HTHSCI 1G03 Lecture Notes - Lecture 10: Secondary Somatosensory Cortex, Central Sulcus, Thalamus

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 1G03
• Professor: Mike Wong

Document Summary

Psychobiology lecture 10: from receptors to brain (touch) Raii (cid:271)rai(cid:374) would(cid:374)"t k(cid:374)ow what to do with i(cid:374)for(cid:373)atio(cid:374), may think it is a flat piece. Ra brain may think that piece initially starts flat, then has grooves. Sa1 distinct peaks and valleys, brain would have some idea of the stimulus that is presented to the skin. Somatosensory cortex divided into 2 sections (located just behind central sulcus: primary somatosensory cotrex, secondary somatosensory cortex. The representations in the somatosensory homunculus vary based on body part (some have larger areas than other: representation of man shows area with larger represenations (ex: hands, lips, ears) Areas with larger representation are more sensitive. Short lines = sensitivity, long lines = less sensitive. Raster plots each dot represents action potential, y-axis is trial. Ra onset and offset, no sustained. Sa onset and sustained, no offset. Si differs, some shows ra, some sa some a combination of them (all)