Imagery processing in action memory–mental imagery is necessary to the subject-performed task effect

2020 ◽  
pp. 1-12
Author(s):  
Jialin Ma ◽  
Lijuan Wang ◽  
Lulu Chen ◽  
Yuhan Zhang
Keyword(s):  
Mental Imagery ◽  
Task Effect ◽  
Action Memory ◽  
The Subject ◽  
Imagery Processing

Graphical Illustration and Functional Neuroimaging of Visual Hallucinations during Prolonged Blindfolding: A Comparison to Visual Imagery

Perception ◽  
10.1068/p6034 ◽  
2008 ◽  
Vol 37 (12) ◽  
pp. 1805-1821 ◽  
Author(s):  
Ruxandra Sireteanu ◽  
Viola Oertel ◽  
Harald Mohr ◽  
David Linden ◽  
Wolf Singer
Keyword(s):  
Mental Imagery ◽  
Functional Neuroimaging ◽  
Brain Activity ◽  
Visual Hallucinations ◽  
Related Activity ◽  
Healthy Female ◽  
Posterior Parietal ◽  
The Subject ◽  
Moving Patterns ◽  
Healthy Female Subject

Visual hallucinations can occur in healthy subjects during prolonged visual deprivation. We investigated the visual percepts and the associated brain activity in a 37-year-old healthy female subject who developed visual hallucinations during three weeks of blindfolding, and then compared this activity with the cortical activity associated with mental imagery of the same patterns. We acquired fMRI data with a Siemens 3T Magnetom Allegra towards the end of the deprivation period to assess hallucination-related activity, and again after recovery from blindfolding to measure imagery-related activity. Detailed subjective descriptions and graphical illustrations were provided by the subject after blindfolding was completed. The subject reported the occurrence of simple and elementary hallucinations, consisting of flashes and coloured and moving patterns during the period of blindfolding. Neural activity related to hallucinations was found in extrastriate occipital, posterior parietal, and several prefrontal regions. In contrast, mental imagery of the same percepts led to activation in prefrontal, but not in posterior, parietal, and occipital regions. These results suggest that deprivation-induced hallucinations result from increased excitability of extrastriate visual areas, while mentally induced imagery involves active read-out under the volitional control of prefrontal structures. This agrees with the subject's report that visual hallucinations were more vivid than mental imagery.

scholarly journals Evaluating the subject-performed task effect in healthy older adults: relationship with neuropsychological tests

2015 ◽  
Vol 5 (1) ◽  
pp. 24068 ◽  
Author(s):  
Ana Rita Silva ◽  
Maria Salomé Pinho ◽  
Céline Souchay ◽  
Christopher J. A. Moulin
Keyword(s):  
Older Adults ◽  
Neuropsychological Tests ◽  
Healthy Older Adults ◽  
Task Effect ◽  
The Subject

scholarly journals Transient Activity in the Human Calcarine Cortex During Visual-Mental Imagery: An Event-Related fMRI Study

2000 ◽  
Vol 12 (supplement 2) ◽  
pp. 15-23 ◽  
Author(s):  
Isabelle Klein ◽  
Anne-Lise Paradis ◽  
Jean-Baptiste Poline ◽  
Stephen M. Kosslyn ◽  
Denis Le Bihan
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Mental Imagery ◽  
Visual Imagery ◽  
Mental Image ◽  
Functional Magnetic Resonance ◽  
Visual Mental Imagery ◽  
Fmri Study ◽  
Transient Activity ◽  
Imagery Processing

Although it is largely accepted that visual-mental imagery and perception draw on many of the same neural structures, the existence and nature of neural processing in the primary visual cortex (or area V1) during visual imagery remains controversial. We tested two general hypotheses: The first was that V1 is activated only when images with many details are formed and used, and the second was that V1 is activated whenever images are formed, even if they are not necessarily used to perform a task. We used event-related functional magnetic resonance imaging (ER-fMRI) to detect and characterize the activity in the calcarine sulcus (which contains the primary visual cortex) during single instances of mental imagery. The results revealed reproducible transient activity in this area whenever participants generated or evaluated a mental image. This transient activity was strongly enhanced when participants evaluated characteristics of objects, whether or not details actually needed to be extracted from the image to perform the task. These results show that visual imagery processing commonly involves the earliest stages of the visual system.

Tourist mental-imagery processing: Attention and arousal

2014 ◽  
Vol 45 ◽  
pp. 63-76 ◽  
Author(s):  
Sung-Bum Kim ◽  
Dae-Young Kim ◽  
Paul Bolls
Keyword(s):  
Mental Imagery ◽  
Imagery Processing

Duration of EEG and MEG α Suppression Increases with Angle in a Mental Rotation Task

1994 ◽  
Vol 6 (2) ◽  
pp. 139-150 ◽  
Author(s):  
Christoph M. Michel ◽  
Lloyd Kaufman ◽  
Samuel J. Williamson
Keyword(s):  
Reaction Time ◽  
Mental Imagery ◽  
Rotation Angle ◽  
Average Power ◽  
Mirror Image ◽  
Alpha Power ◽  
Imagery Task ◽  
Strong Correlations ◽  
Large Rotation ◽  
The Subject

Electric and magnetic recordings of average power within the high a band (10–12 Hz) were made over the parietal and occipital areas of the scalp while subjects were engaged in the mental imagery task of Cooper and Shepard. The subject had to determine whether an abstract probe figure was identical to a memory figure presented earlier at a different orientation, or whether it was the mirror image of the memory figure. Alpha power was found to be suppressed while the subjects were engaged in the comparison, and the duration of suppression increased with the minimum rotation angle to achieve a match. Strong correlations between suppression duration and reaction time give further evidence that the visual cortex is engaged in the process of mental imagery. Moreover, for large rotation angles of the probe figures, where the task is markedly more difficult, a shift in the spatial pattern of suppression indicates some additional activity in left occipital areas.

scholarly journals Sign theory at work: The mental imagery debate revisited

2015 ◽  
Vol 43 (4) ◽  
pp. 584-596 ◽  
Author(s):  
Jelena Issajeva
Keyword(s):  
Mental Imagery ◽  
Traditional Approach ◽  
Mental Image ◽  
Experimental Studies ◽  
Sign Theory ◽  
Sign System ◽  
Different Types ◽  
Imagery Debate ◽  
The Subject ◽  
Different Characteristics

This article attempts to give a plausible explanation to the long-debated question about the nature of mental imagery (MI). The traditional approach to this question is based on the representational paradigm, which, I claim, is misguided. Instead of representational aspects of mental imagery, I emphasize the functions of mental imagery, the variety of properties that images exhibit in experimental studies, and the relations between different characteristics of images, their functions and the subject of imagery. That is, I propose to account for mental imagery as a sign system, consisting of different types of signs. A mental image can contain important properties as parts of the complex sign. This approach to the explanation of the nature of MI is beneficial, since it suggests the phenomenon of mental imagery, which overcomes some long-standing controversies on the issue.

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