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Las percepciones ilusorias del espacio y el tiempo preservan la continuidad perceptiva cruzada y sacádica
1Sobell Department of Neurophysiology, Institute of Neurology, 8-11 Queen Square, London WC1N 3BG, UK. k.yarrow@ion.ucl.ac.uk
Nature
|November 20, 2001
Resumen
El cerebro extiende la percepción visual hacia atrás en el tiempo durante los movimientos saccádicos de los ojos, causando la ilusión de la cronoestasis. Esta extensión temporal de la percepción del objetivo está relacionada con el mantenimiento de la estabilidad espacial durante los movimientos oculares.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Psicología de la percepción Psicología de la percepción.
- Ciencias Cognitivas Ciencias Cognitivas.
Sus antecedentes:
- Los movimientos saccádicos de los ojos son movimientos rápidos y balísticos de los ojos.
- La cronostasis es una ilusión perceptiva en la que el tiempo parece ralentizarse o detenerse.
- La supresión sacádica limita el procesamiento visual durante los movimientos oculares.
Objetivo del estudio:
- Investigar los mecanismos subyacentes a la ilusión de la cronoestasis durante los movimientos voluntarios saccádicos de los ojos.
- Para determinar si la percepción temporal se altera antes del inicio de la sacada.
- Explorar el papel de la atención espacial y la continuidad del objetivo en la cronostasis.
Principales métodos:
- Los participantes hicieron movimientos saccádicos voluntarios de los ojos hacia un reloj de tictac.
- Se registró la duración percibida del movimiento de la segunda aguja del reloj.
- Las condiciones experimentales manipularon el movimiento del objetivo y los cambios de atención espacial.
Principales resultados:
- La ilusión de la cronoestasis ocurre debido a que el cerebro extiende la percepción del objetivo sacádico hacia atrás en el tiempo.
- Esta extensión temporal ocurre con cada sacada, pero solo se percibe con una referencia temporal externa.
- La ilusión es independiente de los cambios de atención espacial, pero desaparece si se rompe la continuidad espacial objetivo.
Conclusiones:
- El cerebro extiende la percepción visual hacia atrás en el tiempo para "llenar" la brecha perceptiva durante la supresión sacádica.
- La cronostasis está vinculada de manera crítica a los mecanismos de percepción que aseguran la estabilidad espacial de un objetivo.
- Este hallazgo arroja luz sobre cómo el cerebro construye una experiencia visual continua a pesar de los rápidos movimientos oculares.
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