Essentials: How Your Brain Functions & Interprets the World | Dr. David Berson
Andrew Huberman
Oct 16, 2025
Episode description
In this Huberman Lab Essentials episode, my guest is Dr. David Berson, PhD, a professor of neuroscience at Brown University and an expert on the visual system and circadian biology.We explore how the brain processes visual information, from photons entering the eye to conscious perception in the cortex. We discuss color vision, the discovery of melanopsin and intrinsically photosensitive retinal ganglion cells, and how light regulates our circadian clock and melatonin release. We also examine the vestibular system's role in balance and motion detection, the cerebellum's function in motor coordination, and the midbrain's integration of multiple sensory inputs. Finally, we discuss the basal ganglia's role in decision-making and an extraordinary case of neuroplasticity in visual cortex.Episode show notes: https://go.hubermanlab.com/kJOETdgHuberman Lab Essentials are short episodes focused on essential science and protocol takeaways from past full-length Huberman Lab episodes. Watch the full-length episode: https://youtu.be/oC3fhUjg30EWatch more Huberman Lab Essentials episodes: https://youtube.com/playlist?list=PLPNW_gerXa4OGNy1yE-W9IX-tPu-tJa7SFollow Huberman LabInstagram: https://www.instagram.com/hubermanlab Threads: https://www.threads.net/@hubermanlabX: https://x.com/hubermanlab Facebook: https://www.facebook.com/hubermanlab TikTok: https://www.tiktok.com/@hubermanlab LinkedIn: https://www.linkedin.com/in/andrew-hubermanWebsite: https://www.hubermanlab.com Newsletter: https://www.hubermanlab.com/newsletterDr. David BersonDr. Berson’s academic profile: https://vivo.brown.edu/display/dbersonEyewire (contribute to neuroscience research from home/computer): https://eyewire.org/exploreBest neuroscience textbook: https://amzn.to/4n87UoCWe Know It When We See It: What the Neurobiology of Vision Tells Us About How We Think (book): https://amzn.to/47qC9lUTimestamps00:00:00 Dr. David Berson00:00:38 Visual Perception, Photons & Retinal Processing, Ganglion Cells00:02:12 Color Vision, Wavelengths & Photoreceptors; Cones & Rods00:06:32 Melanopsin, Intrinsically Photosensitive Retinal Ganglion Cells & Brightness Detection00:08:45 Circadian Clock & Synchronization, Suprachiasmatic Nucleus (SCN); Master Clock Function00:11:30 Hypothalamus, Autonomic Nervous System & Hormonal Systems00:12:12 Tool: Light Exposure & Melatonin Regulation, Pineal Function00:13:06 Vestibular System, Balance & Motion Detection; Semicircular Canals00:15:45 Vestibulo-Ocular Reflex, Image Stabilization & Head Rotation00:17:22 Motion Sickness, Visual-Vestibular Conflict; Tool: Avoiding Nausea00:19:06 Cerebellum, Motor Coordination & Learning00:20:28 Cerebellar Function, Precision & Timing of Movement; Cerebellar Ataxia00:21:56 Flocculus & Visual-Vestibular Integration00:22:52 Midbrain, Brainstem & Reflexive Behavior; Superior Colliculus00:25:33 Spatial Orientation & Multisensory Integration; Rattlesnake Heat Detection00:27:20 Sensory Integration & Corroboration00:28:12 Basal Ganglia, Go vs No-Go Behavior & Decision Making00:29:15 Tool: Impulse Control & Delayed Gratification, Marshmallow Test00:30:13 Individual Differences, Genetics & Experience00:31:05 Visual Cortex, Neural Processing & Brain Plasticity00:32:00 Cortical Reorganization, Braille Reading & Stroke Recovery00:34:34 David Berson's Work; AcknowledgementsDisclaimer & Disclosures: https://www.hubermanlab.com/disclaimer
Mindsip insights from this episode:
Address insomnia linked to retinal blindness by understanding circadian rhythms
Patients with retinal blindness often suffer from insomnia because the light-sensing cells that synchronize the brain's 24-hour clock are damaged, causing their sleep cycle to drift out of phase with the day-night cycle.
Repurpose visual cortex to enhance tactile perception
In a person blind from birth, the visual cortex can be repurposed to process tactile information, such as remapping to the fingertips to read Braille.
Understand basal ganglia's role in impulse control
The basal ganglia are deep brain structures that control your ability to execute an action ('go') or withhold an action ('no-go'), forming the biological basis for impulse control.
Understand motion sickness as visual-vestibular conflict
Motion sickness is a 'visual-vestibular conflict' where your brain feels punished with nausea because your eyes and your inner ear report conflicting information about your body's movement.
Utilize light sensors in your retina to regulate circadian clock
Your retina has special cells, separate from those for vision, whose only job is to measure ambient light brightness to set your internal circadian clock.
Understand head bobbing in pigeons for stable vision
Pigeons and chickens bob their heads to keep the image of the world stable on their retinas for as long as possible, a strategy our own eyes use with rapid movements and pauses.
Avoid bright light at night to maintain melatonin levels
Turning on a bright light in the middle of the night will cause your melatonin levels to 'slam to the floor,' disrupting your hormonal state regardless of what you are consciously looking at.
Coordinate actions for effective motor learning with cerebellum
The cerebellum acts like an air traffic control system, not to initiate movement, but to coordinate and refine the timing and precision of actions, which is essential for motor learning.
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