Browsing by Subject "high sensitivity"

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  • Hintsala, Sonja (Helsingin yliopisto, 2020)
    Objectives. About a third of the population is highly sensitive in temperament. One of the most important research topics in educational psychology is learning, one aspect of which is learning strategies. Learning strategies and high sensitivity have been studied separately in the past, but there is very little research linking the two. The purpose of this study was to provide information on the relationship between high sensitivity to the use of learning strategies. The research task is to describe what kind of learning strategies are used by highly sensitive and non-highly sensitive students and to investigate how high sensitivity explains the use of learning strategies. Methods. The material was collected using an electronic questionnaire. The questionnaire consisted of a sensitivity test, a section measuring learning strategies, an open-ended question, and background information. The data were analyzed by linear regression analysis using the deletion method. The entire data set (n = 202) consisted of adult people who, according to the research questions, were limited to either highly sensitive students (n = 117), non-highly sensitive students (n = 12) or students (n = 129). Results and conclusions. Elaboration and organization (M = 3.85) were the highest of the means (M), when describing the use of learning strategies by highly sensitive students (n = 117). These two learning strategies, as well as the in-depth treatment of high sensitivity, aim to build connections between things and connect new knowledge with the previous one. This similarity may explain the popularity of using these two strategies with highly sensitive persons. According to the regression analysis, the high sensitivity test positively explained 2% the use of organization statistically significantly (p < .05) and 7.4% the use of critical thinking statistically significantly (p < .001). The strategy of the organization is in line with the in-depth treatment of high sensitivity, as both seek to make connections between things. The strategy of critical thinking is consistent with an inhibition, which is a typical behavior for a highly sensitive person. The main principle in both of these strategies is to use previous information in new situations. These similarities may serve as an explanation for the fact that the high sensitivity test explains the use of organizational and critical thinking learning strategies in a statistically significant way.
  • Karhu, Juho; Hieta, Tuomas; Manoocheri, Farshid; Vainio, Markku; Ikonen, Erkki (2021)
    A high-sensitivity light-emitting diode (LED)-based photoacoustic NO2 sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically limited by background noise and drifts due to a strong signal generated by light absorbed at the photoacoustic cell walls. Here, we reach a sub-ppb detection limit and excellent stability using cantilever-enhanced photoacoustic detection and perform a two-channel relative measurement. A white-light LED is used as a light source, and the spectrum is divided into two wavelength channels with a dichroic filter. The photoacoustic signals generated by the two wavelength channels are measured simultaneously and used to solve the NO2 concentration. The background signal is highly correlated between the two channels, and its variations are suppressed in the relative measurement. A noise level below 1 ppb is reached with an averaging time of 70 s. This is, to the best of our knowledge, the first time a sub-ppb detection limit is demonstrated with an LED-based photoacoustic NO2 sensor. As LEDs are available at a wide selection of emission wavelengths, the results show great potential for development of cost-effective and sensitive detectors for a variety of other trace gasses as well.