Three Steps in the Sensation and Perception of a Stimulus

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Presentation transcript:

Three Steps in the Sensation and Perception of a Stimulus All Sensory Systems Follow the Same Plan Reception Transduction Coding

A Sensory System… Requires different receptors to discriminate among different forms of energy. Should discriminate among different intensities of stimulation. Should respond reliably. Should respond rapidly. Should suppress extraneous information.

A Variety of Sensory Receptors

Touch - Skin Receptors convert energy into a change in electrical potential Free Nerve Ending Pain Heat/Cold Merkel’s Discs Touch Ruffini’s Endings Stretch

Transduction 1. Stimulation causes deformation of the Pacinian corpuscle 2. Deformation opens pours in membrane allowing Na+ in 3. Na+ depolarizes the cell in the form of a generator potential

Generator Potential Similar to an EPSP. Amplitude is directly proportional to the stimulus strength.

Coding A set of rules for translating information from one source to another. Sensory information: is coded into action potentials via stimulus… Intensity Type Location Identity undergoes adaptation and suppression is summed across cognitive levels

Stimulus Intensity Coding Nerve cells can fire at different thresholds for stimulus intensity Each alone can only fire 150 action potentials per second Combined they can fire as many as 450 action potentials per second

Stimulus Type Coding Labeled Lines Each receptor has a distinct pathway to the brain Different types of stimuli can be organized in specific areas of the brain

Stimulus Location Coding Somatosensory Cortex Homunculus