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Related Concept Videos

Position and Displacement01:31

Position and Displacement

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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The brain uses extrasomatic information to estimate limb displacement.

Alexander V Terekhov, Vincent Hayward

    Proceedings. Biological Sciences
    |August 28, 2015
    PubMed
    Summary

    The brain uses microscopic vibrations from touching objects to sense limb movement and determine if an object is movable. This research reveals how tactile feedback influences our perception of the physical world.

    Area of Science:

    • Neuroscience
    • Biomechanics
    • Sensory Perception

    Background:

    • The brain must distinguish between movable objects and those fixed to a reference frame.
    • Detecting object mobility typically involves assessing limb displacement during interaction.
    • Standard mechanoreceptor responses are insufficient for precise small-scale displacement detection.

    Purpose of the Study:

    • To investigate the brain's mechanism for estimating object mobility.
    • To determine if microscopic mechanical events contribute to proprioception.

    Main Methods:

    • Subjects interacted with stiff surfaces while pressing with a finger.
    • Analysis of sensory responses to microscopic fluctuations during contact.
    • Correlation of perceived limb displacement with object properties.

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    Main Results:

    • Microscopic fluctuations, similar to granular solid mechanics, induced a sensation of limb displacement.
    • These events are crucial for the brain's estimation of limb displacement during object interaction.
    • Tactile micro-events provide essential information for mobility assessment.

    Conclusions:

    • The brain utilizes microscopic mechanical events, not just gross limb movement, to gauge object mobility.
    • Prior sensory expectations of object interaction shape proprioceptive feedback.
    • This mechanism enhances our ability to interact with and understand the physical properties of objects.