Introduction

May I steal your attention with this picture? What do you see? How your visions feel alike? Disturbed and unbalance right? Do you want to know what really happen just now? Don’t afraid, it is not because of your eyes. But, it is because of the interpretation made by your brain. Yes, your brain misinterprets it. This phenomenon is called optical illusion. Scientifically, optical illusion is defined as images perceived by our eyes, but which are different from the actual physical structure of the images. This illusion is classified into three types:

i) Literal illusion.ii) Physiological illusion.iii) Cognitive illusion.

These three types of optical illusion will be my main focus in today’s presentation.

Transition: There are a lot to be learnt from the different types of this illusion. So, now, allow me to begin with the first type, which is literal illusion.

1. Subproblem 1: Literal illusion It is defined as vision of creating images that are different from the object that make

them. Basically, it acts like an imaginary of unreal object. The illusion exists when the object is configured as an image that exactly doesn’t

exist there. That image is an illusion. The illusion exists since at the beginning which the illusion doesn’t change since

before.

Transition: As now, I am done presenting the first type of optical illusion; you’ll be pleased to continue learning the second type which is physiological illusion.

2. Subproblem 2: Physiological illusion It is occurs when the eyes or brain get excess stimulation. It is occurs when the reference of an object changes. The image is a kind of

afterimages because at first, the image is truly as what the object is. But, after the object is looked repeatedly, there exist excess stimulation which in sudden, the image change.

Brain will interpret the vision by referring the surrounding and then it affect the real object makes the object seem likes adapting to surrounding.

Transition: Here, I’m done with physiological illusion. Next, I am eager to present my last point on types of optical illusion which is cognitive illusion.

3. Subproblem 3: Cognitive illusion This is a very common illusion. This illusion is created by individual skill and knowledge. It is basically exist due to future assumption and expectation of something. When given some part of object, this illusion can created the whole image even the

object is not fully displayed.

Transition: As you can see, this cognitive illusion can be realized clearly from our daily life. Now, I am done with my last now, so, let me square away all of the points.

Conclusion

In his presentation, you had learnt about three types of optical illusion which are literal, physiology and cognitive illusion. We realize that we are experiencing so frequent this phenomenon, but, we should appreciate it as the uniqueness of the brain interpretation makes a view as beauty. I hope, with all what I had present today will being translated by you in real life, thus, makes life fun and interesting. Now, allow me to leaf. Thank you.

TITLE OF SPEECH

TYPES OF OPTICAL ILLUSION

NAME

MOHD FUAD BIN SARMAN

METRIC NUMBER

KEE 120026

GROUP NUMBER

K 27

SEMESTER/SESSION

2/ 2012/2013

CLASS TEACHER

MRS. LIM SING YUING

References

1. Dhanashree Patane (August 8, 2011), Types of Optical Illusions. Retrieved from http://www.buzzle.com/articles/types-of-optical-illusions.html

2. Scott Kessman (Jul 24, 2006), What is an Optical Illusion and How Does it Work? Discover How Optical Illusions Can Fool Your Eyes. Retrieved from http://voices.yahoo.com/what-optical-illusion-does-work-54414.html

3. Margot (March 31, 2011), Optical Illusions. Retrieved from http://margot3dms.edublogs.org/2011/03/31/optical-illusions/