Related Experiment Video
Updated: Jan 27, 2026

16:49
Multifocal Electroretinograms
Published on: December 4, 2011
18.9K
Pathway-specific light adaptation in human electroretinograms.
Alódia Brasil1,2, Tina I Tsai2, Givago da Silva Souza1,3
1Biological Sciences Institute, Federal University of Para, Belém, Brazil.
Journal of Vision
|March 28, 2019
Summary
Slow electroretinogram (ERG) changes during light adaptation are clarified. Light adaptation primarily impacts the luminance pathway, with distinct responses observed for 12-Hz luminance stimuli.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Background:
- Cellular origins of slow electroretinogram (ERG) changes during light adaptation remain unclear.
- Understanding light adaptation is crucial for diagnosing visual pathway disorders.
Purpose of the Study:
- To investigate the cellular origins of slow ERG changes during light adaptation.
- To analyze the impact of different light stimuli on visual pathways.
Main Methods:
- Full-field ERG recordings in six healthy trichromats after 30 min dark adaptation.
- Sinusoidal stimuli isolating L- or M-cones, or stimulating luminance/chromatic mechanisms at 12/36 Hz.
- 16-min recordings with 2-min intervals under constant background illumination.
Main Results:
- First harmonic component dominated ERG responses, except for 12-Hz luminance stimuli showing transient components.
- First harmonic amplitude increased with adaptation time, except for 12-Hz luminance stimuli where it decreased.
- L/M ratio in luminance-reflecting ERGs decreased with adaptation time.
Conclusions:
- Light adaptation primarily involves changes within the luminance pathway.
- 12-Hz luminance stimuli responses are driven by two distinct luminance pathways with differing adaptation characteristics.
More Related Videos
Related Concept Videos
C4 Pathway and CAM
49.0K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
49.0K
Light Acquisition
9.4K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
9.4K
Light as Energy
95.7K
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
95.7K
Other Glycolytic Pathways
866
The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
866
Respiration Pathways
731
Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
731
Auditory Pathway
7.2K
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
7.2K

