8/24/2023 0 Comments Normal pupil size in room lightResearch has also suggested that pupillometry tests may be a more reliable measure of stress-related responses than GSR, although there are more constraints on how this research is carried out which are discussed below. It has since been established that any emotionally charged stimuli (presented as images, words, sounds, etc) will elicit an expansion of pupil size, providing a measure of emotional response not too dissimilar from galvanic skin response ( GSR in which the intensity of an emotion can be uncovered, but not the direction). While it was originally thought (and often claimed in pop-science) that the pupil would only dilate in response to positive or attractive stimuli, psychologists have uncovered that both positively and negatively valenced information can bring about such an increase. Pupillometry is defined as a measure of pupil dilation, giving unique insights into how an individual views their environment. Pupil dilation is affected not only by how we see the world, but also by how we experience it. ![]() The amount of light can be controlled by the size of our pupil, but that’s not the only thing that the pupil size responds to. ![]() When we look around at the world, our eyes track different features, and both our corneas and the tissue surrounding the lenses of our eyes adjust to focus the light, making a scene visible. If our eyes are the windows to the soul, then the pupils are at least the gateway to the brain.
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