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Related Concept Videos

MOSFET01:16

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
Characteristics of MOSFET01:17

Characteristics of MOSFET

Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable quicker...
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...

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Related Experiment Video

Updated: Jul 1, 2026

Two-photon Calcium Imaging in Mice Navigating a Virtual Reality Environment
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FOS mapping reveals two complementary circuits for spatial navigation in mouse.

Edyta Balcerek1, Urszula Włodkowska1, Rafał Czajkowski2

  • 1Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warszawa, Poland.

Scientific Reports
|September 11, 2024
PubMed
Summary

Mice can learn foraging strategies using only external visual cues, utilizing either the hippocampus or retrosplenial cortex (RSC). This study reveals parallel spatial memory circuits in the brain.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Animal Behavior

Background:

  • Spatial navigation relies on integrating various sensory inputs.
  • The roles of the hippocampus and retrosplenial cortex in spatial memory are well-established but debated.
  • Understanding how animals adapt foraging strategies in dynamic environments is crucial.

Purpose of the Study:

  • To investigate if mice can develop foraging strategies based solely on external visual (allothetic) information.
  • To explore the involvement of the hippocampus and retrosplenial cortex in this adaptive learning process.
  • To differentiate the neural mechanisms underlying distinct spatial memory circuits.

Main Methods:

  • Development of a novel figure-8-maze apparatus with distinct contextual cues.
  • Implementation of behavioral protocols to train mice using only visual information for reward retrieval.
  • Utilizing c-FOS mapping to assess neural activity in the hippocampus and retrosplenial cortex.

Main Results:

  • Mice successfully shifted from an intrinsic alternation strategy to one based exclusively on visual context.
  • Two distinct training protocols induced this behavioral change.
  • Differential engagement patterns of the hippocampus and retrosplenial cortex were observed, suggesting distinct roles.

Conclusions:

  • Mice can learn complex foraging tasks using only allothetic cues.
  • Evidence supports the existence of parallel spatial navigation circuits: one hippocampal-dependent and another retrosplenial cortex-dependent.
  • These findings offer insights into the neural basis of adaptive spatial memory and behavior.