1006 Chapter Notes - Chapter 4: Retina, Optic Chiasm, Receptive Field
Document Summary
Sensation: sense: biological system that transforms information from outside the nervous system into neural activity, sensations are messages from the sense, points to remember: What we experience can change our sensations. Sensory information does not necessarily reflect objective reality (i. e: reality is subjective) Sensory systems: the basic process of sensation. Incoming energy is modified by an accessory structure. Transduction occurs at sensory receptors (cells designed to detect certain forms of energy; similar to neurons in that they fire action potentials & release neurotransmitters) Sensory receptors can adapt to stimulation & become less responsive over time. Sensory nerves carry information from receptors to the cns. Sensory information (except olfactory) first undergoes preliminary analysis by the thalamus before continuing to the cerebral cortex. Coding: translating the physical properties of a stimulus into a pattern of neural. Stimulation of a particular sensory nerve provides codes for that one sense no matter how the stimulation takes place: temporal code.
