1 / 12

Sensory Systems

Sensory Systems. Lecture 12. Sensory Information. Detection of changes in environment external or internal 4 main functions perception control of movement regulation of body function maintenance of arousal Not all conscious experience ~. Sensation vs. Perception . Sensation

tyme
Download Presentation

Sensory Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sensory Systems Lecture 12

  2. Sensory Information • Detection of changes in environment • external or internal • 4 main functions • perception • control of movement • regulation of body function • maintenance of arousal • Not all conscious experience ~

  3. Sensation vs. Perception • Sensation • detection of stimulus • 1st interaction with NS • filtering • Perception • integrated of information • selected, organized & interpreted • Different perceptions of same event ~

  4. Sensory Receptors • Specialized cells • similar properties to neurons • Transduction • environmental energy  neural signal • receptor potential ~

  5. Sensory Receptors • Mechanoreceptors • auditory, somatosensory • Chemoreceptors • taste, smell • Photoreceptors • vision • Thermoceptors • hot, cold ~

  6. Sensory Information: 4 types • Modality • visual vs. pain vs. auditory, etc. • Doctrine of specific nerve energies • Intensity • frequency code • Duration • fast & slow adapting receptors • Location • receptive fields ~

  7. Cortical Organization • Topographic • area in receptive field • mapped onto cortex • Examples • cochlea  A1 • retina  V1 • dermatomes  S1 ~

  8. Organization of Pathways • Hierarchical (serial) • receptor  1st order neuron  higher order neuron • levels: different processing function • Parallel (simultaneous) • different submodalities • color vs. monochrome vision • pain vs. touch • converge at higher cortical levels ~

  9. Sensory Modalities • Auditory • timbre • pitch • Vision • color • shape • motion ~

  10. Sensory Modalities • Chemical senses • Gustatory – taste • Olfactory - smell • Orienting senses • vestibular system • head orientation, rotation, balance • mechanoreceptors in middle ear ~

  11. Sensory Modalities: Somatosensation • Primarily mechanoreceptors • Touch • pressure, vibration • Kinesthesis • body position & movement ~

  12. Sensory Modalities: Somatosensation • Pain (stretch receptors) • itch (chemoreceptors) • temperature (thermoreceptors) • Haptic System • touch & kinethesis

More Related