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THE NATURE OF MEMORY
Human memory depends on a complex mental system. There are three basic memory processes. Encoding transforms stimulus information into some type of mental representation. Encoding can be acoustic (by sound), visual (by appearance), or semantic (by meaning). Storage maintains information in the memory system over time. Retrieval is the process of gaining access to previously stored information. There are three types of memory: episodic memory, semantic memory and procedural memory.
Any memory of a specific event that happened while you were present is an episodic memory — such as what you had for dinner yesterday, what you did last summer. Semantic memory contains generalized knowledge of the world that does not involve memory of a specific event. Procedural memory, which involves the skill learning provides the memory for how to do things — how to ride a bike, read a map, or tie a shoelace. Often, a procedural memory consists of a complicated sequence of movements that cannot be described adequately in words. For example, the gymnast might find it impossible to describe the exact motions in a particular routine.
Many activities require all three types of memory. Consider the game of tennis. Knowing the official rules or how many sets are needed to win a match involves semantic memory. Remembering which side served last requires episodic memory. Knowing how to lob or volley involves procedural memory.
Memory is full of paradoxes. It is common, for example, for people to remember the name of their first-grade teacher but not the name of someone they met just a minute ago. Like perception, memory is selective. While people retain a great deal of information, they also lose a great deal.
Memory is intimately tied to many other aspects of psychology. Without memory, you would not know how to shut off your alarm clock, take a shower, get dressed, or recognize objects. 
Answer the questions:
1) What does human memory depend on? 
2) How many memory processes do you know? 
3) What does semantic memory contain? 
4) Is memory full of paradoxes? Why? 
5) Why do you think memory is selective? 

Give the summary of the text (5-7 sentences).