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Michael Bach
407 followers -
Personal interests: Life. Professional interests: All things vision.
Personal interests: Life. Professional interests: All things vision.

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HTTP → HTTPS

Switched my entire site, namely this
https://michaelbach.de/ot/
fully to HTTPS. Wasn't as difficult as I thought, since my provider (Netbeat) provided certificate etc., and here
https://simonecarletti.com/blog/2016/08/redirect-domain-http-https-www-apache/
I found a good explanation of how to feed the Apache rewrite engine. Thanks!
Then I had to replace every pertinent link on my site, which could be largely automated.

Why did I go through this hassle? The web is a moving target. For instance, I had to port over 100 interactive illusion demos from ActionScript (Flash) to Cappucino (JavaScript), because fewer and fewer browsers and/or platforms support it. Sites w/o HTTPS will be ranked down by G. soon, Chrome will soon mark HTTP sites as "unsafe" (which most users will misinterprete), and HTTPS is necessary for the web speedup that HTTP/2 promises.
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Loss of contour in equiluminance

http://michaelbach.de/ot/col-equiluContour/index.html
On my site on visual phenomena & optical #illusions I added a new demonstration of the effect of equiluminance – here on contours.
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Pattern-ERG: P50 & N95 differ in LOCAL origin…
… as these mfPERG findings suggest:
Bach M, Cuno AK, Hoffmann Michael Bach (2018) Retinal conduction speed analysis reveals different origins of the P50 and N95 components of the (multifocal) pattern electroretinogram. Exp Eye Res 169:48–53.
Currently it is a free download here
https://authors.elsevier.com/a/1WVTB_L4uVOiC
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NO variant of the Café Wall Illusion – Skye's oblique grating

http://michaelbach.de/ot/ang-SkyeGrating/
In my #optical illusion collection I've added my take on Victoria Skye's current widely appreciated illusion. As I detail on my page, this is probably misattributed as a Café Wall Illusion variant. But it's very strong, nice!
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On our way to being an outcast when not facebooking
This excellent article is a concrete example what will happen if we don't be really careful. Also consider following the link to "ExtensionData Selfie".
I'm already a partial outcast in one of my bands because I don't use WhatsApp (where FB has openly lied to us with respect to data sharing).
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Red Strawberrries

http://michaelbach.de/ot/col-strawbsNotRed/
Amazing how things make the rounds on our asocial networks – now it's Kitaokas non-red strawberries, a strong colour-constancy demonstration. On my site on visual phenomena & optical #illusions I present the underlying colour distributions and debunk one possible explanation
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Life with USB-C is good
Ok, the weird part first: I have these 10-year-old LaCie FireWire speakers – They are really nice for watching movies, but 10 years ago it was FireWire 400. Then came FireWire 800 – the black adapter dealt with that. Then came Thunderbolt – that white adapter covered that – and the final white box now converts to the USB-C encased Thunderbolt. Through all these adaptors it works; who wo'd a thunk it?

Now the interesting parts: how to deal with loads of equipment using the USB A connector (at whatever speed) etc.

• Image 3 shows Apple's “reduced price” adaptor, which works fine. But that black one might interest you more: it costs 6€ for a pair, and does just as well. I found normal speeds for 5" external drives built for USB 3. The latter is so inexpensive, that one can just stick to all USB-A equipment such an adaptor and be done with it.

• Image 4 is Apple's Thunderbolt↔︎USB-C connector. Works well, but NOT FOR video! This will cause many problems: The Mini Display Port has exactly the same shape as Thunderbolt, but here it does not carry the same signals! More on that below. But it serves me well with Thunderbolt disks, and connecting in target-disk mode to another mac.

• Image 5 is a neat memory stick. It has a slider, letting you pushe out either USB-A or USB-C, so it fits just about everywhere.

• Image 6 is for connecting to video projectors. I do many presentations (715 and counting), and you never know what they have at that venue. The depicted device covers VGA and HDMI, and using and additional adaptor (image 7) I even can access DVI – so I'm covered for all eventualities.
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28/02/2017
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Opposite Rotation in Kitaoka's “Rotating Snakes Illusion”

Typically I would not advertise my scientific publications here, but I'm particulary proud of this paper “Rotating Snakes #Illusion—Quantitative Analysis Reveals a Region in Luminance Space With Opposite Illusory Rotation” (Lea Atala-Gérard & Michael Bach, 2017): https://doi.org/10.1177/2041669517691779

The standard rule of thumb is: the disk rotates from the black part over the darker grey towards the white part, as seen in the right disk (clockwise). The left one, although having the same black–dark grey–white–light grey order, rotates ever so slightly the other way. This is only a wee bit of rotation, but was totally unexpected. The luminance effect can be interactively explored here
http://www.michaelbach.de/ot/mot-snakesLum/
One needs to do eye movement beneath the figures to perceive the effect – steady fixation leads to steady disks. For me the rotation of the right disk is so strong that I need to cover it to see the occasional counter-clockwise rotation of the left disk.

We also, in the spirit of open data, have published our full data set on figshare. The data demonstrates that there is variability between observers. By using a nulling task (physical counter-rotation to make it seem stationary), quantification of effect strength was highly reproducible.
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