Hippocampal Electrodes
Hippocampal Electrodes - Related Videos
09:48
Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array
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Cited by 2 •
2015
We have developed an in vitro unfolded hippocampus which preserves CA1-CA3 array of neurons. Combined with the penetrating micro-electrode array, neural activity can be monitored in both the longitudinal and transverse orientations. This method provides advantages over hippocampal slice preparations as the propagation in the entire hippocampus can be recorded simultaneously.
02:30
Optogenetic Control of Hippocampal Network Dynamics
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2025
This video demonstrates the method to use optogenetics to modulate hippocampal network dynamics by activating genetically modified light-sensitive interneurons in a mouse brain slice, enhancing theta oscillation synchronization and studying neural circuit behavior.
08:20
Organotypic Hippocampal Slice Cultures
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Cited by 52 •
2011
We describe a method to prepare organotypic hippocampal slices that can be easily adapted to other brain regions. Brain slices are laid on porous membranes and culture media is allowed to form an interface. This method preserves the gross architecture of the hippocampus for up to 2 weeks in culture.
05:36
Implantation of an Electrode Assembly in a Mouse Brain for Electrophysiological Recording
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2025
This video demonstrates a technique for implanting an electrode assembly into a mouse brain. The assembly contains bipolar electrodes to record activity from the hippocampus and a reference electrode to obtain baseline activity from the cerebellum. An anesthetized mouse is placed on a stereotaxic frame, and the electrode assembly is implanted in the target brain region. The animal is then allowed to recover before performing electrophysiological recording.
03:02
Standard Electrode Potentials
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2020
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
FAQs
The recorded signal can be examined at two complementary levels. Field-potential analysis captures voltage changes generated by groups of nearby neurons, revealing broader network dynamics. In contrast, analysis of individual neuronal firing patterns focuses on the activity of particular cells. Using both views helps relate collective hippocampal states to the responses of individual neurons during memory and navigation studies.
Field potentials describe coordinated electrical changes across neuronal populations, whereas firing-pattern analysis tracks activity attributed to individual neurons. These measurements answer different questions: population signals help characterize network dynamics, while firing patterns can reveal how particular cells participate in memory encoding or spatial representations. Comparing both forms of data provides a more complete account of hippocampal activity.
Stimulation delivers controlled electrical pulses to modulate activity in local hippocampal circuits. This creates an experimental contrast with passive recording, which observes naturally occurring voltage changes without intentionally altering the circuit. Researchers can therefore examine how changing local activity relates to hippocampal function, while recordings provide measurements of the resulting electrical responses and network dynamics.
The hippocampus contributes to spatial navigation, and electrode recordings can reveal activity patterns associated with that function. Place-cell activity offers a cellular-level view of how particular neurons participate in spatial representations, while broader recordings show related network dynamics. Together, these measurements connect electrical activity with the neural processes underlying navigation and memory formation.
Experiments can provide field-potential measurements, individual neuronal firing patterns, and information about responses to controlled electrical stimulation. These outputs allow researchers to investigate memory encoding, place-cell activity, network dynamics, and seizure-related activity. The resulting data can also help connect local hippocampal electrical behavior with broader questions about neurological disorders and neural-interface development.
In neurological-disorder studies, recordings can help researchers examine seizure-related activity and other changes in hippocampal electrical behavior. The same electrode-based approach supports development of neural interfaces intended to improve understanding of hippocampal function. By combining observation of electrical signals with controlled modulation, these studies may inform future therapeutic strategies without treating the experimental device itself as a therapy.