Keeping it short -: A comparison of methods for brief picture presentation
Keeping it short -: A comparison of methods for brief picture presentation
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DOI：
10.1111/j.0956-7976.2004.00667.x
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发表时间：
2004-04-01
影响因子：
8.2
通讯作者：
Öhman, A
中科院分区：
文献类型：
--
作者：
Wiens, S;Fransson, P;Öhman, A
研究表明，后向掩蔽是研究无意识心理过程的有力工具。传统上的研究使用阴极射线管 (CRT) 显示器或机械快门和幻灯片投影仪来呈现刺激，但最近的研究（主要是功能性磁共振成像，fMRI）已开始使用基于液晶显示器 (LCD) 和薄膜晶体管 (TFT) 技术的方法。然而，由于技术的差异，所有方法可能并不同样适合掩蔽。当比较各种方法在短时间内呈现图片的准确性时，LCD 和 TFT 呈现的准确性较差，但快门和 CRT 呈现的准确性较高。由于 CRT 会干扰功能磁共振成像的成像过程，因此我们建议使用机械快门。然而，我们的结果通常可能不适用于所有显示器，因此我们建议研究人员验证其显示器的呈现参数。此处描述的过程可能对此目的有用。
Research has shown that backward masking is a powerful tool for studying unconscious mental processes. Whereas studies have traditionally presented stimuli using cathode-ray tube (CRT) monitors or mechanical shutters together with slide projectors, recent studies (mainly in functional magnetic resonance imaging, fMRI) have begun to use methods based on liquid crystal displays (LCDs) and thin-film transistor (TFT) technology. However, because of differences in technology, all methods may not be equally suited for masking. When methods were compared for their accuracy in presenting pictures at short durations, LCD and TFT presentations had poor accuracy, but shutter and CRT presentations had better accuracy. Because CRTs interfere with the imaging process in fMRI, we recommend the use of mechanical shutters. However, our results may not generally apply to all displays, so we advise researchers to validate the presentation parameters of their displays. The procedure described here may be useful for that purpose.