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THE INTRODUCTION - HUMAN AND COMPUTER BASICS
- 1. UNIT -1 THE INTRODUCTION – HUMAN AND COMPUTER
- 2. Introduction • Human-Computer Interaction (HCI) is a multidisciplinary field that studies how people interact with computers and other information technologies. • HCI researchers observe how people use computers and design technologies to improve the interaction between people and computers. • The goal of HCI is to make technology more user-friendly, efficient, and enjoyable.
- 3. INPUT/OUTPUT CHANNEL • Person’s interaction with outside world through input and output. • Interaction with computer output of computer - > input of the person Input of computer -> output of the person • Input in human occurs through five major senses Sight Hearing Touch Taste Smell
- 4. INPUT/OUTPUT CHANNEL • Output occurs motor control of effectors Limbs Fingers Eyes Head Vocal System • In interaction with computers – Fingers – Primary role – Typing /mouse control • Information received through sight which appears on the screen • Information also received through ears like beep sounds
- 5. Human Eye • Vision begins with light • Eye is the mechanism of receiving the light and transforming it into electrical energy. • Light is reflected from the objects in the world and their images focused upside down on the back of eye. • The receptors in the eye transform it into electrical signal and send to the brain.
- 6. Parts of Eye
- 7. PARTS OF THE EYE • The cornea in the lens at front of eye focus light into sharp image at back of the eye, the retina. • Retina is light sensitive and contains 2 types photo receptors – Rods and Cones. • Rods – highly sensitive to light – allows us to see under low illumination • Rods –unable to resolve fine details.this is reason for temporary blindness when we move from dark room into sunlight. • Each eye has 120 million rods situated towards edges of retina. • Rods dominate peripheral vision.
- 8. PARTS OF THE EYE cont. • Cones-second type of receptors • -Less sensitive to light than rods and tolerate more light • -Three types of cones-each sensitive to different wavelength of light. • This allows colour vision. • Eye has 6 million cones approximately.
- 9. HUMAN -VISION • Human Vision – Highly complex activities – Physical and Perceptual limitations • Visual perception – 2 stages – Physical reception of stimulus outside world – Processing and interpretation of stimulus
- 10. Visual perception • Visual perception is the ability to interpret the surrounding environment
- 11. READING • Reading -2 stages • -saccades(jerky movements) • -Fixations • Eye moves backwards and forwards called regressions. • Adult can read 250 words per minute
- 12. HUMAN EAR • Human ear comprises of three sections • -Outer Ear • -Middle Ear • -Inner Ear • Outer Ear – visible part of ear • Two parts – Pinna (structure attached to sides of head) • -Auditory Canal(sound waves passes to middle ear)
- 13. HUMAN EAR (cont.) • Outer Ear – two purposes • Protects middle ear from damage • Amplifies sound waves • Middle Ear-small cavity connected to outer ear by tympanic membrane or ear drum and inner ear by cochlea. • Sound waves passes through auditory canal and vibrate the ear drum – transmit the vibrations to cochlea and finally to inner ear. • Human ear can hear frequencies upto 20 HZ to 15 KHZ.
- 14. TOUCH • Touch provides us information about environment.
- 15. HUMAN MEMORY • Human memory is the ability to acquire, store, retain, and retrieve information. It's a crucial part of human cognition, allowing people to understand and behave in the present by drawing on past events. • Sensor Memory • Short term Memory • Long term Memory
- 16. HUMAN MEMORY • There are four main types of memory: • Sensory memory: Holds information from the senses for a brief moment • Short-term memory: Stores information for a short duration, usually a few seconds to a minute • Working memory: Processes and manipulates information in short- term memory, and retains it for longer • Long-term memory: Stores information for extended periods, such as personal experiences and learned facts
- 17. THINKING: REASONING AND PROBLEM SOLVING
- 19. PSYCHOLOGY AND THE DESIGN OF INTERACTIVE SYSTEMS
- 20. THE COMPUTER
- 22. POSITINING, POINTING AND DRAWING
- 23. PAPER: PRINTING AND SCANNING
- 24. MEMORY
- 26. THANK YOU