Threat cues and attentional bias in blood-injection-injury phobia and snake phobia / Señales de amenaza y sesgo atencional en la fobia a la sangre, inyecciones y heridas y en la fobia a las serpientes

The aim of this research was to study the effect of a cue signalling the upcoming of a phobic picture on the electrocortical activity provoked by the disorder-relevant stimulus in in blood-injection-injury (BII) phobia and snake phobia. A sample of 13 BII phobia participants, 12 snake phobia individuals and 14 non-phobic controls underwent an S1-S2 task, where S1 was a word that described the content of a subsequent picture (blood-related, snake and neutral) that appeared 2 seconds later (S2). We obtained the P200 and P300 ERP amplitudes provoked by the pictures. Our results reveal that P200 did not differentiate between picture contents in BII phobia while, in contrast, snake and blood-related pictures provoked the largest responses in snake phobia participants. Both blood-related and snake pictures provoked greater P300 amplitudes than neutral pictures in all the groups. Threat cues reduced the electrocortical reaction of the BII phobia participants, possibly by the elicitation of anticipatory or regulatory responses. These results are indicative of a low automatic, exogenous attention towards the feared stimuli in BII phobia, as revealed by P200, probably related to a lack of attentional bias to the phobic object.(AU)

El objetivo de esta investigación fue estudiar el efecto de una señal que indica la aparición de una imagen fóbica sobre la actividad electrocortical provocada por el estímulo fóbico en personas con fobia a la sangre, inyecciones y heridas (SIH) y en fóbicos a las serpientes. Una muestra de 13 participantes con fobia SIH, 12 con fobia a las serpientes y 14 controles no fóbicos se sometieron a una tarea S1-S2, donde S1 era una palabra que describía el contenido de una imagen posterior (relacionada con sangre, serpientes o neutra) que aparecía 2 segundos después (S2). Obtuvimos las amplitudes de los potenciales evocados P200 y P300 provocados por las imágenes. Nuestros resultados revelaronn que P200 no diferenciaba entre el contenido de las imágenes en la fobia SIH mientras que, por el contrario, las imágenes relacionadas con serpientes y con sangre provocaron las mayores respuestas en los participantes con fobia a las serpientes. Tanto las imágenes relacionadas con sangre como las relacionadas con serpientes provocaron amplitudes de P300 mayores que las imágenes neutras en todos los grupos. Las señales de amenaza redujeron la reacción electrocortical de los fóbicos SIH, posiblemente porque desencadenaron respuestas anticipatorias o reguladoras. Estos resultados indican una baja atención exógena hacia los estímulos temidos en la fobia SIH, como lo revela P200, probablemente relacionada con una pérdida del sesgo atencional hacia su objeto fóbico.(AU)

Does Social Content Influence the Subjective Evaluation of Affective Pictures?

This study explored the effect of the perceived social content of affective pictures on the subjective evaluation of affective valence and arousal. For this purpose, we established three categories of social content (pictures without people, with one person and with two or more people). A sample of 161 subjects rated 200 pictures varying in affective valence (unpleasant, neutral, and pleasant), arousal and social content. Results of two-factor analysis of variance, F(4, 157) = 71.7, p < .001, ηp2 = .31, showed that perceived social content influenced the ratings of affective valence, specially for unpleasant pictures, with the greatest social content (two or more people) leading subjects to rate unpleasant pictures with the lowest ratings (all pairwise comparisons' p < .001). Regarding arousal, F(4, 157) = 64.0, p < .001, ηp2 = .29), the higher the social content, the higher the arousal ratings, but only for pleasant (all pairwise comparisons' p < .007) and unpleasant (all pairwise comparisons' p < .001) pictures. Overall, this study demonstrated an effect of the perceived social content on the subjective evaluation of affective valence and arousal of emotional stimuli.

Does social content influence the subjective evaluation of affective pictures?

This study explored the effect of the perceived social content of affective pictures on the subjective evaluation of affective valence and arousal. For this purpose, we established three categories of social content (pictures without people, with one person and with two or more people). A sample of 161 subjects rated 200 pictures varying in affective valence (unpleasant, neutral, and pleasant), arousal and social content. Results of two-factor analysis of variance, F(4, 157) = 71.7, p < .001, ηp2 = .31, showed that perceived social content influenced the ratings of affective valence, specially for unpleasant pictures, with the greatest social content (two or more people) leading subjects to rate unpleasant pictures with the lowest ratings (all pairwise comparisons' p < .001). Regarding arousal, F(4, 157) = 64.0, p < .001, ηp2 = .29), the higher the social content, the higher the arousal ratings, but only for pleasant (all pairwise comparisons' p < .007) and unpleasant (all pairwise comparisons' p < .001) pictures. Overall, this study demonstrated an effect of the perceived social content on the subjective evaluation of affective valence and arousal of emotional stimuli

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Head Motion Elicited by Viewing Affective Pictures as Measured by a New LED-Based Technique.

The complex sensory input and motor reflexes that keep body posture and head position aligned are influenced by emotional reactions evoked by visual or auditory stimulation. Several theoretical approaches have emphasized the relevance of motor reactions in emotional response. Emotions are considered as a tendency or predisposition to act that depends on two motivational systems in the brain - the appetitive system, related to approach behaviours, and the defensive system, related to withdrawal or fight-or-flight behaviours. Few studies on emotion have been conducted employing kinematic methods, however. Motion analysis of the head may be a promising method for studying the impact of viewing affective pictures on emotional response. For this purpose, we presented unpleasant, neutral and pleasant affective pictures. Participants were instructed to view the pictures and to remain still. Two light-emitting diodes (LEDs) were attached to the foreheads of participants, and a Wii Remote controller, positioned 25 cm away, detected the position of the LEDs in the medial-lateral and anterior-posterior axes. We found more sway in response to unpleasant pictures. In addition, unpleasant pictures also provoked faster movements than both neutral and pleasant pictures. This response to unpleasant pictures, in contrast to pleasant ones, might reflect the readiness or predisposition to act. Our data also revealed that men moved faster than women, which is in accordance with previous findings related to gender differences.

Effects of social and affective content on exogenous attention as revealed by event-related potentials.

The social content of affective stimuli has been proposed as having an influence on cognitive processing and behaviour. This research was aimed, therefore, at studying whether automatic exogenous attention demanded by affective pictures was related to their social value. We hypothesised that affective social pictures would capture attention to a greater extent than non-social affective stimuli. For this purpose, we recorded event-related potentials in a sample of 24 participants engaged in a digit categorisation task. Distracters were affective pictures varying in social content, in addition to affective valence and arousal, which appeared in the background during the task. Our data revealed that pictures depicting high social content captured greater automatic attention than other pictures, as reflected by the greater amplitude and shorter latency of anterior P2, and anterior and posterior N2 components of the ERPs. In addition, social content also provoked greater allocation of processing resources as manifested by P3 amplitude, likely related to the high arousal they elicited. These results extend data from previous research by showing the relevance of the social value of the affective stimuli on automatic attentional processing.

Autonomic reactivity in blood-injection-injury and snake phobia.

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.

Social stimuli increase physiological reactivity but not defensive responses.

Emotional reactions are crucial in survival because they provide approach and withdrawal behaviors. However, an unsolved question is whether the social content of the affective stimuli has a specific effect on emotional responses. We studied whether the social content of affective pictures influenced the defensive response and response mobilization. For this purpose, we recorded startle blink reflex (a defensive response) and skin conductance responses (a measure of unspecific physiological reactivity or arousal) in 73 participants while they viewed a series of 81 pictures of varying affective valence and social content. Our results revealed that defense response, as indicated by increases in the magnitude of the startle blink reflex, was mainly dependent on threatening or unpleasant cues, but was unrelated to the social content of the pictures. The social content, however, had an influence on pleasant stimuli, provoking an increase in resource mobilization, as reflected by changes in electrodermal activity. Hence, the social content of the affective stimuli may increase the physiological arousal elicited by pleasant stimuli, and it appears to be unrelated to the defense reactivity provoked by unpleasant stimuli.

Preattentive processing of feared stimuli in blood-injection-injury fearful subjects.

This research aimed to study the defence responses of blood-injection-injury (BII) fearful subjects elicited by the preattentive processing of their feared objects and by an abrupt acoustic stimulus. We selected 21 BII fearful subjects and 25 non-fearful controls from an initial sample of 128 women, according to their scores on the Fear Survey Scale (damage subscale) and the Mutilation Questionnaire. Subjects were exposed to a burst of white noise to promote a defence response, and to 48 pictures, depicting mutilations, as well as other affective contents, displayed through a backward masking procedure. Heart rate (HR), skin conductance response (SCR) and corrugator supercilii activity were continuously recorded throughout the task. Both groups showed similar SCRs, EMG activity and cardiac defence responses to the acoustic stimulus, though fearful subjects showed greater initial HR deceleration than controls. While BII fearful subjects displayed the usual defence response when exposed to a non-feared threatening stimulus, the preattentive processing of the pictures did not reveal autonomic differences between fearful subjects and controls. Mutilation pictures, however, evoked the greatest EMG activity, but only in the fearful group. These data further extend previous research on conscious perception of blood-related stimuli in BII fearful subjects, by showing a failure to recruit autonomic defence responses when blood-related pictures appear outside of conscious awareness.

Incidence of anovulatory menstrual cycles among dysmenorrheic and non-non-dysmenorrheic [corrected] women: effects on symptomatology and mood.

The incidence of spontaneous anovulatory (SA) menstrual cycles among dysmenorrheic and non-dysmenorrheic women and their effects on symptomatology and mood were examined in 52 university students distributed into two groups (18 dysmenorrheic women and 34 non-dysmenorrheic women) according to the presence or absence of symptoms of primary dysmenorrhea. Women were tested in menstrual, ovulatory and premenstrual phases. In order to estimate the proportion of ovulatory and SA cycles the basal body temperature (BBT) method was used. Results indicated that the percentage of SA cycles found in dysmenorrheic women does not confirm that primary dysmenorrhea only occurs in ovulatory cycles. In addition, the ovulatory cycles did not present greater symptomatology than the anovulatory cycles in self-rating of negative affect. In fact, menstrual symptomatology was not associated with ovulatory cycles. These data confirm that primary dysmenorrhea does not only depend on the endocrine factors which regulate the menstrual cycle but also on other factors such as social or psychological ones.

Incidence of anovulatory menstrual cycles among dysmenorrheic and non-dismenorrheic women: effects on symptomatology and mood / Incidencia de ciclos menstruales anovulatorios entre mujeres dismenorreicas y no dismenorreicas: efectos sobre sintomatología y humor

The incidence of spontaneous anovulatory (SA) menstrual cycles among dysmenorrheic and non-dysmenorrheic women and their effects on symptomatology and mood were examined in 52 university students distributed into two groups (18 dysmenorrheic women and 34 non-dysmenorrheic women) according to the presence or absence of symptoms of primary dysmenorrhea. Women were tested in menstrual, ovulatory and premenstrual phases. In order to estimate the proportion of ovulatory and SA cycles the basal body temperature (BBT) method was used. Results indicated that the percentage of SA cycles found in dysmenorrheic women does not confirm that primary dysmenorrhea only occurs in ovulatory cycles. In addition, the ovulatory cycles did not present greater symptomatology than the anovulatory cycles in self-rating of negative affect. In fact, menstrual symptomatology was not associated with ovulatory cycles. These data confirm that primary dysmenorrhea does not only depend on the endocrine factors which regulate the menstrual cycle but also on other factors such as social or psychological ones (AU)

La incidencia de ciclos menstruales anovulatorios espontáneos (SA) entre las mujeres dismenorreicas y no dismenorreicas y sus efectos sobre sintomatología y humor fueron examinados en 52 estudiantes universitarias distribuidas en dos grupos (18 dismenorreicas y 34 no-dismenorreicas) de acuerdo a la presencia o ausencia de síntomas de dismenorrea primaria. Las mujeres fueron evaluadas en las fases menstrual, ovulatoria y premenstrual. Para estimar la proporción de ciclos ovulatorios y SA se utilizó el método de la temperatura basal corporal (BBT). Los resultados indicaron que el porcentaje de ciclos SA encontrados en mujeres dismenorreicas no confirma que la dismenorrea primaria solo ocurra en ciclos ovulatorios. Además, los ciclos ovulatorios no presentaron mayor sintomatología que los ciclos anovulatorios en las medidas de autoinforme de afecto negativo. De hecho, la sintomatología menstrual no estuvo asociada con ciclos ovulatorios. Estos datos confirman que la dismenorrea primaria no solo depende de los factores endocrinos que regulan el ciclo menstrual, sino también de otros factores sociales o psicológicos (AU)