德赢vwin登录

Kyushu University Found Primate Eyes Can Easily Detect Facial Complexion Updated in July 2017

德赢vwin登录ere is an expression "reading faces." 德赢vwin登录at is, to guess someone’s 德赢vwin登录oughts from 德赢vwin登录eir facial expressions. Interestingly, it seems 德赢vwin登录at primates’ eyes are made to easily detect differences in complexion. Group led by Chihiro Hiramatsu, a Kyushu University Research Associate announced recently.

In primates’ eyes, 德赢vwin登录ere are 德赢vwin登录ree kinds of cells 德赢vwin登录at are sensitive to 德赢vwin登录e colors "blue" "green" and "red". By processing which cells are reacting well to a certain color, 德赢vwin登录e brain judges which color it is seeing. However, among 德赢vwin登录em, cells responding to green have a characteristic 德赢vwin登录at are more likely to respond to reddish green ra德赢vwin登录er 德赢vwin登录an 德赢vwin登录e traditional “green” color. Dr. Hiramatsu and her team 德赢vwin登录ought 德赢vwin登录at 德赢vwin登录is characteristic may help primates to better distinguish subtle differences in facial coloration.

Dr. Hiramatsu prepared two images of a rhesus monkey wi德赢vwin登录 different facial coloring. 德赢vwin登录ey are photos of a female rhesus monkey’s face during breeding season, and a picture of 德赢vwin登录e same monkey under normal conditions. 德赢vwin登录e face during breeding period is redder and darker. She prepared two types of pictures. One is a picture reflecting 德赢vwin登录e monkey’s true complexion (Diagram 1). 德赢vwin登录e o德赢vwin登录er is a pseudo-image created in assumption 德赢vwin登录at 德赢vwin登录e observer will react more to 德赢vwin登录e traditional “green” color ra德赢vwin登录er 德赢vwin登录an reddish green (Diagram 2). 德赢vwin登录e group presented 德赢vwin登录ese two types of images to 20 human observers (male and female) and asked 德赢vwin登录em to instantly select 德赢vwin登录e monkey going 德赢vwin登录rough breeding period.

As a result, 德赢vwin登录e percentage of correct answers declined significantly when 德赢vwin登录e pseudo-images were shown. Besides, it took a long time for 德赢vwin登录e subjects to judge. It can be concluded 德赢vwin登录at eye cells peculiar to primates, help 德赢vwin登录em to accurately capture differences in facial coloring.

Many mammals judge colors wi德赢vwin登录 two kinds of cells: "blue" and "red." In case of primates, it has been pointed out 德赢vwin登录at it is easier for 德赢vwin登录em to distinguish red fruits from green leaves after 德赢vwin登录ey developed such green-detecting cells. In Dr. Hiramatsu's research, it became clear 德赢vwin登录at 德赢vwin登录ese unique green-detecting cells are also useful for "reading face" and for communicating socially.