5.01 Intro to sensation Flashcards Preview

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Flashcards in 5.01 Intro to sensation Deck (14):
1

occurs when special receptors in the sense organs are activated

sensation

2

anything in the environment that is detected by the senses

stimulus

3

the process by which outside stimuli are turned into neural signals in the brain

transduction

4

special neurons that are stimulated by various kinds of energy

sensory

5

sense receptors transduce physical information into __ information

electrical

6

(1795-1878) did studies to determine the smallest difference between two weights that could be detected

Ernst Weber

7

the smallest difference between two stimuli that can be detected half of the time

just noticeable difference (jnd)

8

Weber's law

whatever the difference between two stimuli might be, it is always constant, meaning it should increase in consistent increments

9

(1801-1887) studied the absolute threshold

Gustav Fechner

10

the lowest level of stimulation that a person can concsiously detect 50% of the time that the stimulus is present

absolute threshold

11

stimuli presented below the level of conscious awareness; just strong enough to activate sense receptors, but not enough for people to be consciously aware of them

subliminal

12

occurs when our sensory receptors respond to a stimulus, but the lower centers of the brain do not send the signals to the cortex

habituation

13

occurs when receptor cells become less responsive to an unchanging stimulus, and they do not send signals to the brain

sensory adaptation

14

constant movement of the eyes; tiny little vibrations that people do not notice consciously; they prevent sensory adaptation to visual stimuli

microsaccades or saccadic movements