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Pokorny J. Smith V. Shevell S. In other words, people are able to detect light stimuli at lower levels once their eyes have adapted to the dark. Just think of what it is like when you first enter a dark room after leaving a light room. At first they can be very difficult to see anything, but once your eyes have adapted to the dark you were better able to detect visual stimuli and your environment. For example, researchers might test the absolute threshold for the detection of the sound of a metronome.
In general, children tend to be able to detect lower levels of sound in adults because their hearing is more sensitive. As people age, hearing tends to decline. The absolute threshold for scent is the minimum level of a concentration of the person can smell. For example researchers might release small levels of a scent into a room to see if a participant can detect the smell.
Factors that might impact the absolute threshold in this case include the strength of the scent, the size of the room, and any other scents that might be present. The absolute threshold plays an important role in psychological research. One important thing to remember is that the absolute threshold should not be confused with the difference threshold. The difference threshold relates to the smallest detectable difference between two stimuli.
It is also important to recognize that a variety of psychological factors can play a role in influencing the absolute threshold. Motivation, emotion, and other psychological states you have an affect on whether a person can detect a stimulus in their environment. Hecht, S. Simply put, at really low levels of a stimulus, some subjects can detect it while others cannot.
There also might be differences within an individual. Think about maybe a time when your friend asks if you heard a sound, and you think maybe you did, but you're not entirely sure. So rather than asking, "What is the absolute "lowest sound a person is ever capable of hearing?
And let me try to graph this to make it look a little clearer. So on the X-axis we'll put Intensity, and we'll have lower intensity on one side, and higher intensity on the other. And so for things like sound, a lower intensity would be a very quiet sound, or as a higher intensity sound would be a much louder one. And what that's referring to is actually something you may have experienced yourself when you were in elementary school.
One thing that nurses can do in elementary school are these sound tests. And the way that they did them back when I was in school, was that they'd put these large headphones on your head, and then they'd play tones of different intensities into each of your ears. And the only thing that you as a listener had to do was raise your hand, either your left hand or your right hand when you heard a tone in either your left or right ear.
I always heard them. I always raised my hand. And that's what this Y-axis is referring to. And so imagine that this is you, and you have these headphones on, and that you're going through these same tests, and sometimes a sound is presented, and other times it isn't, but all the sounds are of different intensity.
Well if you were to graph the responses, you might wind up with something like this, where the higher the tone is, you're more likely to identify it. But as it gets lower, you're less reliable in your judgement. Before we move on, I do want to mention that the absolute threshold of sensation is different from a concept that has been talked about in other videos.
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