|Intro to psychology Chapter 4 -sensation|
involves the sense organ,the neural pathway
the minimun intensity
Signal detect theory
‒Theory of how people detect signals
‒The theory is based on the idea that signals are always embedded in noise, and thus the challenge is to distinguish signal from noise
stimuli is light
Form the image
The cornea is the transparent front surface of eye:Light enters here, and rays are bent inward by it to begin the formation of the image.
The lens complete the process of focusing the light on the retina.To focus on objects at different distances, the lens changes shape.(accomodation)
not flat enough
not spherical enough
The pupil change size in different level of light, thereby helping to ensure that enough light passes through the lens to maintain image quality at different light levels.
largest in dim light
smallest in bright light
Absorption of light by photo pigments in receptors starts transduction process neural impulse travels to brain via neurons.
For seeing at night
cannot distinguish details
For seeing during the day
can distinguish details and work for color vision
Process that leads to increased sensitivity to light after being in the dark.
The pupil changes size
Photochemical changes in the receptors
dark adaptation curve
3 types of receptors
explains color deficiencies
2 types of color-sensitive units
number of neurons activated
Amplify and transmit the sound to the receptors
Transduce the sound into neural impulse