Muñoz Francisco, Reales José M, Sebastián Miguel Ángel, Ballesteros Soledad
Department of Basic Psychology II, Universidad Nacional de Educación a Distancia, Madrid, Spain.
Department of Methodology, Universidad Nacional de Educación a Distancia, Madrid, Spain.
Brain Res. 2014 May 8;1562:59-68. doi: 10.1016/j.brainres.2014.03.013. Epub 2014 Mar 25.
This study investigated the neural mechanisms implicated in tactile perception using a discrimination task. We also investigated the influence of the type of presentation on the subject's uncertainty. The stimuli varied across four levels of roughness and were presented using a pure/mixed block design. We used an oddball paradigm with three target stimuli varying in the level of roughness, and a smooth surface as the non-target. Stimuli were presented using a specific-purpose device. We analyzed the modulation of the P300 amplitude elicited by targets and non-targets in both presentation conditions. The results showed that the P300 waveform was modulated by roughness, as well as by the order of stimuli presentation. The P300 amplitude was more sensitive to roughness when stimuli were presented in mixed blocks (higher uncertainty). The results are discussed in the context of the attention resources allocation theory applied to tactile modality.
本研究使用辨别任务探究了与触觉感知相关的神经机制。我们还研究了呈现类型对受试者不确定性的影响。刺激在四个粗糙度水平上变化，并采用纯/混合组块设计呈现。我们使用了一种oddball范式，其中有三个粗糙度水平不同的目标刺激，以及一个光滑表面作为非目标刺激。刺激通过专用设备呈现。我们分析了两种呈现条件下目标和非目标诱发的P300波幅的调制情况。结果表明，P300波形受到粗糙度以及刺激呈现顺序的调制。当刺激在混合组块中呈现（不确定性较高）时，P300波幅对粗糙度更敏感。研究结果在应用于触觉模态的注意力资源分配理论的背景下进行了讨论。
