Class Notes (810,034)
Canada (493,928)
Psychology (7,623)
PSYB65H3 (519)

Sensory Systems

7 Pages
Unlock Document

University of Toronto Scarborough
Zachariah Campbell

Lecture 8  Continuation of Lecture 7 Hearing - Tonotopic Theory o Different points on basilar membrane & in the cortex represent different sound frequencies Auditory Pathways - Axons of hair cells ofrm the auditory nerve - Auditory nerve projects nuclei - Next, axons project to the inferior colliculus & then relay through the medial geniculate nucleus of the thalamus - One, pathway projects to the primary auditory cortex, while the other projects to the secondary auditory cortex Body Senses - 4 major somatosensory submodalities: 1. Nocioception a. Perception of pain b. Perception of temperature c. Anything that impacts a person‟s survivability 2. Hapsis a. Fine touch 3. Proprioception a. Perception of position of body in space 4. Balance Somatosensory Cortex (SI) - Wilder Penfield o Stimulated somatosensory cortex in epileptic patients & topographically mapped SI - Homunculus “Little Human” o Disproportionate sizes Lecture 8 o Larger area = higher sensitivity o Larger area = more neural representation we have in the cortex itself  Lips & tongue  Eating  Feeding  Production of speech  Hands  Great tactile feedback - Number of homunculi exist in the somatosensory cortex Vestibular System: Motion & Balance - Located in inner ear - Allows us to perceive our motion & maintain balance - Consists of: o Semicircular canals o Otolith organs - Semicircular canals & otolith organs contain hair cells that bend when we moth - Vestibular system pathway o Hair cells project to the 8 cranial nerve to nuclei in the brainstem o Connections to the midbrain & cerebellum Taste & Smell - Taste receptors o Taste buds  Sweet  Sour  Salty  Bitter - Smell Receptors Lecture 8 o Receptor surface, the olfactory epithelium is composed of  Receptor hair cells  Support cells Olfactory Pathways - Amygdala connected to the olfactory pathway o Amygdala also connected to hippocampus - Therefore, smells can lay down a memory for a very long time Perception - Subjective experience of the transduction of sensory stimuli - Individual differences in perception exist - Perception influenced by context Motor System - Functions to move the body - Parts of motor system o Motor Cortex o Basal Ganglia  Groups of nuclei that are all subcortical – all interconnected o Cerebellum  Basic movements  Learned movements; walking, running o Brainstem  Basic movements  Evolutionary importance o Spinal Cord  Pathway for info to get out to effector organs o Motor Neurons  Neurons connected with muscle fibers for manifestation of behavior Lecture 8 Neocortex & Initiation of Movement
More Less

Related notes for PSYB65H3

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.