Cognitive fMTP

• Preparation effects manifest in the motor system
• Preparation is a balance between inhibition and activation
• A neural representation of time
• A (crude) model of the motor system
• Hebbian associations + Forgetting & Retrieval

Between Fore and Start

• Timing
  • Layer of time cells
  • 
• Preparation
  • The motor system ‘stages’ a response, but holds it under inhibition..
  • When the Go-stimulus (S2) arrives: activation
  • 

Learning

• Different ‘Time cells’ and ‘motor inhibiton & activation’ are active at the same time: this leads to hebbian learning
• Fire together, wire together
• Forms memory traces : aka chunk
• 

Retrieval

• At the start, high degree of inhibition and low degree of activation
• If prev trial is short, inhibition short and more activation
• $RT=\frac{I}{A}$
• More activation retrieved : faster
• Recency weighted
• Declarative Memory Blending
• Preparation := Ratio of retrieved I vs. A
• 

Vs ACT-R

• Prepare for ‘the right moment’
  • Moment-to-moment balance of I and A
• ‘the right moment’ is estimated based on time (pulses) and memory (DM)
  • Similar; but memory ‘chunks’ contain I- and A-traces not a single moment at which one should be prepared
• If we are prepared→ benefit, else cost
  • Scaled benefits
  • Inhibiton increases RT; activation decreases RT
• No active process during timing
  • Continuously retrieving associated memories?
• Once we are prepared, it doesn’t ‘go away’
  • Consequence of ‘more A, less I retrieved’