جواد حاتمی

Aims: The present study aimed to validate the Persian Emoji Lexicon (PEL) and examine gender and cultural differences in the perception of the affective properties of selected emojis. Method: The study consisted of two phases: emoji selection and an online survey. First, we identified the 109 most frequently used emojis on Twitter. In the second phase, we assessed emotion and valence ratings from a sample of 200 X users (140 females; 27.3 ± 3.5 years). Results: Of the 109 selected emojis, 90 were perceived as having a positive valence. Gender comparisons revealed that women rated significantly higher emotional intensity across all eight emotion dimensions compared to men. We also compared our findings with a similar database validated among Canadians. The inter-rater reliability for emoji valence ratings between Iranian and Canadian participants showed a fair level of agreement (Kappa coefficient = 0.357), while also highlighting significant cultural differences in emotion perception. Conclusion: This database serves as a valuable resource for sentiment analysis of social media texts containing emojis, as well as for practical applications where emojis function as emotional cues to influence behavior (e.g., in marketing and education).

Most studies on placebo mechanisms rely on Expectancy Theory, which suggests that conceptual expectations can bring about physiological change. However, the exact processes underlying this effect remain unclear. Perceptual Symbol Systems (PSS) Theory, grounded in Embodied Cognition Theory, offers a more specific explanation: mental representations grounded in sensory-motor systems may directly evoke bodily responses. This study tested whether embodied primes, based on PSS Theory, elicit stronger placebo responses than traditional expectancy-based suggestions. Using a within-subjects design, 71 university students underwent a cold pressure task under three conditions: (1) verbal suggestion of an analgesic cream, (2) visual priming with a photo of a person looking upward, and (3) combined visual-motor priming, where participants also looked upward themselves. The placebo response was measured by changes in pain intensity and heart rate. Results showed that both embodied conditions (visual and visual-motor priming) produced stronger placebo responses than the verbal suggestion condition, as indicated by lower pain intensity and reduced heart rate (F(2,140)=5.83; p<.01). However, the difference between the two embodied conditions was not statistically significant in terms of pain ratings. Notably, visual-motor priming led to a greater reduction in heart rate than visual priming alone (F(6,330)=1.99; p=.06), suggesting a subtle additive effect of motor engagement. These findings support the role of unconscious embodied processes—specifically, perceptual and motor representations—in modulating placebo responses. They offer a promising direction for understanding how non-verbal bodily cues may influence the complex perception of pain.

Previous research has identified correlations between individual differences, such as age, and perceptual processes. However, the specific roles of these factors in face and house detection and the categorization of ambiguous stimuli remain inadequately understood. To address this issue, we employed a face/house categorization task to investigate how participants of different ages perceive human agents versus non-natural objects amidst varying levels of visual noise (40%, 50%, 60%, and 70%). Our results revealed that older participants exhibit longer reaction times (RT) in face detection under low-noise, ambiguous conditions (40% noise)—pointing toward a selective effect of age on face processing rather than on other object categories, such as houses.

During the Coronavirus pandemic, online classes and exams became popular to protect people's health. Despite the benefits, there were security issues and exam cheating. This research was conducted with the aim of comparing the amount and type of cheating in online and face-to-face exams using a qualitative method. The statistical population was all male and female students of the sixth grade of Pirbakran city in the academic year 2021-2022. In this research, a mixed rural school was selected using available sampling method and a structured face-to-face interview was conducted with all 14 sixth-grade students of the school. The interview questions were written and checked in MAXQDA software version 2020. From the analysis of the interviews, it was concluded that the rate of student cheating in online tests is much higher than that in face-to-face tests. The most common methods of cheating in online tests are the use of textbooks, the help of classmates, and the use of the Internet. Also, the most common method of cheating in face-to-face exams was the help of a classmate, and they considered the objective questions in the exams to be one of the important reasons for the ease of cheating. According to the findings of the research, the exams should be held in person as much as possible. In order to reduce cheating in the design of face-to-face and online tests, it is better to use more conceptual, in-depth and descriptive questions not published on the Internet browser; design different questions for students and explain the importance of studying and the negative points of cheating for students; replace four-choice questions with explanatory questions; increase the distance between the students in the face-to-face exam and control to prevent the presence of embedded fraud; not to answer the questions by the invigilators, and check students' pockets and hands in order to prevent cheating and avoid providing them with multiple draft sheets.