Efectos de la expresión emocional y de la orientación del rostro sobre las respuestas conductuales y el componente N170 / Effects of emotional expresión and orientation of faces on behavioral and on N170 component

Resumen En este estudio se pretendió corroborar el efecto de inversión con estímulos de rostros calmos, de miedo e ira tomados de la base de datos de rostros calmos y emocionales NSTIM (base de datos de rostros), presentados de forma vertical e invertida, con una duración de presentación de 2000 milisegundos. Los resultados muestran que no hubo modulación del componente N170 tanto en latencia como en amplitud ante la presentación de rostros invertidos comparados con los rostros presentados verticalmente. Tampoco se encontró alteración en la precisión de la respuesta y demora en los tiempos de reacción ante los rostros invertidos comparados con los rostros verticales. Estos resultados probablemente se pueden explicar por la presentación prolongada de los rostros invertidos que permitieron a los participantes tener el tiempo para reorganizar los elementos que componen los rostros. El aporte de este estudio es poner en evidencia que el tiempo de presentación de rostros invertidos es crucial para que se presente el efecto de inversión de rostros, el cual debe estar entre 200 y 500 milisegundos.

Abstract The aim of this study was to confirm the inversion effect with calm, fear and anger faces taken from calm and emotional NSTIM (face database) face database presented in upright and upside down position. The duration of the stimuli was 2000 ms. There was no modulation in latency or amplitude of the N170 component for inverted faces. There was no alteration in accuracy and reaction times in inverted faces compared to vertical faces. These results could be explained by the long presentation of the inverted faces that probably permitted the participants to reorganize the elements that compose the face. The contribution of this study is to demonstrate that the time presentation of the inverted faces between 200 and 500 ms is crucial for the FIE to appear.

Behavioral study of facial inversion effect and priming effect / 中华行为医学与脑科学杂志

Objective To compare the cognitive difference of subjects'responses to the same visual stimuli under two different priming conditions,and to discuss the influence of inversion effect and configural changes upon facial recognition.Methods Priming pattern was employed,and subjects were induced to recognize the same stimuli as schematic faces or three English letters under different priming conditions.The participants'accuracy and reaction times were compared in two priming conditions. Results Participants'accuracy of the comparison stimuli in facial priming condition decreased significantly by inversion effect((79.03±10.53)%vs(89.43±9.98)%,P0.05).Correlations of accuracy to reaction times reached no significant difference under two conditions.Conclusion Priming effect make sense in the cognition,and there was a priming stage before the facial configuration.Inversion effect shows up in the face priming condition,and vanish in the English letter priming condition,which demonstrate the importance of configuration and inversion effect in the facial cognition.What's more,such effect can't be explained by the changes of cognitive difficulty.