Eyeblink conditioning with a noise burst as unconditioned stimulus / Condicionamiento de la respuesta de parpadeo con una explosión de ruido como estímulo incondicionado

BACKGROUND: The aim of this study was to determine if a white noise burst could be used as an effective unconditioned stimulus (US) to produce differential conditioning of eyeblink responses that were recorded as EMG activity of the orbicularis oculi. METHOD: Two fear-relevant stimuli served as conditioned stimuli (CS). An angry woman's face (CS+) was consistently followed by a white noise burst (US) with 100 dB intensity and 100 milliseconds in duration. A fearful face of the same woman (CS-) was not followed by the US. CS duration was 500 milliseconds (ms) for 18 participants (long interval group), and 250 ms for 19 participants (short interval group). The US was presented in both groups immediately after terminating CS+. RESULTS: The results showed acquisition of differential conditioning in the long interval group, but not in the short interval group. CONCLUSIONS: These results suggest that a white noise burst as US could be used in one single experimental procedure which was capable of simultaneously producing conditioning in neural, autonomic and somatomotor response systems

ANTECEDENTES: el objetivo de este trabajo era determinar si una ráfaga de ruido blanco podía ser utilizada como un eficaz estímulo incondicionado (EI) para producir condicionamiento de la respuesta de parpadeo, que era registrada como actividad electromiográfi ca (EMG) del músculo orbicularis oculi. MÉTODO: dos estímulos relevantes de miedo servían como estímulos condicionados (EC). Un rostro enfadado de mujer (EC+) se presentaba siempre seguido por una explosión de ruido blanco (EI) con una intensidad de 100 dBs y 100 milisegundos de duración, mientras que otro rostro de la misma mujer con expresión de miedo (EC-) nunca iba seguido del EI. La duración del EC era de 500 milisegundos (ms) para 18 participantes (grupo de intervalo largo) y de 250 ms para otros 19 participantes (grupo de intervalo corto). El EI era presentado en los dos grupos inmediatamente después de la terminación del EC+. RESULTADOS: los resultados mostraron adquisición de condicionamiento diferencial en el grupo de intervalo largo, pero no en el grupo de intervalo corto. CONCLUSIONES: estos resultados sugieren que es posible utilizar una explosión de ruido blanco como EI en un único procedimiento experimental, que sería capaz de producir simultáneamente condicionamiento de respuestas del sistema nervioso central, autónomo y somático

Eyeblink conditioning with a noise burst as unconditioned stimulus.

BACKGROUND: The aim of this study was to determine if a white noise burst could be used as an effective unconditioned stimulus (US) to produce differential conditioning of eyeblink responses that were recorded as EMG activity of the orbicularis oculi. METHOD: Two fear-relevant stimuli served as conditioned stimuli (CS). An angry woman’s face (CS+) was consistently followed by a white noise burst (US) with 100 dB intensity and 100 milliseconds in duration.  A fearful face of the same woman (CS-) was not followed by the US. CS duration was 500 milliseconds (ms) for 18 participants (long interval group), and 250 ms for 19 participants (short interval group). The US was presented in both groups immediately after terminating CS+. RESULTS: The results showed acquisition of differential conditioning in the long interval group, but not in the short interval group. CONCLUSIONS: These results suggest that a white noise burst as US could be used in one single experimental procedure which was capable of simultaneously producing conditioning in neural, autonomic and somatomotor response systems.