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Okay, let's start. So last week we talked about generation of biomedical signals still,

and we talked about various biosignals that we cover in this short test.

So one of those signals that we talked about was the EEG, the electroencephalogram,

and during talking about the electroencephalogram we also talked about the,

in literature, defined brain waves that are important, that are typically analyzed,

and that people have investigated. Which are those?

Anybody wrote anything down?

Sorry? Oh, yeah, I was expecting your colleague to answer with alphabeta, gamma,

how many more letters of the Greek alphabet do you know? Theta and?

Delta, okay. Probably right.

So we have the delta wave.

Why did I write them like this and not in the order that the Greek alphabet gives?

Yeah? They are ordered by frequencies, right?

So what stupid idiot did it that way to start with delta? Yeah?

Right, it's as easy as that. Historically the alpha wave was reported first,

and they called it, we have discovered alpha. So they defined the alpha wave,

somebody else discovered beta, and described in literature, and so on and so forth.

So the lower frequencies that delta and theta represent were only later discovered.

That's the only reason. So for one of those brain waves you should know the ballpark frequency range.

You can also give me delta, but then I probably would have to look it up myself.

What's the alpha wave range? No, that is wrong.

Sorry? Seven to fourteen is okay.

Okay, so that would be sufficient. And in the real exome I would ask you then,

so what pathologies and what differentiations can you draw from analyzing the EEG waves?

So for example, the alpha wave has something to do with closing the eyes.

It's most visible in restful, awake humans and so on and so forth.

Second question. Which physiological function is measured by the electro-gastrogram?

Yeah, that's the smooth muscle of the stomach. So it's the working or smooth muscle of the stomach that are analyzed.

Third question. What's the three dimensions that play a role when you investigate event-related potentials?

And? Latency, amplitude and length, duration.

So the physical quantity is duration because duration is associated with time and length is associated with meters.

So it's a small but engineering important difference.

And the fourth question is a schematic drawing of the pressure curve of the carotid artery.

So whenever I ask you to make a drawing, please observe the engineering standards for making two-dimensional drawings.

So when you do a representation like this, you should have two axes that have an arrow.

You should have a description of what you actually see on the axis.

And you should give at least an indication of where you start and where you end.

So in pressure, I would start with maybe zero.

If we have that unit, go to 80 and 120. That could make sense.

So these are ballpark important numbers.

And now how would you make that drawing of the carotid artery pressure signal?

What are the important features of that?

One is for the systolic and one is for the diastolic, but you don't have a peak for the diastolic.

So the diastolic pressure is like the low point here.

And then it's right you have two peaks. So where are those peaks?

So where would you see the first peak and what number range?

The peak is not at 120.

80 is the diastolic pressure.

So I would see the first plateau somewhere here and then we have this peak.