What is the difference between Jnd and absolute threshold?
The just noticeable difference (JND), also known as the difference threshold, is the minimum level of stimulation that a person can detect 50 percent of the time. The absolute threshold for sound, for example, would be the lowest volume level that a person could detect.
What does Weber’s law tell us about perceiving difference between two stimuli?
Weber’s law, also called Weber-Fechner law, historically important psychological law quantifying the perception of change in a given stimulus. The law states that the change in a stimulus that will be just noticeable is a constant ratio of the original stimulus.
What is the minimal stimulus necessary for detection?
absolute threshold
Why we perceive some stimuli more quickly instead of another stimulus?
The Law of Proximity The brain groups together the elements instead of processing a large number of smaller stimuli, allowing us to understand and conceptualize information more quickly.
What is the biggest difference between bottom up processing and top-down processing?
Bottom-up processing refers to processing sensory information as it is coming in. Top-down processing, on the other hand, refers to perception that is driven by cognition. Your brain applies what it knows and what it expects to perceive and fills in the blanks, so to speak.
Which theory best explains afterimages?
The opponent process theory explains the perceptual phenomena of negative afterimages. Have you ever noticed how after staring at an image for an extended period of time, you may see a brief afterimage in complementary colors after looking away?
Which part of the eye hardens as we age?
Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images. As a result, these images appear out of focus.
Is the minimum amount of stimulus energy that must be present for the stimulus to be detected 50% of the time?
The sensitivity of a given sensory system to the relevant stimuli can be expressed as an absolute threshold. Absolute threshold refers to the minimum amount of stimulus energy that must be present for the stimulus to be detected 50% of the time.
Why did Fechner modify the definition of absolute threshold by adding that people can detect the stimulus 50 percent of the time?
Why did Gustav Fechner’s definition of absolute threshold need to be modified? Because his definition of the absolute threshold did not differ significantly from the difference threshold.