Transcript motor nerve cell - jedlik.phy.bme.hu!

2005
Agota Lang & Dora Horvath
Szechenyi Grammar School
CERN
Sopron, Hungary
NEURON
+
DIODE
= NEURODE
Neuron: this is a typical conception in biology
Diode: this belongs to the area physics
What can we get if we add this two concepts?
The result of the addition is neurode: our model that models
nerve-cells.
HOW CAN YOU
MODEL
NERVE-CELL?
THE STEPS OF
MODELLING:
Studying of phenomena
Choosing the significance properties
Building the model
Controlling the work of model
Giving validity limit
Practical applying of model inside of validity
limit
Outside of validity limit:improving
and enriching of model
SENSORY NERVE CELL
INTERMEDIATE NERVE CELL
(INTERNEURON)
MOTOR NERVE CELL
.
The idea comes from the book The
computer an the Brain of John Neumann.
Our models show the physical working
of nerve-cells.
Dendrites
Nucleus of
cell
Cell-body
Axon
Synapsis
Illustration of
nerve-cell
Photo of our nervecell model
In effect the model is little circuit in a little toy (Duplo) cube. The circuit
contains diodes, transistor, LED and resistances. If a stimulus arrives in
the stimulating input, then the LED lights and comes up voltage in the
output. If a stimulus arrives in the obstructive input, then the LED lights
no more and there is any voltage in the output.
stimulating
input
obstructive
input
0
0
output
0
resistances
Circuit diadram of model
LED
transistor
rectifier
diodes
obstructive
input
LED
Ground
input
Ground
output
output
Stimulating
input
Sound sensor
Thermo sensor
Photo sensor
There’s 3 types of nerve-cells in biology, and we’ve got three kinds
of models too. These are the sensory nerve cell (these are photo,
thermo and sound sensitive ), the intermediate (relay) nerve cell and
the motor nerve cell (in this there’s really a little motor).
Modelling of stimulus threshold
The voltage in the stimulating input is
less as the stimulus threshold
(=opening voltage), the LED doesn’t
light
The voltage in the stimulating input is
more as the stimulus threshold the
LED lights
The LED doesn’t light because the
model becomes voltage in the
obstructive input too
Validity limit:
Our neuron-model has only 2 input and 1
output
In reality every dendrits can work as a
stimulating input or as an obstructive input too
Stimulus threshold dipents on the number of
stimulating signal
From this ready nerve cell models we built a chain that begins with
sensory nerve cell, then come 3-4 intermediate nerve cells and at the
end a motor nerve cell.
The neuron-chain at work in case of light
The neuron-chain at work in case of heat
The neuron-chain at work in case of sound
But there’s an important missing element without our model
couldn’t be a good nervous system model. This is called brain at
the full-blown organisms. Our model is the computer. It could
make a decission with a program in Microsoft Windows Logo. The
subject of the ready model is Garfield, the lazy cat. Normally it
dreams about a very big hamburger. If there’s something changing
in its surround, its dream is changing by this effect. So in case of
sound, it’s dreaming about a clock, in case of warm that’s a hearth,
and in case of light its dream is Sun. At the end of the experiment
Garfield wake up and go to the window to make dark.
Garfield’s reflection in case of heat.
Garfield’s reflection in case of sound
Garfield’s reflection in case of light
.
SOMEBO
DY LET
MAKE
DARK…
There is nobody who helps so Garfield self goes to make dark
Name: Ágota LANG
Time & place of birth: 24.03.1965 Szeged (Hungary)
Qualification:
physics, mathematics MSC at the University Szeged, 1988
Informatics MSC at the Eötvös Loránd University, 1998
Job: secondary school teacher
Place of work: Széchenyi István Grammar School, Sopron
E-mail address: [email protected]
Organizing the Relay if Light between
Sopron (H) and Neuseedler am See (A)
Organizing the Physics-Run in the Forest
Demonstrating tricky physical
experiment in the school yard
In directing
On the Stage as Vogon
Grandmother
Don’t Panic!
Roving in the History of natural Science with the pupils of
Széchenyi Grammar School, Sopron
Written and directed by me
I was awarded in 2005 by ERICSSON for my work in the
popularization of physics
That’s me in red in Technorama
(Winterthur /S/)
In the island Ven, where
Tycho Brache worked
On the Arctic Circle
For example in Berner Alps
Name: Dóra HORVÁTH
Time & place of birth: 12.05.1987 Sopron (Hungary)
Qualification:
Maturity at Széchenyi István Grammar School, Sopron
Job: student
Place of work: Budapest University of Technology
E-mail address: [email protected]
If you are considerate you can find her on the photos too