03 Fundamentals of Sensory Processing

03 Fundamentals of Sensory Processing - LEARNING...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
N-28 LEARNING OBJECTIVES: FUNDAMENTALS OF SENSORY PROCESSING 1. Describe how receptors signal changes in the environment. 2. Describe the conceptual differences between the specific sensory pathways (e.g., three neuron pathway) and nonspecific sensory pathways. 3. Define “sensory unit.” Draw a sketch of a typical sensory unit on the index finger, and contrast that with a typical sensory unit on the back. 4. On a diagram of the cerebral cortex, identify the locations of the somatosensory, visual, and auditory primary sensory regions. 5. Describe the neuronal mechanisms responsible for determining the stimulus type, stimulus intensity, stimulus location, and stimulus duration. 6. From a graph of the firing pattern of an afferent fiber, define whether the receptor is slowly adapting, a velocity detector, or an acceleration detector.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
N-29 Robert W. Blair, Ph.D. FUNDAMENTALS OF SENSORY PROCESSING Reading: Widmaier et al., Human Physiology, 12 th ed., pp. 186-197 I. General Concepts of Sensation Different people can respond in various ways to a given stimulus; furthermore, a given person can respond to the same stimulus in different ways depending on the situation. This occurs despite the fact that everyone has the same nervous system “equipment” to respond to a stimulus. How can this be? First, consider a minor burn. Everyone has receptors that will be excited by this stimulus. The stimulus itself, and the response of the receptors to the stimulus, are constant in different people. The information regarding the burn is transmitted to the cerebral cortex (by pathways and mechanisms we’ll discuss). If the cortex believes that the information is relevant, then the information reaches consciousness and becomes a sensation . The individual will interpret the significance of the sensation, and this becomes the perception . Some people will consider the minor burn no more than an inconvenience, while others will think that they should cease all activities and treat the burn. Note that the sensory information is identical, but the ultimate perception can vary. Now consider a new sound to your right. The auditory system will relay this information to the cortex. If you are by yourself, then you would probably look around to the right, toward the source of the sound. Thus, the stimulus reached the level of sensation, and your perception was that you should look around for the source of the sound. But suppose that you are in a crowded room, talking to a friend, and the new sound occurred. In this case, the same sound might not reach the level of sensation (unless it’s a cell phone call!); even if it did reach sensation, your perception might be that the sound is not meaningful compared to talking with your friend. You constantly are bombarded by a variety of stimuli, but the nervous system tends to filter out
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/01/2011 for the course PSYO 5016 taught by Professor Staff during the Fall '11 term at The University of Oklahoma.

Page1 / 10

03 Fundamentals of Sensory Processing - LEARNING...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online