1.1.4 Sensory transduction-I

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Del curso dictado por Peking University

Advanced Neurobiology II

53 calificaciones

Peking University

Advanced Neurobiology II

53 calificaciones

Hello everyone! Welcome to advanced neurobiology! Neuroscience is a wonderful branch of science on how our brain perceives the external world, how our brain thinks, how our brain responds to the outside of the world, and how during disease or aging the neuronal connections deteriorate. We’re trying to understand the molecular, cellular nature and the circuitry arrangement of how nervous system works. Through this course, you'll have a comprehensive understanding of basic neuroanatomy, electral signal transduction, movement and several diseases in the nervous system. This advanced neurobiology course is composed of 2 parts (Advanced neurobiology I and Advanced neurobiology Il). They are related to each other on the content but not on scoring or certification, so you can choose either or both. It’s recommended that you take them sequentially and it’s great if you’ve already acquired a basic understanding of biology. Thank you for joining us!

De la lección

Perception: Vision

1.1.1 Ways to sense the environment-I10:18

1.1.2 Ways to sense the environment-II11:57

1.1.3 Ways to sense the environment-III8:24

1.1.4 Sensory transduction-I9:04

1.1.5 Sensory transduction-II9:12

1.1.6 Sensory processing9:12

1.1.7 Sensory representation in the brain4:57

1.1.8 Vision15:58

1.1.9 Single-photon detection16:44

1.1.10 Second messengers8:35

Conoce a los instructores

Chenjian Li
Professor
School of Life Sciences
Donggen Luo
Research Fellow
School of Life Sciences
Yan Zhang
Professor
School of Life Sciences, Peking University

Let's take a look.

For us humans, then, what's the sensory system we have?

[FOREIGN] Of course,

this is your visual system.

And then, if enjoy the flavor of this wine,

or it has a good sense of smell, this olfaction.

And of course, then the flavor of this delicious fruit,

then it's using your sense of taste.

[FOREIGN] And of course, if you listen to the music,

then it's through the sense of audition.

It's a hearing, timbre,

and also the touch is one of

the five basic senses, right?

For this five basic senses,

the principles underlying this thing,

let's take a look.

You're kind of appreciative of the pictures,

kind of enjoy the flavor, or when you enjoy the music.

All begins with the physical stimuli, actually you need

to transduce into electric signal that our brain can understand.

Okay, this is the first step, this step is called sensory transduction.

This is [FOREIGN].

Now it's a from the physical or chemical stimuli.

Then transduced into

electric signal [FOREIGN].

Now let's take a look, in the visual system, of course,

this is achieved by the eye.

[FOREIGN].

So for the smell,

then you have

the chemical

coming [FOREIGN].

For the taste, of course, it's the use of the tongue.

[FOREIGN] taste bud.

[FOREIGN] detect bitter.

[FOREIGN].

In most cases, actually, bitter is associated with the toxin.

[FOREIGN].

Now, of course then sweet.

[FOREIGN].

Okay, so this is actually the taste, the system,

also transduced, those chemicals actually into

the electrical system by the tongue, the taste bud.

And the difference between these two, what's the difference?

Smell and the taste.

Make it more specific.

Both are chemical receptors, those detect chemicals.

[FOREIGN] What's the difference between these two types of chemicals?

Smell and taste.

>> [INAUDIBLE] >> Okay,

that's a good question, good answer.

So smell, then is to

detect those chemicals,

can [FOREIGN].

[FOREIGN].

This distinction,

[FOREIGN] taste system [FOREIGN]

detect easier is a chemical.

[FOREIGN].

All right, so the other one that's basically most

actually the physical stimulation, like the touch.

[FOREIGN].

So it doesn't matter, okay?

So the sensor system, you need the first step.

[FOREIGN] sensory organ.

[FOREIGN].

Okay, so

first actually we talk about the sum of these principles under the sensory system.

[FOREIGN].

Now one important concept is the receptive field.

Now

[FOREIGN]

specifically

the

neuron,

[FOREIGN].

The neuron can be excited.

[FOREIGN]

or inhibited,

[FOREIGN].

Spacial domain, [FOREIGN] you can change the firing of the neuron.

[FOREIGN]

excitation.

You decrease the [FOREIGN] okay?

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