Video Experimental Relacionado
Updated: May 14, 2026
11:24
Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
Published on: December 12, 2012
La codificación dendrítica de los estímulos sensoriales controlados por las interneuronas corticales profundas
Masanori Murayama1, Enrique Pérez-Garci, Thomas Nevian
1Physiologisches Institut, Universität Bern, Bühlplatz 5, CH-3012 Bern, Switzerland.
Nature
|January 20, 2009
Resumen
Las conductancias dendríticas activas en las neuronas piramidales de la capa 5 (L5) mejoran la potencia computacional. La inhibición controla la codificación sensorial por las dendritas piramidales L5, lo que permite la adaptación del rango dinámico lineal.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- La neurociencia computacional es la neurociencia computacional.
- La neurociencia celular es la neurociencia celular.
Sus antecedentes:
- Las conductancias dendríticas activas mejoran significativamente la potencia computacional neuronal y aumentan la actividad.
- Las neuronas piramidales de la capa 5 (L5) utilizan los canales de calcio dendríticos apicales para los potenciales de meseta, lo que influye en la ganancia de entrada / salida y el disparo de ráfagas.
Objetivo del estudio:
- Para investigar cómo varios insumos influyen en las propiedades dendríticas activas in vivo.
- Para explorar la codificación de la fuerza de estimulación sensorial en las dendritas piramidales L5.
- Para aclarar el papel de las neuronas inhibidoras en la modulación de la actividad dendrítica.
Principales métodos:
- Utilizó un nuevo método de fibra óptica para registrar los cambios de calcio dendrítico en las dendritas piramidales L5.
- Actividad registrada en poblaciones de dendritas piramidales L5 en ratas despiertas y anestesiadas.
- Se realizaron registros in vitro a partir de dendritas de un solo mechón apical.
Principales resultados:
- La intensidad de la estimulación sensorial está codificada de manera gradual por la respuesta del calcio dendrítico de la población de las células piramidales L5.
- Un subconjunto específico de neuronas inhibidoras, activado por las entradas sinápticas L5, controla la pendiente de la función estímulo-respuesta.
- La inhibición local a través de las interneuronas bloquea la iniciación del pico de calcio dendrítico en las neuronas piramidal L5 vecinas.
Conclusiones:
- Un microcircuito cortical en animales despiertos se basa en las propiedades activas de la dendrita piramidal L5 y la sensibilidad a la inhibición.
- Este microcircuito permite a las poblaciones locales de dendritas apicales codificar linealmente los estímulos sensoriales a través de su rango dinámico.
- El control inhibidor es crucial para la codificación sensorial adaptativa en los circuitos corticales.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:33Somatosensation
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:16Sensory Functions of the Skin
The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
01:28Integration of Synaptic Events
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
01:25Neural Circuits
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
01:11Sensory Perception: Organization of the Somatosensory System
The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...