Chapter Four Flashcards Preview

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Flashcards in Chapter Four Deck (13):
1

Sensation

simple stimulation of a sense organ

2

Perception

organization, identification, and interpretation of a sensation in order to form a mental representation

3

Transduction

occurs when sensors in the body convert physical signals from the environment into encoded neural signals sent to the central nervoous system

4

absolute thresholds

the minimal intensity needed to just barely detect a stimulus in 50% of trials

5

Psychophysics

methods that measure the strength of a stimulus and the observer's sensitivity to that stimulus

6

Just Noticeable Difference

the minimal change in a stimulus that can just barely be detected, also know as the difference threshold

7

Weber's Law

the just noticeable difference of a stimulus is a constant proportion despite variations in intensity

8

Sensory Adaptation

Sensitivity to prolonged stimulation tends to decline over time as an organism adapts to current conditions

9

Signal Detection Theory

the response to a stimulus depends both on a person's sensitivity to the stimulus in the presence of noise and on a person's decision criterion

10

Visual Acuity

the ability to see fine detail

11

Brightness

Amplitude of the wave

12

Colour Perception

Length of the wavelength

13

Purity

Complexity of the wavelength