Sensation

Sensation - Sensation & Perception - Part 1 Sensation...

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Sensation & Perception - Part 1 Do we see what is there, or what we believe is there? Is the resulting perception based on… Properties of the object ? Properties of our mind ? Answer: ALL OF THE ABOVE Top Down Processing • CLOSE YOUR EYES • Right Section • Left Section • Stimulus – causes people to interpret things in different ways • Results • 1. Rat ____(right)___________ • 2. Man ___(left)___________ Bottom - up processing – begins with object • Starts at entry level • Based on properties of stimulus • Sensations coming up to the brain Sensation - Properties of the stimulus (how loud is the sound, how bright is the light)
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- Transduction by receptors Sensation Detection of physical energy from the environment by sensory receptors. (light waves/sound waves) Changing, encoding or tranducing that energy into neural signals. Top-down processing – begins with brain • Cognitive influences on perception Rules the brain uses to interpret sensory input • The Gestalt - the percept - a unified whole • Based on ‘higher level’ information - prior knowledge or experience - ’rules’ Perception • job = Selecting, organizing and interpreting sensory information . • Enables recognition & makes meaning of objects and events. • Making meaning (3 jobs of perception:) - Distinguish one object from another - Locate objects - Interpret Psychophysics • The study of the relationship between the physical characteristics of a stimuli (intensity, wavelength etc)
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and our interpretation of them (Perception) Transduction • Transduction - Conversion of one form of energy to another. Pressure waves of sound - Pressure waves of sound - Temperature differences: heat, cold - Chemical molecules for taste, smell - Wavelengths of light Stimulus Detection What stimuli can we dectet? • Receptors • Thresholds • Changes / Sensory Adaptation Receptors -. ..‘Feelers’ in a sea of energy. ..Transducers • An example: The Visible Spectrum • The Electromagnetic Spectrum • Pit Viper/Python – heat sensers, don’t see what they are striking at, strikes at heat. • Birds – sense magnetic fields (like a compass)
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This note was uploaded on 04/30/2008 for the course PSY 1305 taught by Professor Rowatt during the Spring '07 term at Baylor.

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Sensation - Sensation & Perception - Part 1 Sensation...

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