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Sensory and Perceptual Systems, Sense, Source of Information, Gravity and Acceleration, Joint Position, Muscle Stress, Chemical Structure, Smell and Taste, Overarching Principle, Types of Receptor Cells are some points from this lecture of perception.
Typology: Slides
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Major Sensory and Perceptual Systems
Sense Source of information
Seeing Light
Hearing Sound
Balance Gravity and acceleration
Touch Pressure
Temperature Temperature
Pose Joint position and muscle stress
Smell & Taste Chemical structure Docsity.com
Overarching Principle
Sensory and perceptual systems (including their associated mechanisms for learning and plasticity) evolve in the service of obtaining information about the environment that is relevant for the tasks the organism must perform in order to survive and reproduce.
Corollary : The design of the sensory and perceptual systems is determined by the tasks it performs, by the physical/statistical properties of the environment, and by various biological factors/constraints.
There Are 4 Basic Types of Receptor Cells
Mechanoreceptive Somatosensory (touch) Proprioceptive (muscle and joint receptors) Vestibular Auditory (Lateral line) Chemical Olfaction Taste Thermal Temperature Electromagnetic Vision (Electroreception) (Infrared detection)
Pain receptors may fall into any of the first three categories
Stimulus energy
mV Time
mV
Time
Receptor potential
Action potentials
TRANSDUCTION
Stimulus triggers a receptor potential in the receptor; receptor potential triggers action potentials in the transmission neuron (or its own axon if it has one); the CNS only sees the action potentials Docsity.com
Difficult Problems for Perceptual Systems
Context problem Objects often appear in a complex and varying context of other objects, making recognition of objects difficult.
Category complexity problem The specific things that define a category are often quite different, making categorization difficult.
Missing dimensions problem Vision: The images in the eyes have two-dimensions in space and one dimension in time. The third dimension in space (depth) is lost and must be reconstructed.
Audition, Olfaction: The signals reaching the ears and nose have one dimension in time. Any other dimensions must be reconstructed.
Approaches to Understanding Sensory Systems
Natural tasks
Natural scene statistics
Anatomy
Responses of and within individual neurons
Responses of neural populations
Perceptual/behavioral performance
Mathematical and computational modeling
Approaches to Understanding Sensory Systems
Natural tasks
Natural scene statistics
Anatomy
Responses of and within individual neurons
Responses of neural populations
Perceptual/behavioral performance
Mathematical and computational modeling
Natural reflectance spectra
Regan et al. (2001)Docsity.com
Approaches to Understanding Sensory Systems
Natural tasks
Natural scene statistics
Anatomy
Responses of and within individual neurons
Responses of neural populations
Perceptual/behavioral performance
Mathematical and computational modeling
Microscopy, Imaging, Assays
Single and multi-unit recording
Optical, Calcium, Functional-MR imaging
Event related potentials (ERPs)
Lesion, Knockouts, etc.
