Characteristics of teachers' perception of preparing for exams.

2. The greater the difference and contrast between the object and the background, the easier it is for the object to be perceived, such as a little red in the evergreen bush, words written on the blackboard with white chalk, and the telephone ringing next door in the dead of night; On the other hand, it is not easy to be perceived, such as white bears in the ice and snow, soldiers hiding in the grass in camouflage uniforms, and pagers in noisy markets.

3. When objects are relatively moving and the background is relatively motionless, or when objects are relatively motionless and the background is relatively moving, objects are also easily perceived, such as meteors in the night sky and people who don't open their mouths when singing.

4. When the object is something you are familiar with and interested in, or related to people's needs, wishes and tasks, it is also easy to be perceived, such as hearing someone calling his name in a noisy environment and finding the book you need quickly in a bookstore.

Fourth, perseverance

Definition: When the objective conditions change within a certain range, our perceptual image maintains its stability to a certain extent.

1. Brightness and color constancy:

Whether we look at a white shirt indoors or outdoors, we always perceive it as the same white; Under strong light, the light reflected by coal is far greater than that reflected by chalk in the dark, but we still feel that coal is black and chalk is white.

2. Shape constancy:

A disk, no matter how it tilts and rotates, may actually be an ellipse or even a line segment, and we will regard it as a disk; No matter from the front or the side, the shape of a bus we perceive will not change.

3. Constant size:

Most teachers stand on the platform when giving lectures, and sometimes walk to the students' seats. When teachers are in different positions in the classroom, their image size is different in the eyes of students, but the size of teachers in the eyes of students is the same.

Below, we will strengthen the learning content just now through examples:

At a glance, the whole leopard embodies the characteristics of perception.

A. Comprehension B. Integrity C. Selectivity D. Constancy

Answer B. Analysis: The whole embodies the relationship between parts and the whole, and a glimpse shows that the whole leopard embodies the characteristics of the whole.