Question | Answer |
What are Sensory Pathways? | Ascending Spinal Tracts, consolidating information from UNMIXED Sensory units --> Specific Areas of Cerebral Cortex |
What are 2 examples of Sensory Pathways? | ANTERIOR Spinothalamic Pathways, LATERAL Spinothalamic Pathways |
What are 3 characteristics of ANTERIOR Spinothalamic Pathways? | 1. carry TOUCH and PRESSURE sensation; 2. A-fibers, well-myelinated Neurons; 3. AP Velocity: 70-120 m/s |
What are 3 characteristics of LATERAL Spinothalamic Pathways? | 1. carry TEMPERATURE and some PAIN sensations; 2. C-fibers, poorly-myelinated Neurons; 3. AP Velocity: 1-20 m/s |
What would happen if an injured Heat Receptor grew back as a Pressure Receptor? | Pressure interpreted as Heat |
What determines a Stimulus' INTESITY? | the NUMBER of active Sensory Units and the FREQUENCY of incoming Sensory AP's |
Is Stimulus Intensity infinite? | there is limit to how much is perceivable |
What does the Thalamus determine? | CRUDE localization |
How does the Thalamus determine localization? | by which Sensory Pathways are active |
What does the Primary Sensory Cortex determine? | PRECISE localization |
How does the Primary Sensory Cortex determine localization? | Sensory Areas are MAPPED out - POSTERIOR to the Central Sulcus on the Cerebral Cortex |
How is the exact location of a stimulus determined? | by COMPARING the relative Activity and Inactivity of adjacent Sensory Units |
Which areas of the Somatosensory Cortex are the largest? | areas devoted to the parts used to interact with the environment |
What are the 2 functions of the Parietal Association Cortex? | 1. provides information regarding Previous Experience; 2. evaluates Shape/Texture and determines Implication |
What is the function of the Frontal Association Cortex and Limbic System? | adds Emotional and Motivational elements |
What is Stimulus Peripheral Projection? | mental. Assignment of stimulus to its proper External Location |
What influences Stimulus Peripheral Projection? | bilateral COMPARISON of the stimulus ARRIVAL times in the Brain and their relative INTESITIES |