HCi and Senses and input output channels

Hci

1. HCI – Human Senses and Input/Output Channels Fundamentals of Human–Computer Interaction

2. What is HCI? Human–Computer Interaction is the communication between humans and machines. Focuses on designing effective and intuitive interfaces. Combines psychology, design, and computer science.

3. Human Input & Output Channels Input: Vision, Hearing, Touch (plus taste & smell). Output: Limbs, fingers, eyes, head, vocal system. Example: GUI → visual display, auditory cues, tactile interaction.

4. Vision (Physical & Perceptual) Light enters through cornea and lens, forming an image on retina. Rods: low light sensitivity; Cones: color and detail. Perceptual processing reconstructs meaningful images.

5. Visual Perception Depth, size, brightness, and color interpretation. Design Implication: high contrast, legible fonts, visual hierarchy.

6. Hearing (Auditory Perception) Ear processes pitch, loudness, and directionality. Supports audio cues and notifications. Used for accessibility: e.g., screen readers.

7. Touch (Haptic Perception) Skin receptors detect pressure, vibration, and texture. Haptic feedback in mobile devices (vibration). Assistive tech: Braille displays, tactile surfaces.

8. Examples of Multimodal Input Graphical User Interfaces (visual). Voice Commands (auditory). Touchscreens with vibration feedback (haptic).

9. Implications for HCI Design Design for sensory limitations. Use multimodal feedback to reinforce interactions. Ensure accessibility for all users.

10. Summary Human senses play a critical role in interaction. Vision, Hearing, Touch → guide interface design. Good design minimizes sensory overload and errors.