EEG dynamics reflects the partial and holistic effects in mental imagery generation

Abstract

Abstract:Mental imagery generation is essential in the retrieval and storage of knowledge. Previous studies have indicated that the holistic properties of mental imagery generation can be evaluated more easily than the partial properties. However, the relationship between partial and holistic mental imagery generations has not been clearly demonstrated. To address this issue, we designed a task to investigate the changes in the spectrum of the electroencephalogram (EEG) during partial or holistic imagery generation. EEG signals were obtained from 18 healthy subjects, and a statistical measure of spectral dynamics between two EEG signals in per frequency band was performed. Additionally, a bicoherence spectrum analysis was used to detect the phase coupling within these two imagery conditions. Our results indicated that EEG of the partial imagery appeared earlier and stronger than that of the holistic imagery in the theta (5-8 Hz) range in a time window around 220 to 300 ms after cue onset, and a slight decrease in the alpha (8-12 Hz) band was observed at around 270 ms. The scalp topography of these changes in the theta and alpha bands distributed overall significantly in the frontal and central-temporal areas. The significant phase coupling within two conditions was remarkable at high frequency. From these results, we infer that there are complex relations between partial and holistic imageries. The generation of partial mental imagery is not a subprocess of holistic imagery, but it is relevant to holistic imagery and requires correct modification from the holistic information.

Chemical and cytological evaluation of honeybee pollen antioxidant ability

“…For example, Wang et al (2014) used pollen water extracts, which is different from the current study, and thus obtained quite different results. Dong et al (2010) used pollen alcohol extracts; however, some of their results are different from the current study. By comparing the analytical methods and data analysis procedures, the differences in results are presumably due to differences in laboratory conditions, testing methods, data representation methods, and statistical methods.…”

“…A literature review revealed previous reports on the use of a chemical system to evaluate the antioxidant capacity of pollen extracts (Ozkan et al, 2017;Qiu et al, 2017;Saliha & Büşra, 2019). Dong, Zhang, Li, and Ren (2010) studied the in vitro antioxi-dant capacity of eight different pollen alcohol extracts and found that the DPPH radical scavenging capacity, total reducing power, and TAC were in the order of canola> rose> buckwheat; the hydroxyl radical scavenging capacity was in the order of canola> buckwheat> rose. Using the Kramer test method for different pollen alcohol extracts, the comprehensive antioxidant capacity was in the order of canola> rose> buckwheat.…”

Object Recognition in Mental Representations: Directions for Exploring Diagnostic Features through Visual Mental Imagery

“…Research in object-related mental imagery using EEG is comparatively scarce, but the work that has been done has been successfully used to decode motor imagery for the purpose of brain–computer interface control (e.g., Townsend et al, 2004 ; see Choi, 2013 for review), suggesting EEG is capable of distinguishing amongst general categories of imagined actions. In a marked and significant departure from the general trend to focus on holistic information within mental imagery, one study attempted to investigate the role of partial object information through changes observed in the EEG spectrum ( Li et al, 2010 ). Participants were shown gray line drawings of 60 common objects containing what the researchers defined as distinct, nameable, spatially discrete features.…”

“…Following a 4000 ms pause, participants were cued to generate a mental image of the previously viewed line drawing according to the displayed holistic or partial-image word cue. These lexical cues referenced either the canonical name of an entire object or the name of one of its semantically meaningful parts (e.g., the word “lamp” cued a holistic imagery condition, whereas “lamp shade” prompted imagery for only a specific region of the stimulus; Li et al, 2010 ). A button press on a response box indicated the starting time point for each imaginary episode.…”

Stress Perception Mediates the Relationship between Stress and Quality of Life among Chinese Police Officers

“…our research, we nd that PCS of police o cers in Yiwu is 43.72 ± 9.37, and MCS police o cers in Yiwu is 47.73 ± 6.20. According to the previous research of life quality of people in Chengdu(Li, et al,2010), the score of PCS is 51.2 ± 6.6, and the score of MCS is 49.9 ± 7.7. Thus, the scores of life quality of police o cers in Yiwu is lower than the norm in terms of PCS and MCS, which means the general level of life quality of police o cers in Yiwu is lower than normal people.…”