Razumnikova Olga M
Cognitive Physiology Laboratory, State Research Institute of Physiology of Siberian Branch Russian Academy of Medical Sciences, Novosibirsk State Technical University, Timakov Str. 4, 630117 Novosibirsk, Russia.
Brain Res Bull. 2007 Jun 15;73(1-3):96-102. doi: 10.1016/j.brainresbull.2007.02.008. Epub 2007 Mar 15.
The involvement of different oscillating neuronal systems during verbal creative thinking was investigated by multi-channel EEG measuring. The remote associates task (RAT) as a model of creative thinking in comparison to the resting condition and the simple associates task (SAT) was used. The EEG coherence along with spectral power density estimates were evaluated in each of the six frequency bands in 4-30 Hz range. We have found out RAT-related EEG changes mainly in the theta1, alpha1, alpha2 and beta2 bands. The RAT-induced cortical activation was differed from the SAT-induced EEG pattern by (i) widespread enhancement of power and coherence in the beta2, (ii) the theta1 power increase in the frontal cortex, and (iii) increased desynchronization of the alpha1,alpha2 mainly over posterior cortex together with the alpha1 coherence decrease in the prefrontal sites. Originality scores of the verbal associates positively correlated with an increase of coherence focused in the fronto-parietal regions of both hemispheres in the beta2 and in the left parieto-temporal loci in the alpha1. Additionally, more original responses positively correlated with amplitude of the alpha1 mostly in the left hemisphere. We propose that widespread cortical integration of multi-component internal processing has been simultaneously mediated during creative verbal thinking. The selectively distributed theta, alpha, and beta oscillations reflect intra- and inter-hemispheric communication networks with different functional relations to the RAT solving. The theta1 and alpha1 rhythms seem to specifically relate to top-down information processing such as deliberate sustained attention and working-memory-retention during defocused attention, respectively, whereas larger interregional synchrony in the beta2 band may mediate 'differential' attention to diffusely activating alternative meanings of words and remote associates from coarse semantic coding.
通过多通道脑电图测量，研究了言语创造性思维过程中不同振荡神经元系统的参与情况。使用远程联想任务（RAT）作为创造性思维的模型，并与静息状态和简单联想任务（SAT）进行比较。在4 - 30Hz范围内的六个频段中，对脑电图相干性以及频谱功率密度估计值进行了评估。我们发现与RAT相关的脑电图变化主要出现在θ1、α1、α2和β2频段。RAT诱导的皮层激活与SAT诱导的脑电图模式的不同之处在于：（i）β2频段功率和相干性的广泛增强；（ii）额叶皮层中θ1功率增加；（iii）α1、α2频段主要在顶叶后皮层的去同步化增加，同时前额叶部位α1相干性降低。言语联想的原创性得分与β2频段双侧额顶区域以及α1频段左侧顶颞区域相干性的增加呈正相关。此外，更多原创性反应与α1振幅大多在左半球呈正相关。我们提出，在创造性言语思维过程中，多成分内部加工的广泛皮层整合是同时介导的。选择性分布的θ、α和β振荡反映了与解决RAT具有不同功能关系的半球内和半球间通信网络。θ1和α1节律似乎分别特别与自上而下的信息处理相关，如在注意力分散时刻意持续的注意力和工作记忆保持，而β2频段更大的区域间同步性可能介导对词语扩散激活的替代含义和来自粗略语义编码的远程联想的“差异”注意力。
