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Fluency Can Look Like Understanding

A capable large language model can produce a medical explanation, legal analysis or moral argument that sounds considered. That surface resemblance creates the central problem in “How AI and Human Judgment Differ”: a model may arrive at an answer much like a person’s while getting there through a fundamentally different process.

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Thought Is More Than Inner Speech

Thinking often feels verbal. People silently rehearse an argument, name the pieces of a problem or search for the sentence that captures an idea. That experience makes it tempting to assume that language is the machinery of thought itself. In “Thinking without Words,” Scientific American senior editor Gary Stix interviews neuroscientist Evelina Fedorenko about evidence that points in a different direction: language is extraordinarily useful for communicating thought, but the brain does not need words to produce complex cognition.

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What Deep Focus Looks Like in the Brain

Concentration can sometimes feel less like effort than immersion. A difficult problem gradually comes into focus, distractions recede, and the answer seems to assemble itself on a mental blackboard. In “How Expertise Improves Concentration,” neuroscientist Hanna Poikonen asks what the brain is doing during that state—and whether years of practice make it easier to enter.

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Two Ways to Have a Good Life

A screaming baby at two in the morning can make a parent miserable without making parenthood feel meaningless. That tension is the “parenting paradox”: compared with adults without children, parents often report more stress, depression and low moods in daily life, yet they can also describe their lives as more satisfying overall.

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A Familiar Feeling with an Unsettled Explanation

Tickling is instantly recognizable but scientifically slippery. It blends touch, laughter, anticipation, emotion and social context into a sensation that can feel playful in one moment and unbearable in another. In “The Surprising Science of Tickling,” neuroscientist Konstantina Kilteni argues that this odd experience offers a useful way to study how the brain combines bodily signals and predicts what a touch will feel like.

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Memory is fallible, but that does not mean it is easy to rewrite wholesale. People forget details, confuse sources and absorb misleading suggestions. The more alarming claim is that an experimenter or therapist can readily implant a vivid memory of an entire event that never occurred. Psychologists Bernice Andrews and Chris R. Brewin argue that the evidence for this stronger claim is much weaker than it is often made to seem.

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People move through a hidden landscape whenever they enter a classroom, workplace or group chat. They track who belongs together, who carries influence, which relationships have weakened and how information is likely to travel. Neuroscientist Oriel FeldmanHall argues that this is more than social intuition: the brain builds a cognitive map of relationships, borrowing some of the same machinery it uses to navigate physical space.

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Neandertals were once portrayed as dull evolutionary failures, separated from modern humans by a wide intellectual gulf. Archaeology has steadily erased that caricature. They made sophisticated tools, processed plants into food, treated illness, used symbols and cared for their dead. Then the first Neandertal genome delivered an even more intimate correction in 2010: Neandertals and Homo sapiens interbred, and their DNA still forms part of many living human genomes.

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Most adults can summon a first childhood memory, but it usually comes from no earlier than preschool. The blank stretch before that is known as infantile amnesia. It appears in college students and grandparents alike, which suggests that it is not simply the ordinary fading that affects all memories over time. The puzzle is stranger: babies plainly learn about people, objects and language, yet adults cannot consciously revisit events from their own infancy.

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Adolescence is often described as a neurological waiting room: emotions run hot, self-control is unfinished, and sound judgment will arrive only when the prefrontal cortex matures. Neuroscientist Mary Helen Immordino-Yang argues for a more constructive view. Teenagers’ sensitivity and intensity are not merely problems to contain. They help power a new capacity to connect immediate experience with identity, ethics, history and imagined futures. When adolescents practice this kind of reflection, the article suggests, they may actively shape the developing brain.