Lec 7 - Sensory Contribution To Skilled Performsnce Pt.2 Flashcards
What are reflexes?
Reflexes are stereotyped, involuntary, automatic, and rapid responses to stimuli, typically occurring in less than 150ms.
What is the M1 response?
The M1 response, or monosynaptic stretch reflex, is the fastest reflex (30-50ms). It involves a single synapse in the spinal cord and helps maintain posture.
What is the M2 response?
The M2 response, or polysynaptic functional stretch reflex, takes 50-80ms and involves at least one synapse in the brain. It is more flexible and influenced by instructions.
What is the M3 response?
The M3 response is the voluntary reaction time response (~150ms), involving complex brain processing, resulting in flexible and sustained movements.
What are triggered reactions?
These are complex, coordinated, non-voluntary reactions to stimuli that affect multiple muscles and are faster than voluntary responses.
What is the final common path in motor control?
The final common path integrates reflexes (M1, M2, M3) and voluntary control into a single motor output, producing coordinated movement.
What is the dorsal visual stream?
Known as the “how” stream, it unconsciously processes spatial location and movement, guiding actions like reaching and grasping.
What is the ventral visual stream?
Known as the “what” stream, it consciously processes object recognition and identification, focusing on the central visual field.
How does damage to the ventral stream affect perception?
It impairs object recognition but preserves the ability to interact with objects, demonstrating the functionality of the dorsal stream.
What is optic flow?
Optic flow is the pattern of light movement across the retina, providing information about motion, position, and timing.
What is Tau in visuomotor control?
Tau is a measure of time-to-contact, calculated by dividing the retinal image size by its rate of change, helping time movements like catching.
How does the ventral stream influence movement planning?
It integrates knowledge about objects (e.g., shape, use) with action goals to guide interactions, such as grasping or manipulating.
What is the rotating tunnel illusion?
It creates a perception of self-motion, demonstrating how visual input can override vestibular and proprioceptive cues, affecting balance.
