The Conceptual Nervous System
This is not a single-argument monograph but a curated collection of twenty-one papers Hebb published between 1951 and 1977, edited by his student Henry A. Buchtel. The volume's distinctive contribution is retrospective: it gathers Hebb's post-Organization of Behavior writings in which he repeatedly tested his cell-assembly theory against new physiological evidence and revised it in light of the ascending reticular activating system. The title comes from Hebb's 1955 paper 'Drives and the C.N.S.,' where he reclaimed Skinner's dismissive phrase to argue that a well-constructed conceptual nervous system is a necessary theoretical tool, not a concession to speculation.
Key Insights
✦What is The Conceptual Nervous System, and how does it relate to Hebb's The Organization of Behavior?
The Conceptual Nervous System is a post-Organization collection of twenty-one papers Hebb published between 1951 and 1977, edited by his former student Henry A. Buchtel and published by Pergamon Press in 1982 . It is not a new monograph but a retrospective assembly. A contemporary French review noted that the book's great merit is presenting articles all posterior to The Organization of Behavior, in which Hebb submits his theory to the test of facts and the facts to the test of his theory in a constant back-and-forth . Where the 1949 book built the cell-assembly framework, these papers show Hebb revising it as new evidence—particularly the ascending reticular activating system—became available.
✦Where does the title come from, and what did Hebb mean by 'conceptual nervous system'?
The title comes from Hebb's 1955 Psychological Review paper, 'Drives and the C.N.S. (Conceptual Nervous System)' . Hebb explained that B.F. Skinner had joked that for psychology, CNS stands for 'conceptual' rather than 'central' nervous system—a dismissal of neurological theorizing. Hebb reclaimed the phrase with a qualified defense: 'if we have to conceptualize the nervous system, let's conceptualize it as well as we can' . The conceptual nervous system is therefore a theoretical model of internal mediating structures—not a claim about anatomy, but a necessary bridge between stimulus and behavior when brain imaging could not yet provide direct evidence . Hebb was candid that his model was speculative, but argued speculation disciplined by evidence generates research.
✦How was the book received by reviewers, and what did they identify as its value?
The 1986 review in L'Année psychologique praised the volume's twofold merit. First, it presents a selection of papers in which Hebb constantly tests his theory against facts and integrates major contributions from neuroscience and psychology over the years—covering motivation, attention, perception, learning, consciousness, language, intelligence, and creativity . Second, it reveals lesser-known aspects of Hebb's personality: his epistemological concern and his passionate interest in the relationship between psychological science and society, producing pages the reviewer called 'savory and always fascinating' . The review noted that Hebb remained resolutely anti-dualist and deterministic, but diametrically opposed to Watsonian reductionism, arguing that free will is a biological phenomenon—control of behavior by thought—not an absence of determinism.
✦What does the collection reveal about Hebb's revisions to his own theory?
The papers show Hebb integrating the ascending reticular activating system (ARAS), discovered by Moruzzi and Magoun in 1949—the same year The Organization of Behavior appeared. In his 1955 paper, Hebb explained that his earlier book could not incorporate this discovery, which provided a physiological basis for arousal and intrinsic motivation . The ARAS research suggested that the cortex is not inert without external stimulation, and that motivation requires varied sensory input. Hebb used this to explain phenomena from mountain-climbing to 'paralysis of terror' as departures from an optimal arousal level . The collection thus documents Hebb doing what he said theorists should do: revising conceptual models as physiology advances.
✦Is this book accessible to readers without a neuroscience background?
It is a collection of technical papers written for psychologists and neuroscientists, not a popular work. The chapters assume familiarity with the experimental literature of the 1950s through 1970s, and several engage in detailed physiological argument. The 1986 reviewer noted that the book reveals Hebb's epistemological concerns and his interest in science-society relations, suggesting some chapters are more broadly accessible than the strictly physiological ones . However, readers without background in biological psychology will find the core theoretical papers challenging. Those seeking an accessible entry to Hebb's ideas should start with The Organization of Behavior or a secondary account of the cognitive revolution; this volume is for readers already familiar with the framework.
✦What is the significance of the 1955 paper 'Drives and the C.N.S.' in Hebb's career?
The 1955 paper is the volume's namesake and one of Hebb's most cited articles, with over 380 citations by 1979 according to his Citation Classic commentary . Hebb described it as a 'little joke' that turned serious: he wanted to bring Skinner's dismissive 'conceptual nervous system' and his own neurologizing up to date with the ARAS discovery. The paper argued that motivation is not solely a matter of biological drives (hunger, pain, sex) but involves a continuum of arousal from deep sleep to strong emotion, with adaptive behavior at intermediate levels . This framework made sense of curiosity, exploration, and fear-seeking behavior that drive-reduction theory could not explain, and it remains a foundational statement of arousal theory.
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