Agota Lang & Dora Horvath

Szechenyi Grammar School

Sopron, Hungary

2005 2005

CERNCERN

NEURONNEURON ++ DIODEDIODE

== NEURODENEURODE

Neuron: this is a typical conception in biologyDiode: 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 YOUHOW CAN YOU

MODELMODEL

NERVE-CELL?NERVE-CELL?

Studying of phenomena

Practical applying of model inside of validity limit

Choosing the significance properties

Building the model

Controlling the work of modelGiving validity limit

Outside of validity limit:improving and enriching of model

THE STEPS OF MODELLING:

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.

Illustration of nerve-cell

Photo of our nerve-cell model

Dendrites

Nucleus of cell

Cell-body

Axon

Synapsis

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.

rectifier diodes

resistances

LED

transistor

00 0

outputstimulating input

obstructiveinput

Circuit diadram of model

obstructive input LED

Groundinput

Stimulatinginput

Ground output

output

Photo sensor

Sound sensor Thermo 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).

The voltage in the stimulating input is less as the stimulus threshold (=opening voltage), the LED doesn’t light

The LED doesn’t light because the model becomes voltage in the obstructive input too

The voltage in the stimulating input is more as the stimulus threshold the LED lights

Modelling of stimulus threshold

Validity limit:

Our neuron-model has only 2 input and 1 outputIn reality every dendrits can work as a stimulating input or as an obstructive input tooStimulus 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.

There is nobody who helps so Garfield self goes to make dark

SOMEBODY LET 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: mmecurie@freemail.hu

Organizing the Physics-Run in the Forest

Organizing the Relay if Light between Sopron (H) and Neuseedler am See (A)

Demonstrating tricky physical experiment in the school yard

Roving in the History of natural Science with the pupils of Roving in the History of natural Science with the pupils of Széchenyi Grammar School, SopronSzéchenyi Grammar School, Sopron

Written and directed by meWritten and directed by me

On the Stage as Vogon Grandmother

Don’t Panic!

In directing

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: dooryh@gmail.com

If you are considerate you can find her on the photos too