Lec2 - Model Human Processor

Question 1

Humans as information processing

Answer 1

Perception (senses)
Cognition (process info based on existing knowledge)
Motor action (info output)

Question 2

Model human processor

Answer 2

Perceptual (100ms for one cycle)
Cognitive (70ms)
Motor (70ms)

Range of numbers as every human is different

Question 3

Processors and memory

Answer 3

Perceptual -> visual and audio store in working memory
Cognitive-> bidirectional between long term and working memory
Motor -> from working memory to motor processor

Question 4

Perceptual

Answer 4

Split into memory and processor
Turns external events into form that can be handled by cognitive. Coding is influenced by attention, type of coding influenced by gestalt and associations.
Buffer for sensory data
Visual data is stored for 200ms and audio for 1500ms.

Processor
Multiple similar events are integrated by Blochs law
R = Ixt
Perceiving two short stimuli as one of twice the intensity

Question 5

Cognitive

Answer 5

Composed of working memory, long-term memory and cognitive processor.
Processes perceived info and decides how to act.
Based on recognise-act style. Recognition being parallel but action being serial.

Uncertainty Principle
Decision time increases with uncertainty about judgement, as more cycles needed.

Question 6

Motor

Answer 6

Thought into action.
240 ms for person to press button once they’ve seen visual stimulus.

Question 7

Time scales of human action

Answer 7

Time on logarithmic scale (see slides for table).
Social band -> goals
Rational band -> tasks scaled
Cognitive band -> unit tasks (e.g. googling)
Biological band -> what’s going on inside head

Question 8

Responsive system

Answer 8

Perceived as responsive if complies with time requirements:

<0.01s controlling in real time
<1s computer under our control
>=10s frustration and memory decay