EXSS2025 Lecture Notes - Lecture 2: Motor Learning, Proprioception, Sensory System
4 Sep 2018
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Exteroception - eg. generated outside the body (vision, hearing) Degeneration of large afferent fibres that carry proprioceptive and tactile inputs. All movements have to be pre-planned and prepared. Sensory system (proprioception) is vital for movement. Merkel cells - constant pressure on skin. Ruffini endings - deeper pressure, fast changes in pressure, consistency. Distribution differs depending on area (two point discrimination-highest in fingertips, face, feet) Relationship between sensory stimuli and psychological sensation. Can utilise substances or artificial stimulation to increase/decrease sensitivity. Probability of detecting a particular stimulus can cause sensitivity changes (eg. hyper response) Eg. changes in degree, change in skin indentation over time. Can be used in daily tasks - eg. identifying textures. Differences in firing patterns help you to identify textures. Responsive to stretch (shortening or lengthening), rate or stretch, muscle length. Properties of muscle spindles - location, intensity, timing. More spindles around joint areas/larger muscles and neck/head - eg. direction.
