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Sensorimotor Prediction and Memory in Object Manipulation J.Randall Flanagan et al

Sensorimotor Prediction and Memory in Object Manipulation J.Randall Flanagan et al. …sensorimotor memory from previous lifts comes to dominate visual size information in terms of force prediction. lwelti@media.mit.edu. General Sensory Receptors. Classification based on: a. exteroceptors

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Sensorimotor Prediction and Memory in Object Manipulation J.Randall Flanagan et al

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  1. Sensorimotor Prediction and Memory in Object ManipulationJ.Randall Flanagan et al …sensorimotor memory from previous lifts comes to dominate visual size information in terms of force prediction. lwelti@media.mit.edu

  2. General Sensory Receptors Classification based on: a. exteroceptors 1. Location b. interoceptors c. propioceptors a. mecanoreceptors 2. Type of stimulus detected b. thermoreceptors c. photoreceptors d. nociceptors e. Itch receptors 3. Structural complexity a. simple b. complex

  3. Motor and Sensory Predictions Related to Weight The greater the E[weight], the more rapid the increase in load force

  4. Factors that Influence Sensorimotor Prediction • Visual and haptic information about the object size • Immediate sensorimotor memory from previous lifts When lifting everyday objects, people only perform erroneously ONCE! sensorimotor memory update

  5. The size-weight illusion The smaller object is judged to be heavier because it is heavier than expected. actual sensory information differs from the expected sensory information from the size of the object … but, sensory information can be processed separately, depending on whether it is used for action or for perception

  6. Sensorimotor Memory Is memory fleeting? Longer lasting? Experiment: two cubes, equally weighted, different volume • lift cubes (by a removable handle) in alternation 20 times each • delay: 15 min or 24 hrs • handle instrumented with two sensors to measure forces and torques

  7. Adaptation of Fingertip Forces to size-weight stimuli single participant

  8. Adaptation of Fingertip Forces to size-weight stimuli averaged data

  9. Adaptation of Fingertip Forces to size-weight stimuli averaged data

  10. Discussion • Sensorimotor memory is fully maintained for a period of 15 minutes and somehow retained for 24 hours. • In the 15-minute experiment in the second lift series, participants correctly scaled their fingertip forces right from the beginning. Visual cues to select the internal models of memory. • In the 24-minute experiment grip force was initially scaled erroneously, but it adapted more rapidly than in the first lift series.

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