心理学における認知とは何か？

What Does Cognitive Mean in Psychology? - Biology Insights close Biology Insights close Anatomy and Physiology Animal Kingdom Biotechnology & Bioengineering Biotechnology and Research Methods Botany and Plant Sciences Cellular & Molecular Biology Chemistry Earth Science & Climate Ecology & Environment Ecology and Conservation Environmental Science Evolution & Origins of Life Genetics & Heredity Genetics and Evolution Human Body & Health Marine Biology Microbiology Pathology and Diseases Plant Kingdom Scientific Principles & Methods In psychology, “cognitive” refers to the mental processes your brain uses to take in, organize, and use information. That includes perception, thinking, memory, attention, language, problem-solving, and judgment. When psychologists describe something as cognitive, they’re pointing to the internal mental activity behind what you do, not the behavior itself. This distinction matters more than it might seem. For decades, mainstream psychology deliberately ignored internal mental life. Understanding why the field shifted back to studying the mind, and what “cognitive” actually covers, gives you a much clearer picture of how the term is used today. Why Psychology Started Talking About Cognition For the first half of the 20th century, a movement called behaviorism dominated American psychology. Behaviorists argued that mental events aren’t publicly observable, so the only legitimate evidence is behavior you can see and measure. Under this framework, perception became “discrimination,” memory became “learning,” language became “verbal behavior,” and intelligence became “what intelligence tests test.” The inner workings of the mind were essentially off-limits. By the mid-1950s, this approach was running into walls. The linguist Noam Chomsky pointed out that defining psychology as the science of behavior was like defining physics as the science of meter reading. You could describe what people did, but you couldn’t explain why. Researchers studying language found that statistical models of word patterns couldn’t account for how people actually form sentences. The grammatical rules governing language aren’t behaviors you can observe. They’re mental processes happening inside the mind. The turning point came around 1956, sometimes called the birth year of cognitive science. At a symposium at MIT that September, researchers from psychology, linguistics, and computer science presented work that treated the mind as something worth studying directly. This “cognitive revolution” reintroduced mental processes as legitimate scientific territory, and the term “cognitive” became central to how psychologists describe the mind’s inner work. The Core Mental Processes When psychologists use “cognitive,” they’re typically referring to a specific set of mental activities: Perception: how your brain interprets sensory information from your eyes, ears, and other senses into something meaningful. Attention: how you select what to focus on and filter out distractions. This isn’t a single process but involves multiple brain networks, including one for deliberate focus and another for detecting things that suddenly matter. Memory: how you encode, store, and retrieve information. This breaks into several types. Working memory lets you hold and manipulate information in the moment. Episodic memory stores personal experiences. Procedural memory handles skills and habits, like riding a bike. Language: how you produce and understand speech, reading, and writing. Reasoning and problem-solving: how you evaluate evidence, draw conclusions, and work through challenges. Decision-making: how you weigh options and choose between them. These processes don’t operate in isolation. Reading a sentence, for instance, requires perception (seeing the words), attention (focusing on the text), memory (recognizing word meanings), and language processing, all working together in fractions of a second. The Computer Analogy One of the most influential ideas in cognitive psychology is that the mind works somewhat like a computer. Sensory input comes in, gets processed through stages of attention, perception, and memory, and eventually produces an output: a decision, an action, or a stored memory. This is called information processing theory. The analogy isn’t perfect, but it gave researchers a practical way to study mental activity. Instead of treating the mind as a black box (as behaviorists did), they could propose specific stages where information gets encoded, stored, and retrieved, then design experiments to test those stages. Today, researchers use artificial intelligence models trained on real-world data to simulate and predict human cognitive processes, pushing this computer-mind parallel even further. Executive Function: Cognition in Action One of the most practically important cognitive concepts is executive function, the set of higher-level mental skills that let you manage your own thinking and behavior. It has three core components. Working memory lets you hold information long enough to use it, like keeping a phone number in your head while you dial. Cognitive flexibility is your ability to shift smoothly between tasks, thought processes, or situations when circumstances change. And inhibitory control governs how well you manage your impulses, emotions, and focus, keeping you from blurting out something inappropriate or getting pulled off task. These three skills work together in almost everything you do, from following a conversation to planning your day to resisting the urge to check your phone during a meeting. When people talk about someone having strong or weak “cognitive skills,” they’re often referring to executive function without realizing it. How Cognition Develops With Age Cognitive abilities aren’t fixed from birth. They develop in a predictable sequence, mapped out most famously by the psychologist Jean Piaget in four stages. From birth to about age 2, infants learn through their senses and physical actions. A major milestone during this period is object permanence, the understanding that something still exists even when you can’t see it. This typically emerges between 5 and 8 months and signals that memory is coming online. By 18 to 24 months, early language appears, marking the beginning of symbolic thinking. Between ages 2 and 7, children start thinking symbolically. They engage in pretend play, use objects to represent other things, create mental images, and begin drawing pictures of their world. But their thinking is still largely tied to their own perspective. From roughly 7 to 11, children develop logical thinking about concrete, real-world situations. They can group objects by category, arrange items by size, and understand that pouring water into a differently shaped glass doesn’t change the amount of water. Around age 12 and into adulthood, abstract thinking emerges. Adolescents can manipulate symbols in algebra, think systematically about possibilities, develop theories, and grapple with abstract concepts like justice. Not everyone reaches this stage at the same pace, and some types of abstract reasoning continue developing well into the twenties. Metacognition: Thinking About Thinking One cognitive process deserves its own mention because it sits a level above the rest. Metacognition is the ability to think about your own thinking. It involves knowing what you know (and what you don’t), choosing the right strategy for a task, monitoring whether that strategy is working, and evaluating the outcome afterward. This sounds abstract, but it shows up constantly in everyday life. When you reread a paragraph because you realize you weren’t absorbing it, that’s metacognition. When you decide to make a grocery list because you know you’ll forget items otherwise, that’s metacognition. Students with stronger metacognitive skills tend to learn more effectively because they can identify gaps in their understanding and adjust their approach, rather than just studying harder with a strategy that isn’t working. Where Cognition Lives in the Brain Cognitive processes map onto specific brain structures, though most complex tasks involve multiple regions working together. The prefrontal cortex, the area behind your forehead, is essential for planning, problem-solving, and the inhibitory control that keeps impulsive reactions in check. Working memory also relies heavily on this region. The hippocampus, a small curved structure deep in the brain, plays a central role in forming and retrieving memories of personal experiences. Procedural memory, the kind that stores learned skills and habits, depends instead on the basal ganglia and cerebellum. Language production and comprehension are traditionally associated with two areas in the left hemisphere known as Broca’s area and Wernicke’s area, though modern research shows language networks are more distributed than originally thought. Cognitive Principles in Therapy The word “cognitive” appears most visibly in everyday life through cognitive behavioral therapy, or CBT, one of the most widely used and studied forms of psychotherapy. CBT is built on a straightforward cognitive principle: the way you think directly affects how you feel and what you do. Unhelpful thinking patterns lead to unhelpful emotions and behaviors, and the cycle reinforces itself. In practice, CBT involves identifying the specific thoughts, beliefs, and interpretations that contribute to distress, then learning to recognize and replace them with more accurate or helpful ones. If you automatically interpret a friend’s short text message as anger, for example, a therapist might help you examine whether that interpretation is supported by evidence and explore alternative explanations. Over time, you build new thinking habits that change your emotional and behavioral responses. The “cognitive” in CBT refers to this direct work on thought patterns, treating your internal mental processes as something you can observ