Aattelin ekaksi laittaa Ulvilaan mutta enpa viitsi sotkea ketjuja. Jotenkin tulivat esim. nuo Zemin ja Turren Hake-nauhatulkinnat tasta tutkimuksesta elavasti mieleen:
Neural correlates of interspecies perspective taking in the post-mortem Atlantic Salmon:
An argument for multiple comparisons correction
Craig M. Bennett, Abigail A. Baird, Michael B. Miller, and George L. Wolford
METHODS
Subject. One mature Atlantic Salmon (Salmo salar) participated in the fMRI study.
The salmon was approximately 18 inches long, weighed 3.8 lbs, and was not alive at
the time of scanning.
Task. The task administered to the salmon involved completing an open-ended
mentalizing task. The salmon was shown a series of photographs depicting human
individuals in social situations with a specified emotional valence. The salmon was
asked to determine what emotion the individual in the photo must have been
experiencing.
Design. Stimuli were presented in a block design with each photo presented for 10
seconds followed by 12 seconds of rest. A total of 15 photos were displayed. Total
scan time was 5.5 minutes.
http://prefrontal.org/files/posters/Ben ... n-2009.pdf
Tassa selkokielisemmin mista on kyse:
Scanning Dead Salmon in fMRI Machine Highlights Risk of Red Herrings
BY ALEXIS MADRIGAL09.18.095:37 PM
When they got around to analyzing the voxel (think: 3-D or “volumetric” pixel) data, the voxels representing the area where the salmon’s tiny brain sat showed evidence of activity. In the fMRI scan, it looked like the dead salmon was actually thinking about the pictures it had been shown.
“By complete, random chance, we found some voxels that were significant that just happened to be in the fish’s brain,” Bennett said. “And if I were a ridiculous researcher, I’d say, ‘A dead salmon perceiving humans can tell their emotional state.’”
The result is completely nuts — but that’s actually exactly the point. Bennett, who is now a post-doc at the University of California, Santa Barbara, and his adviser, George Wolford, wrote up the work as a warning about the dangers of false positives in fMRI data. They wanted to call attention to ways the field could improve its statistical methods.
http://www.wired.com/wiredscience/2009/09/fmrisalmon/
Eli kun tarpeeksi tarkoilla laitteilla tutkii ja kunnolla ylitulkitsee, kuolleelta kalaltakin loytyy aivotoimintaa. Tassa lyhyesti suomeksi:
Tästä esimerkkinä oli tämän vuoden Ig-Nobel-palkinnon voittaja otsikolla Dead salmon brain scan. Jutussa oli havaittu satunnaisvaihtelusta johtuvaa aktiivisuutta kuolleen lohen aivoissa, ja vitsiä jatkettiin tieteelliseksi artikkeliksi asti (jossa lohi reagoi erilaisiin psykologisiin testeihin). Virheellisesti havaitun aktiivisuuden syynä on ns. multiple comparison testing-ongelma: kun tarpeeksi monta pikseliä verrataan kynnysarvoon, joku niistä sattuu ylittämään kynnyksen.
http://sgn-1251-s12.blogspot.com/2012/1 ... ttely.html
No toisaalta, CSI sai jo kenkää joten kaippa tämäkin, mitä väliä. annijatta osui pelottavan oikeaan! 