Browsing by Subject "Skin conductance"

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    Autonomic reactivity in blood-injection-injury and snake phobia
    (Elsevier, 2018-12) Maldonado, Enrique F.; Pineda, Sara; Torrente, Ginesa; Carrillo Verdejo, María Eduvigis; Sánchez Navarro, Juan Pedro; Martínez Selva, José María; Anatomía Humana y Psicobiología
    Objective: This research aimed to study the salivary flow and other autonomic reactions -heart rate (HR) and skin conductance response (SCR)- in blood-injection-injury (BII) phobia and snake phobia participants, under the assumption that exposure to blood-related pictures in BII phobia will provoke an increase in parasympathetic activity that, in turn, will lead to a greater saliva production than other affective contents. Methods: We selected 18 BII phobia and 14 snake phobia participants along with 22 non-phobia individuals. All participants were exposed to 3 blocks of pictures (12 pictures per block) depicting either mutilations, snakes or neutral, household objects. Saliva samples were taken in the 2-min interval before and after each block. Results: In comparison to other contents, blood-related pictures provoked an increase in salivary flow in BII phobia participants, as well as an increase in the number of SCRs. In the snake phobia group, snake pictures provoked HR acceleration, but the SCRs they elicited did not differ from the SCRs provoked by the blood-related pictures. Conclusion: BII phobia individuals react to their phobic object with a series of physiological changes resulting from a sympathetic-parasympathetic co-activation. This is in contrast with other specific phobias (e.g., small animal phobias) that usually show a sympathetically mediated, defensive reactivity when exposed to their disorder-relevant stimuli. These data support the use of therapeutic interventions in BII phobia that may differ in some respect from those used in other specific phobias.
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    The early days of electrodermal activity
    (Universidad de Murcia. Servicio de Publicaciones, 2021) Sequeira, Henrique; Deren, Pascal; Maitte, Bernard
    Este artículo enfatiza las etapas principales del descubrimiento de uno de los marcadores autónomos más destacados de las expresiones mentales, la actividad electrodérmica (EDA). La contribución de las escuelas de fisiología francesa y alemana, orientada por las necesidades clínicas y el deseo de conocer más sobre los mecanismos fisiológicos, constituyen las primeras raíces de dicha actividad. En este marco, Féré y Tarchanoff, descubridores franceses y rusos respectivamente, establecieron el vínculo entre la actividad mental y la EDA, por un lado, y sentaron las bases metodológicas de la utilización moderna de este neuromarcador, por el otro. Este legado, asociado con medidas neuronales centrales, promete un futuro en expansión en neuropsicología, psicopatología, neurología, criminología y en neurociencia cognitiva y afectiva.