Cognitive Neuroscience: One Concept a Day

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A daily learning channel that unpacks one important cognitive neuroscience concept per article — spanning landmark studies, cutting-edge papers, and foundational ideas across the full field, with MIT 9.13 as a guiding curriculum framework.

Cognitive Neuroscience: One Concept a Day06/20/2026, 12:13:13 AM

Spike-Timing-Dependent Plasticity: The Brain's Millisecond Learning Rule

Spike-timing-dependent plasticity explains how synapses use millisecond timing to decide whether an input should strengthen or weaken. This article connects the Markram 1997 and Bi & Poo 1998 landmark experiments to NMDA receptor mechanisms, dendritic signals, neuromodulation, and the limits of treating STDP as a universal learning rule.

Cognitive Neuroscience: One Concept a Day06/19/2026, 12:14:02 AM

Long-Term Depression: How Synapses Learn to Weaken

Long-term depression is the controlled weakening side of synaptic plasticity. This article explains the 1992 Dudek and Bear landmark experiment, the NMDA receptor and AMPA receptor mechanisms behind LTD, why LTD is not just forgetting, and how it complements LTP in learning systems.

Cognitive Neuroscience: One Concept a Day06/18/2026, 12:18:14 AM

Long-Term Potentiation: How Synapses Learn

Long-term potentiation is the classic cellular model for how experience can leave a durable trace in the brain. This article explains the 1973 Bliss and Lømo landmark experiment, the NMDA receptor and CaMKII mechanism, and why LTP is best understood as one memory mechanism rather than memory itself.

Cognitive Neuroscience: One Concept a Day06/17/2026, 08:13:34 AM

Border Cells: How the Brain Marks the Edges of Space

Border cells fire when an animal is near an environmental boundary, giving the brain's navigation system an anchor for walls, edges, barriers, and drops. This article explains the 2008 Solstad et al. landmark paper, the boundary vector cell model, and why boundaries help stabilize place and grid maps.

Cognitive Neuroscience: One Concept a Day06/16/2026, 08:12:05 AM

Patient H.M. and the Discovery That Memory Is a Distinct Brain Function

In 1953, a surgical attempt to cure a young man's epilepsy accidentally destroyed his ability to form new memories. This article tells the story of patient H.M. (Henry Molaison), how neuroscientist Brenda Milner extracted fundamental principles from his strange condition, and why the landmark 1957 Scoville & Milner paper established that memory is a distinct brain function handled by the medial temporal lobe — separate from intelligence, perception, or skill learning.

Cognitive Neuroscience: One Concept a Day06/15/2026, 08:26:27 AM

Head Direction Cells: The Brain's Internal Compass

In 1983, James Ranck Jr. found neurons in the rat dorsal presubiculum that fire whenever the animal's head points in one specific compass direction — regardless of where in the room the animal stands. This article explains how head direction cells work, what their tuning curves reveal, how the vestibular-to-cortex circuit generates and sustains the directional signal, and why the ring attractor model built to explain them became a cornerstone of computational neuroscience.

Cognitive Neuroscience: One Concept a Day06/14/2026, 08:10:34 AM

Grid Cells: The Brain's Coordinate System

In 2005, Hafting, Fyhn, Molden, and the Mosers discovered neurons in the rat medial entorhinal cortex that fire in a perfect hexagonal lattice as an animal moves through space — grid cells. This article explains how grid cells work, what their three key parameters (spacing, orientation, and phase) mean, how they implement path integration through self-motion signals, how they interact with hippocampal place cells, and why the hexagonal firing pattern may be a general representational format the brain uses to organize not just space but abstract knowledge.

Cognitive Neuroscience: One Concept a Day06/13/2026, 08:11:18 AM

Place Cells: The Neurons That Know Where You Are

In 1971, John O'Keefe recorded from individual hippocampal neurons in freely moving rats and found cells that fired only at specific locations — place cells. This article explains what place cells are, how they form a cognitive map, what the 2005 discovery of entorhinal grid cells revealed about their upstream coordinate system, and why the place cell framework now extends far beyond spatial navigation into memory, episodic recall, and abstract cognition.

Cognitive Neuroscience: One Concept a Day06/12/2026, 08:11:36 AM

The Retrosplenial Cortex: Where Landmarks Find Their Place on the Map

The retrosplenial cortex (RSC) produces a distinctive navigation deficit: patients recognize every landmark but cannot use any of them to find their way. This article covers RSC anatomy (Brodmann areas 29/30 behind the corpus callosum), the landmark paradox from Maguire's 2001 lesion review, Epstein's 2008 PPA/RSC dissociation showing RSC tracks spatial knowledge of familiar places, the reference-frame translation hypothesis, Park & Chun's 2009 panoramic fMRI result, and why RSC appears in the default mode network alongside spatial memory and future planning.

Cognitive Neuroscience: One Concept a Day06/11/2026, 08:13:35 AM

The Occipital Place Area: Your Brain's Guide to Moving Through Space

Three scene-selective brain regions divide the work of scene perception — the OPA, named in 2013 after TMS evidence gave it a causal role, handles the local elements of visual scenes and the boundary information your brain needs to navigate through immediately visible space. This article covers its anatomy, the fractured-rooms experiment that revealed its local processing bias, the dynamic scenes result linking it to first-person locomotion, and the virtual-reality boundary navigation study that placed it at the perceptual origin of the spatial navigation circuit.

Cognitive Neuroscience: One Concept a Day06/10/2026, 08:16:46 AM

The Fusiform Body Area: The Brain's Neighbor to the FFA

Three millimeters from the fusiform face area sits a completely separate region for perceiving human bodies as wholes — the fusiform body area (FBA). This article explains how Peelen & Downing found it, how Schwarzlose, Baker & Kanwisher named it with high-resolution fMRI, and why it differs fundamentally from the EBA.

Cognitive Neuroscience: One Concept a Day06/09/2026, 08:15:09 AM

The Extrastriate Body Area: How the Brain Represents the Human Form

In 2001, Downing, Jiang, Shuman & Kanwisher discovered a patch of lateral occipitotemporal cortex that fires selectively to images of human bodies and body parts — the extrastriate body area (EBA). This article covers its location, what it responds to, what TMS disruption reveals about its causal role, how it relates to the nearby fusiform body area (FBA), and why its existence matters for theories of category-selective visual cortex.