Light-induced Currents
Light-induced Currents - Related Videos
19:33
Whole-cell Recordings of Light Evoked Excitatory Synaptic Currents in the Retinal Slice
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Cited by 2 •
2008
This video shows the process of whole-cell voltage clamp recordings in the retinal slice of the aquatic tiger salamander. We demonstrate the preparation of the slice as well as how to perform patch clamp recordings during visual stimulation of the retina.
07:24
Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Cited by 2 •
2015
A simple protocol for the preparation of reduced graphene oxide using visible light and plasmonic nanoparticle is described.
09:08
Rapid Optimization of a Light-Inducible System to Control Mammalian Gene Expression
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Cited by 1 •
2025
This study describes a method for high-throughput experiments using a 3D-printed LED array to optimize light-inducible gene expression in HEK293T cells.
02:23
Quantification of Light-Induced Bacterial Inactivation Through Reactive Oxygen Species Generation
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2025
Source: Cheng, C., et al. Inactivation of Pathogens via Visible-Light Photolysis of Riboflavin-5′-Phosphate. J. Vis. Exp. (2022).In this video, a buffered reaction mixture containing L-methionine, nitro blue tetrazolium (NBT), and flavin mononucleotide (FMN) is irradiated with violet light to induce reactive oxygen species (ROS) production. This leads to bacterial inactivation and the formation of spectrometrically detectable formazan.
07:32
Whole-cell Currents Induced by Puff Application of GABA in Brain Slices
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Cited by 2 •
2017
We describe the puff technique, by which pharmacological reagents can be administered during whole-cell patch-clamp recording, and highlight various aspects of the features that are crucial for its success.
FAQs
Channels and pumps alter membrane conductance when illumination changes their activity, but the resulting ion movement can drive opposite electrical effects. Depending on the light-sensitive mechanism and ion flow, the membrane may depolarize, making neuronal activation more likely, or hyperpolarize, promoting silencing. This distinction determines whether light is used to excite or inhibit a selected neuronal population.
The response reflects the light-sensitive mechanism, the change in membrane conductance, and the direction of ion movement across the neuronal membrane. Illumination can therefore generate a measurable photocurrent with either depolarizing or hyperpolarizing effects. Because light can be delivered with precise timing, investigators can relate the current to neuronal activity and examine how responses contribute to neural computation.
Light-induced currents in neuroscience primarily track ion movement across a cell membrane, whereas light-sensitive materials may generate directed electron movement. The shared principle is photon-driven charge transport, but the measured biological consequence is a change in neuronal membrane conductance and activity. This distinction helps researchers interpret photocurrents as signals linked to neural function rather than as generic material responses.
An electrophysiology workflow pairs illumination with electrical recording from the neuron or preparation under study. Investigators apply light to engage the relevant light-sensitive molecules, observe the resulting photocurrent, and analyze how the membrane responds. These measurements can characterize membrane properties while showing whether the response is depolarizing or hyperpolarizing, connecting the molecular light response to electrical behavior.
Optogenetic control uses the sign and timing of the light-evoked response to influence selected neurons. A depolarizing current can activate a targeted population, whereas a hyperpolarizing current can silence it. By controlling when illumination occurs and directing it toward the relevant cells, researchers can test how particular neurons contribute to activity with precise temporal control.
Recordings of these currents can help map circuit connectivity by linking a light-evoked response to activity within connected neural elements. The same approach supports sensory-processing studies, where the timing of neuronal responses is important, and neurological-disease research, where circuit activity can be examined. Photocurrent measurements therefore connect molecular light sensitivity with circuit-level questions.