Dog training alleviates PTSD symptomatology by emotional and attentional regulation.

Background: Post-Traumatic Stress Disorder (PTSD) symptoms include re-experiencing, avoidance, hyperarousal, and cognitive deficits, reflecting both emotional and cognitive dysregulation. In recent years, non-pharmacological approaches and specifically animal-assisted therapy have been shown to be beneficial for a variety of disorders such as Attention-Deficit/Hyperactivity Disorder, Autism Spectrum Disorder, and PTSD. However, little is mentioned in the literature about the reciprocal effects of the animal-human interaction. Objective: To evaluate the effects of a one-year dog training programme on PTSD symptomatology in youngsters with PTSD and on dogs' behaviour. Methods: Fifty-three adolescents, previously exposed to interpersonal trauma, were clinically diagnosed with PTSD and assigned to a dog-training programme group (n = 30) and a control group (n = 23) that engaged in other training programmes (e.g. cooking, hairstyling, etc.). Both groups were evaluated at baseline and following 12-months by The Clinician-Administered PTSD Scale for DSM-5 in Children and Adolescents (CAPS-CA-5) and Beck-Depression Inventory (BDI). Additionally, we physiologically measured both emotional and attention dysregulation. Results: Post-12-months training, a significant alleviation of PTSD symptomatology accompanied by lower depression severity was observed in the dog-training group, compared with a insignificant recovery in the control group. Furthermore, improved emotional and attentional regulation was observed in the dog-training group. Measuring the dogs' behaviour revealed increased anxiety and decreased selective attention performance, which was inversely correlated with the beneficial effects observed in the dog-training programme group. Conclusions: Our findings emphasize the role of emotional and attentional regulations on the dog-handler interface, as evidence-based support for the beneficial effects of the dog-training programme, as either a non-pharmacological intervention or as complementary to anti-depressants treatment of PTSD. Though pharmacological treatments increase the patients' well-being by treating certain PTSD symptoms, our suggested dog-training programme seems to influence the PTSD diagnostic status, thus may be implemented in civilians and veterans with PTSD.

Antecedentes: Los síntomas de trastorno de estrés postraumático (TEPT) incluyen re-experimentación, evitación, hiperalerta y déficits cognitivos, reflejando desregulación tanto emocional como cognitiva. En los últimos años, se demostró que los enfoques no farmacológicos y específicamente la terapia asistida por animales son beneficiosos para una variedad de trastornos como el Trastorno por Déficit Atencional e Hiperactividad, el Trastorno del Espectro Autista y el TEPT. Sin embargo, poco se menciona en la literatura acerca de los efectos recíprocos de la interacción animal-humano.Objetivo: Evaluar los efectos de un programa de adiestramiento canino de un año en la sintomatología de TEPT en los jóvenes con TEPT y en el comportamiento de los perros.Métodos: Cincuenta y tres adolescentes, previamente expuestos a trauma interpersonal, fueron diagnosticados clínicamente con TEPT y asignados a un grupo de programa de adiestramiento canino (n = 30) y a un grupo control (n = 23) que participaron en otros programas de adiestramiento (ej., cocinar, peluquería, etc). Ambos grupos fueron evaluados al inicio y después de 12 meses mediante la Escala de TEPT administrada por el Clínico del DSM-5 en niños y adolescentes (CAPS-CA-5 por sus siglas en inglés) y el Inventario de Depresión de Beck (BDI). Adicionalmente, medimos fisiológicamente la desregulación emocional y de la atención.Resultados: Después del entrenamiento de 12 meses, se observó un alivio significativo de la sintomatología de TEPT junto con una disminución de la severidad de la depresión en el grupo de adiestramiento canino, comparado con una recuperación insignificante en el grupo control. Además, se observó una mejoría en la regulación emocional y de la atención en el grupo de adiestramiento canino. La medición del comportamiento de los perros reveló un aumento de la ansiedad y disminución del rendimiento de la atención selectiva, que se correlacionó inversamente con los efectos beneficiosos observados en el grupo del programa de adiestramiento canino.Conclusiones: Nuestros hallazgos enfatizan el rol de la regulación emocional y de atención en la interfaz del entrenador de perros, como soporte basado en la evidencia para los efectos beneficiosos del programa de adiestramiento canino, tanto como tratamiento no farmacológico como complementario al tratamiento antidepresivo del TEPT. Aunque los tratamientos farmacológicos fomentan el bienestar de los pacientes al tratar ciertos síntomas del TEPT, nuestro programa de adiestramiento canino sugerido parece influir en el estado diagnóstico de TEPT, por lo que puede implementarse en civiles y veteranos con TEPT.

A probabilistic model of startle response reveals opposite effects of acute versus chronic Methylphenidate treatment.

BACKGROUND: The startle response is considered as the major physio-behavioral indication of anxiety in health and disease conditions. However, due to different protocols of stimulation and measurement, the magnitude as well as the appearance of the startle response is inconsistent. NEW METHOD: We postulate that the startle probability and not merely the amplitude may bare information that will form a consistent physiological measure of anxiety. RESULTS: To examine the proof-of-concept of our suggested probability model, we evaluated the effects of acute (single) versus chronic (14 days) MPH administration on both startle amplitude and probability. We found that both acute and chronic MPH administration has yielded similar effects on startle amplitude. However, acute MPH increased the startle's probability while chronic MPH decreased it. Next, we evaluated the effects of acute versus chronic stress on the startle's parameters and found a complementary effect. Explicitly, acute stress increased the startle's probability while chronic stress increased the startle amplitude. In contrast, enriched environment had no significant effects. Finally, to further validate the probability measure, we show that Midazolam had significant anxiolytic effects. In the second part, we investigated the acoustic startle response parameters (e.g. background noise and pulse duration), to better understand the interplay between these parameters and the startle amplitude versus probability. CONCLUSIONS: We show that the probabilistic element of the startle response does not only point to deeper physiologic relationships but may also serve as "hidden variables" congruent but not entirely identical to the commonly researched amplitude of the startle response.