MIT Massachusetts Institute of Technology

Do You See a Ghost? The Relationship between Afterimage And Color Sensors in Humans

Tetsuo Takaishi and Daisuke Sugawara
Biology Teachers
Higashi-Katsushika High School
Kashiwa City
Chiba, Japan


高石 哲男,菅原 大介
東葛飾中学校・高等学校   生物学教師

This lesson teaches human vision through some afterimage phenomena. It aims at two types of learning objectives. One goal is for students to learn about the stimulation of the cone cells. A second goal is for them to acquire skills necessary to explain to others their views in an understandable way. The students do not need to study anything in advance to take this lesson. All materials required for this lesson are available on the web site of MIT BLOSSOMS. This lesson takes about 45 minutes. In this lesson, students will have activities such as experimenting with afterimages, group discussions about the experiment and presentation of the results.


Mr. Takaishi is a teacher of biology at Higashi-Katsushika Junior and Senior High School. He has been working hard for students' themed research projects.

Mr. Sugawara is a teacher of biology at Higashi-Katsushika Junior and Senior High School. He was in charge of editorship for a TV lecture provided by Japan Broadcasting Corp.



This site, sponsored by the Arizona State University School of Life Sciences, entitled “Seeing Color” provides an excellent discussion about the workings of the rods and cones of the human eye.

This site provides a short TED Ed video on how humans are able to see color.

This site is a Wikipedia discussion of Afterimages and touches on the relationship to color.


こちらは教育向けの TEDのビデオで、人がどのようにして色を見分けることができるかについて語られています。


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This Lesson is in the following clusters: Human Anatomy