A system for evaluating a mental health disorder in a human subject, the system comprising: a display device configured to present a series of natural test images (10, 18) to the subject； an input through which the subject can enter a response, after the display of each test image, with respect to whether or not the image satisfies a previously determined classification criteria； control processor configured to control the display of the test images by the presentation device, to measure the duration of time from the moment in which each test image is initially presented to the moment in which the subject enters the corresponding response, and to generate a set of response data that includes the response times with respect to each of the test images； and a data processor configured to process the response data set and to compare the processed response data with reference data to assess whether or not the subject has, or is likely to develop, the mental health disorder, characterized in that The control processor is configured to produce the presentation to display each test image (10, 18) for a duration of the order of 10 ms, followed by a blank screen (12, 20) for a duration of the order of 10 ms, followed by a masking with noise (14, 22) for a duration of the order of 100 ms or greater.Un sistema para evaluar un trastorno de salud mental en un sujeto humano, el sistema comprendiendo: un dispositivo de visualización configurado para presentar una serie de imágenes de ensayo naturales (10, 18) al sujeto；una entrada mediante la cual el sujeto puede entrar una respuesta, después de la visualización de cada imagen de ensayo, con respecto a si la imagen satisface o no un criterio de clasificación determinado previamente；procesador de control configurado para controlar la visualización de las imágenes de ensayo por el dispositivo de presentación, para medir la duración del tiempo desde el momento en el que cada imagen de ensayo se presenta inicialmente al momento en el q
