Is ChatGPT Conscious? A Pioneer of AI Explains | Dr. Terry Sejnowski

What It Covers

Dr. Terry Sejnowski, Salk Institute neuroscientist and Boltzmann machine co-creator, examines whether ChatGPT genuinely understands language, identifies the 100-plus brain components absent from current AI systems, and outlines nature-inspired directions for developing more autonomous, capable AI agents.

Key Questions Answered

• •Understanding is multi-dimensional: Resist applying a single standard when evaluating whether AI "understands." A physicist and a carpenter both understand wood differently — one theoretically, one practically. ChatGPT builds internal semantic models that improve with scale, making its comprehension genuinely comparable to some human understanding, depending on domain and training data depth.
• •What ChatGPT structurally lacks: Current large language models replicate only the cerebral cortex function — roughly one of 100 essential brain regions. Missing components include goal-setting drives (survival, reproduction), reinforcement learning feedback from the basal ganglia, and continuous self-generated neural activity. Without these, sentience is structurally impossible in present architectures.
• •Silence reveals non-sentience: When ChatGPT stops responding, zero activity occurs inside the network until the next prompt arrives. Humans placed in sensory isolation continue planning, emoting, and processing continuously. This absence of spontaneous internal activity is the clearest structural indicator that current models lack any meaningful form of consciousness or sentience.
• •Hallucinations are creativity's flip side: AI hallucinations are not random errors — they produce highly plausible outputs that could exist but do not. This mirrors human confabulation, seen clinically in Korsakoff syndrome. Recognizing hallucinations as a creativity mechanism rather than a reliability flaw reframes how practitioners should calibrate trust and verification workflows when deploying language models.
• •Jobs change, not disappear — but prompting skill matters: AI functions as a shovel, not a replacement worker. Users who learn structured prompting gain disproportionate productivity gains. Sejnowski dedicates a full book chapter to prompt engineering, arguing that interacting with ChatGPT requires deliberate skill-building comparable to learning a new professional tool, not passive adoption.