Lec 11 - Speed, Accuracy & Coordination Pt.2 Flashcards
What is the Speed-Accuracy Trade-Off?
The inverse relationship between speed and accuracy in movement. As speed increases, accuracy tends to decrease, and vice versa.
What are the three main types of Reaction Time tasks?
1) Simple RT,
2) Go/No-Go RT, and
3) Choice RT.
They increase in complexity and typically result in longer reaction times in that order.
What are bimanual skills?
Tasks that require both hands to work together, such as playing piano or typing.
What does the Bimanual Fitts Task demonstrate?
It shows that when both hands perform tasks with different difficulty levels, the easier task is influenced by the harder one, suggesting interdependence between limbs.
What does the Gamma-V Experiment reveal about bimanual coordination?
It demonstrates that attempting to perform two unique tasks simultaneously (one hand drawing a “V”, the other a “Gamma”) leads to interference, indicating a limit to independent motor programs for each hand.
What does the Continuous Timing Experiment show about movement stability?
It shows that in-phase movements are most stable, followed by anti-phase, while out-of-phase movements are least stable. Shared timing helps in coordination.
How can switching between movement patterns help with stability?
In tasks like walking, if speed demands make one movement pattern less stable, switching to a more stable pattern (e.g., from walking to running) can help maintain accuracy and stability.
How do degrees of freedom relate to movement patterns?
The ability to switch between movement patterns allows flexibility, providing more stable options for coordination in various conditions.
What does the Affordance Competition Hypothesis (Cisek & Kalaska) suggest about motor planning?
It suggests that the brain can prepare multiple motor plans simultaneously and selects the best one based on available information.
What evidence supports the idea of parallel motor planning?
Recordings from the Dorsal Premotor Cortex show that even when only one movement is ultimately executed, the brain may initially encode multiple potential movements.
