodley’s illustration of the elaborated deep-reading circuit and a caution that the circuit’s plasticity makes future digital iterations both consequential and uncertain.