9/19/2023 0 Comments Norrkross morphx![]() Such perceptually equivalent stimuli could then be used in another experimental paradigm to measure the effect of affect on performance. Measures of sensitivity to different expressions could be used to identify stimuli from different affective categories (e.g., happy and fear) that individual participants find equally challenging to discriminate (perceptually equivalent). Dissociating the effect of perceptual processing from affective processing in facial expression recognition might be achieved by using stimuli that are tailored to individual participants. ![]() Therefore, understanding how sensitive an individual is to different facial expressions could have diagnostic value and/or support the monitoring of treatment regimen.įacial emotion recognition relies on both perceptual processing and processing of affect from nonsensory systems, the relative contribution of which remains unclear (see Calvo & Nummenmaa, 2016, for a review). Additionally, there is considerable evidence showing that ability to recognize emotions from facial expressions is altered or impaired in, among others, people with depression (Dalili, Penton-Voak, Harmer, & Munafò, 2015), autism spectrum disorders (Trevisan & Birmingham, 2016), and neurodegenerative disorders (Löffler, Radke, Morawetz, & Derntl, 2016). Therefore, reliable detection and identification of the emotion conveyed by facial expressions is essential for effective positive social communication. Where perceptual processing is mainly driven by sensory systems and relies on the visual information in the face, affective processing retrieves emotional meaning through higher-order cognitive processes.įacial expressions are widely thought of as external representations of an individual’s internal thoughts, motivations, and feelings. This method can be applied to both (i) clinical areas where case studies are important and access to large sample sizes can be challenging and (ii) understanding the relative contribution of perceptual processing and affective processing in facial expression recognition. This paper describes a method to measure the sensitivity of an individual to different facial expressions and test differences in the individual’s sensitivity to these facial expressions using the model-comparison approach. Application of the approach for use with clinical populations, as well as understanding the relative contribution of perceptual processing and affective processing in facial expression recognition, is discussed. ![]() ![]() Increased sensitivity to happy compared with fear expressions was affected at smaller image sizes for some participants. Sensitivity is equivalent when measured on two different testing sessions, and greater sensitivity to happy expressions is maintained with short stimulus durations and stimuli generated using different morphing software. This tells us that individual participants are more sensitive to happy compared with fearful expressions. Individuals could reliably discriminate happy expressions diluted with a greater proportion of the neutral expression compared with that required for discrimination of fearful expressions. Sensitivity is defined as measurement of the proportion of neutral expression in a stimulus required for participants to discriminate the emotional expression on 75% of presentations. The expression was diluted to different degrees by combining it in different proportions with the neutral expression using morphing software. Sensitivity is measured by asking participants to discriminate between an emotional facial expression and a neutral expression of the same face. It shows that individual participants are more sensitive to happy than to fearful expressions and that the differences are statistically significant using the model-comparison approach. ![]() I think if that works we can be reasonable sure that it works as intended.This paper describes a method to measure the sensitivity of an individual to different facial expressions. (The calculation takes about 5 seconds on my 1.5GHz Powerbook G4.)ħ) Save the movie by clicking "Save" in the movie window toolbar.Ĩ) Open the finished movie in QuickTime and see that it plays. See that it renders a movie where the 1 changes into a 2. Also, there should be little green lines drawn along the edges of the two shapes.Ħ) Click "Render movie" to get a QT movie of the morphing. Test basically that it launches, draws and can export a QT movie.ĥ) See that the 1- and 2-images are drawn and a preview of 5 images at the bottom where the 1 transforms into a 2. ![]()
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