The IQ of a banana is more than 0

http://psychology.about.com...For some reason, additional characters were added at the end of the web address, makingit point to a different web page. My apologies. I should have checked whether the link works. Anyway, we agree that the modern way of calculation the IQ (using mean 100 and standard deviation 15)is the best way. The "mental age" definition does not make much sense. For example, a dumb 40-year oldwho has the intelligence of a senile 120 year old, would have an IQ of 120/40*100=300. Brain of a bananaFor the "mental age" definition, the IQ of a banana may not make sense if we can establish that a bananadoes not have a brain. However, I think a brain is not needed for the modern definition of the IQ. To measure an IQ, one has to participate in a standardized test. However, it is possible to perform worse than a banana. For example at an SAT test, you're score for a question is 0 if you don't answer it. It is 1 if you answer it incorrectlyand you get a negative score for wrong answers. Most of the time, bananas score 0 on such a test, but some people scorebelow that. Scoring 0 on an SAT test or an intelligence test does not mean that your IQ is 0 though. Remember thatthe IQ is defined in terms of how you score relatively to the adult human population. Still, I do not agree that bananas do not have brains. The resolution of your image was too low for me to recognize that there were only 2 bananas, of which one was cut open. To me it just seemed to be 3 bananas. The resolution is also too low to recognize, whether the inside of the banana is a brain or not. It doesn't quite look like the inside of a walnutor like the human brain. But for example, if you compare the inside of a banana with the brain of a mouse, a rat oreven a rabbit, then it does not look that different as the following image shows:. http://c431376.r76.cf2.rackcdn.com...The human brain (and the walnut's brain) have lots of folds, whereas the brain of a rat looks more like a piece of fruit. My opponent wrote:" I concluded that a scan is needed to find a banana's IQ, and without a brain, a scan would be fruitless and yield NO results of electrical signals being transmitted through a central processing unit commonly known as a brain. "My opponent argues, that, if a banana has no brain, then a brain scan of a banana would be fruitless. It is well known that banana's are fruits. So any brain scan of a banana is fruitful, not fruitless. The logical conclusion isthat bananas do have brains. It should also be pointed out that not all humans are smarter than bananas. Banana's don't talk. But sometimesbeing silent makes you smarter. Look at the video. . http://www.youtube.com...then look at this banana:. http://www.fakingnews.firstpost.com...Now, which one looks more intelligent to you? I think for some people, going bananas is a step up. Calculation of IQBananas and people in permanent vegetative states have similar scores on IQ tests. I should not have assumed that bananasare in the upper end of this spectrum as my opponent points out. More reasonable would be to assume thatthere score average among this group. In that case, the fraction of the population with an IQ less or equal than a bananais roughly 1/40,000. Doing the same calculation as before we getPhi((y-100)/15)=0.000025. (y-100)/15=-4.0556y=15*(-4.0556)+100=39.165So the IQ of a banana is about 39. This likely will not satisfy my opponent. So let us for the moment assume that a banana scores as badly as the stupidest person on earth. Let's say there are 7,136,000,000 people. . http://en.wikipedia.org...Phi((y-100)/15)=1/7,136,000,000 (It's kind of hard to solve this with a regular calculator, I used MATLAB)(y-100)/15=-6.306y=15*(-6.306)+100=5.41So even under this assumption, the IQ of a banana is more than 5! Finally, we talking about human IQ. We are just looking what the human-IQ of a banana is. Adding the whole bananapopulation to the human population would change the definition of an IQ. Since there are many more bananas than people,basically we would get the "banana-IQ". So a banana has a banana-IQ of 100, but humans have a banana IQ of 200 or maybe 300. (I don't have the energy to compute it now though. )