Christian Rohrsen

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More on the attractor

on Monday, October 16th, 2017 2:26

Video of the attractor projected from a chunk of flight trace. Here one can see the difference in the trajectories of up- and down spikes. So here is another way of spike sorting by the way :).



Coloured traces depending where the locate in the attractor projection. Green means that they lie outside and when they stay with the PCs around zero its in red. The fly1r above does not look so clean as the v8 fly below (the cleanest measure I have)

SMAP results

on Monday, October 9th, 2017 2:34

These are the results of the SMAP for the TNTxWTB. I also have done a few for the c105;;c232xWTB but there is not much to say. I would say that the cleanest lines show a bigger slope, but prone to subjectiveness.

In addition, I have done some animations of the attractors that I have posted on slack because of size.

Attractors for c105;;c232>TNT

on Monday, October 2nd, 2017 5:35


This is what I showed about one fly from this line showing the attractor.

This graph is what I forgot to show in the lab meeting. There are the 6 best traces from this same line. All of them selected ad hoc subjectively. The three best of them to my eyes are exactly the three above in the graph (v8-this one is the one shown in the picture with the attractors-,v4,v2). What does this means? the ones with better traces (subjectively) have higher offset in the phi, this means that they are more predictable overall (maybe because more resolution?). In addition, they show higher slopes which means more nonlinearity.


thf1 line from screen

on Monday, July 17th, 2017 2:40

This is the first line I completed from the screen. What it is more important is that I found out that NorpA;UAS-Chrimson has orange eyes, when it should be red. So I think I will start to do the line again and meanwhile test the contaminated line to see what the phenotype looks like

Looking for students

on Monday, June 19th, 2017 6:01

We need a student to finish up experiments

Measuring locomotion in the Joystick? Something seems to happen…


Example of ON/OFF traces.  And then the wiggling was measured in both conditions (with and without light). It seems like they move more when they are in the light side. I also did measure the derivative with a tau=2 (in case the sampling is over the temporal frequency of fly behavior)

Comparing T- and Y-maze

on Monday, June 12th, 2017 2:59

Comparing scores in both setups show some lines that match their scores and other lines that have opposite scores. This filters the ones that are context dependent to the ones that show a context independent reinforcement valence.

Optimizing the Joystick with Gr28bd+TrpA1>Chrimson

on Monday, May 29th, 2017 12:58

It seems that there is something more there. There were 5 batches of 3 flies per side reinforced. I put the intensity higher than ever before. I will try to get the maximum intensity for the next experiment and see what it looks like.

Looking for the phenotype in Gr28bd+TrpA1>Chrimson

on Monday, May 22nd, 2017 3:01

I have decreased the light intensity to around half of what it previously was. The result do not show any clear phenotype. The ‘logical PI’ looks kind of inverted because I actually have plotted it so that positive means light, negative means no light. A total of 30 flies were tested: some of them with right, other with left reinforcement

Writting the analysis for the joystick experiments with Gr28bd+TrpA1>Chrimson

on Monday, April 24th, 2017 1:49

Example of a trace within the different trainning/test segments

Inter sampling interval just to check

10 experiment segments with alternating no reinforcement/reinforcement

The same as above but for the 3 platforms that ran in the same batch

Trace dynamics when the light is ON (blue) and OFF (red). Working on nicer visualization in general