Human Computer Interaction Quiz

Human Computer Interaction

• Human capabilities involve information i/o, storage, processing, and application, influenced by emotions and individual differences.

Information Processing

• Information is processed and applied through reasoning, problem-solving, skill, and error.

Vision

• The human visual system consists of two stages: physical reception of stimulus and processing and interpretation of stimulus.
• The eye receives light and transforms it into electrical energy, focusing upside-down on the retina.
• The retina contains rods for low light vision and cones for color vision.
• Ganglion cells detect pattern and movement.

Interpreting Visual Signals

• Visual angle indicates how much of the view an object occupies, relating to size and distance from the eye.
• Visual acuity is limited and perceives familiar objects as constant size despite changes in visual angle.
• Cues like overlapping help perception of size and depth.
• Brightness is a subjective reaction to levels of light, affected by luminance, and measured by just noticeable difference.
• Visual acuity increases with luminance, as does flicker.
• Colour is made up of hue, intensity, and saturation, with cones sensitive to color wavelengths.
• The visual system compensates for movement, changes in luminance, and context to resolve ambiguity, but can lead to optical illusions.

Optical Illusions

• Optical illusions occur due to overcompensation, such as the Ponzo illusion and the Muller Lyer illusion.

Reading

• Reading involves several stages: visual pattern perception, decoding using internal representation of language, and interpretation using knowledge of syntax, semantics, and pragmatics.
• Reading involves saccades and fixations, with perception occurring during fixations.
• Word shape is important to recognition, and negative contrast improves reading from computer screens.

Hearing

• Hearing provides information about the environment, including distances, directions, and objects.
• The physical apparatus of hearing includes the outer ear, middle ear, and inner ear, which transmit sound waves as vibrations to the inner ear.
• Sound is characterized by pitch, loudness, and timbre.
• Humans can hear frequencies from 20Hz to 15kHz, with less accuracy distinguishing high frequencies than low.
• The auditory system filters sounds and can attend to sounds over background noise, such as the cocktail party phenomenon.

Touch

• Touch provides important feedback about the environment, particularly for those who are visually impaired.
• Stimulus is received via receptors in the skin, including thermoreceptors, nociceptors, and mechanoreceptors.
• Some areas are more sensitive than others, such as the fingers.