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.

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Cognitive Neuroscience: One Concept a Day07/01/2026, 12:16:28 AM

Two Visual Streams: Why Seeing and Grasping Can Come Apart

The two visual streams hypothesis explains why the brain can recognize an object in one pathway while using another pathway to guide the hand toward it, from patient DF to the ongoing debate over visual illusions and grasping.

Cognitive Neuroscience: One Concept a Day06/30/2026, 12:25:16 AM

Face Inversion Effect: Why Upside-Down Faces Break the Brain's Shortcut

A concept guide to the face inversion effect: why turning a face upside down disrupts holistic and configural processing, what classic experiments showed, and how the finding connects perception, expertise, and face-selective cortex.

Cognitive Neuroscience: One Concept a Day06/29/2026, 12:25:21 AM

Covert Spatial Attention: Seeing Without Moving Your Eyes

Covert spatial attention explains how the brain can prioritize one part of the visual field before the eyes move. This article follows the idea from Posner's cueing task to biased competition in visual cortex and the frontoparietal systems that prepare and redirect attention.

Cognitive Neuroscience: One Concept a Day06/27/2026, 12:17:37 AM

Binocular disparity: how two eyes make depth

Binocular disparity explains how the brain compares the two eyes' slightly different images to recover depth, why random-dot stereograms changed the field, and why V1 disparity signals are only the start of stereoscopic perception.

Cognitive Neuroscience: One Concept a Day06/26/2026, 12:24:14 AM

Area MT/V5: How the Brain Sees Motion

Area MT/V5 shows how visual cortex turns noisy moving dots into a usable motion signal, and why lesion, recording, and microstimulation studies made it a model system for linking neurons to perception.

Cognitive Neuroscience: One Concept a Day06/25/2026, 12:22:54 AM

Cortical Magnification: Why the Brain Gives the Fovea More Cortex

Cortical magnification explains why central vision gets more cortical real estate than the periphery, linking V1 map geometry to acuity, receptive fields, and the way the brain allocates visual detail.

Cognitive Neuroscience: One Concept a Day06/24/2026, 12:17:43 AM

Receptive fields: the neuron's window on the world

Receptive fields explain how single neurons answer for specific parts of sensory space. This article traces the idea from Kuffler's retinal center-surround fields to Hubel and Wiesel's V1 edge-selective cells, then shows why context and feedback complicate the clean textbook diagram.

Cognitive Neuroscience: One Concept a Day06/23/2026, 12:28:01 AM

Ocular dominance columns: why V1 keeps the eyes partly separate

Ocular dominance columns are alternating zones in primary visual cortex where one eye has more influence than the other. This article explains the Hubel and Wiesel discoveries, why early deprivation can reshape the map, and how newer adult-plasticity work complicates the classic critical-period story.

Cognitive Neuroscience: One Concept a Day06/22/2026, 12:22:07 AM

Orientation selectivity: how V1 turns edges into signals

Orientation-selective neurons in V1 respond best to bars and edges at particular angles. This article explains the Hubel and Wiesel landmark experiments, the simple-cell edge-detector idea, modern debates about feedforward and cortical mechanisms, and why this concept matters for understanding how cortex builds visual features.

Cognitive Neuroscience: One Concept a Day06/21/2026, 12:14:35 AM

The BOLD Signal: What fMRI Really Measures

The BOLD signal is the vascular echo that makes fMRI possible: a delayed change in blood oxygenation rather than a direct recording of thoughts or spikes. This article explains the Ogawa 1990 discovery, early human fMRI, the hemodynamic response, and the limits of interpreting colorful activation maps.

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.