Motor Control

1
Motor Control

• Movement Time (Fitts Law)
• MT a bID
• ID log2(D/W)
• Motor programs
• Open looped ballistic (no feedback)
• Closed looped guided by feedback

2
Psychological Refractory Period

• Attentional limitation not a perceptual
  limitation (occurs even as multi-modalities)
• 2 signals compete with each other
• Can not respond to the second signal until you
  finish responding to the first
• Thus, delay in the RT for the second signal
• Only occurs at a critical inter-stimulus interval
• What happens when the ISI is longer?
• What happens when the ISI is shorter?

3
Stroop Effect

• White
• Blue
• Green
• Red
• Yellow
• Brown
• Orange

Red Yellow Blue Green Orange White Brown
Green Brown White Red Yellow Blue Orange
4
Attention

• Broadbents early selection model

Sensory Store
Filter
LTM
Semantic Processing
5
Attention

• Duetsch/Normans late selection model

LTM
Sensory Store
Filter
Semantic Processing
6
Attention

• Triesmans early selection model

LTM
Sensory Store
Attenuator
Dictionary
7
Divided Attention

• The previous models are structural models usually
  describing attention as a bottleneck
• Kahnemans single resource model

Task A 50 units
Resource pool
100 units
50 units left
20 units left
OVER THE LIMIT
Task B 30 units
Task C 70 units
8
Divided Attention

• Wickens multi-resource model
• Separate resource pools for each
• modality visual, audition, tactile, olfactory,
  taste
• code spatial vs. verbal
• response motor vs. verbal

Visual pool
Audition pool
Tactile pool