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The Retina

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Anatomy of the Eyeball

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...

Active Filters

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:

Visual System

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

Parallel Processing

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

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関連する実験動画

Updated: May 6, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

アダプティブフィルタリングは,視覚皮質の情報伝達を強化します.

Tatyana O Sharpee¹, Hiroki Sugihara, Andrei V Kurgansky

¹Sloan-Swartz Center for Theoretical Neurobiology, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, California 94143-0444, USA. sharpee@phy.ucsf.edu

|February 24, 2006

まとめ

脳内のニューラルフィルターは,視覚入力の変化に適応し,情報処理を最適化します. この適応は,表現不足の空間周波数に対する感受性を高め,自然シーンの神経コーディングを改善します.

さらに関連する動画

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Published on: December 8, 2023

関連する実験動画

Last Updated: May 6, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Published on: December 8, 2023

科学分野:

感覚神経科学は,感覚神経科学と関連しています.
計算神経科学とは
システム神経科学システム神経科学

背景:

神経コーディングの研究は伝統的に単純化された刺激を用いており,自然環境処理の理解を制限しています.
脳のコーディング戦略は,刺激の組み合わせによって決まるかもしれません.

研究の目的:

ニューラル・コーディング・ストラテジーは,異なる刺激・アンサンブルに適応するかどうかを調査する.
複雑な刺激からニューラルフィルターを計算するための新しい情報理論的方法を開発し,適用する.

主な方法:

偏りのない神経フィルター (受容場) の計算のための新しい情報理論的方法を適用しました.
自然のシーンとマッチングされた騒音刺激に対するネコの主要な視覚野のニューラル反応を記録した.
自然と騒音の入力への応答の間のニューラルフィルター特性を比較した.

主要な成果:

神経フィルターは,入力刺激の組み合わせに基づいて適応的に変化します.
この適応は,刺激に関する神経反応によって伝達される情報を強化する.
適応は,神経フィルターの空間的周波数組成を特異的に変化させ,表現不足の周波数に対する感受性を高めます.
観察された適応時間スケールは40秒から数分までで,以前報告されたよりも長い.

結論:

脳の神経フィルターは静的ではなく,感覚インプットの統計的性質に動的に適応します.
この適応フィルタリングメカニズムは,重要な刺激特性の表現を強化することによって,自然環境のためのニューラルコーディングを最適化します.
この発見は,最適なコーディング理論を支持し,より遅い,より持続的な神経適応の形態を明らかにします.