Assessment of visual working memory using event-related potentials

Harker, K. Troy; Connolly, John F.

doi:10.1016/j.clinph.2007.07.026

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…To evaluate this, we administered a test of visual memory to all older participants outside of the scanner (computerized version of the CVMT (Harker and Connolly, 2007). The CVMT is a test of visual recognition memory that uses complex, ambiguous shapes that are not easily susceptible to verbal labeling.…”

Section: Resultsmentioning

confidence: 99%

Diminished Top-Down Control Underlies a Visual Imagery Deficit in Normal Aging

Kalkstein¹,

Checksfield²,

Bollinger³

et al. 2011

J. Neurosci.

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Mental imagery is involved in a wide variety of cognitive abilities, including reasoning, spatial navigation, and memory. Cognitive aging is associated with impairments in these abilities, suggesting diminished fidelity of mental images in older adults may be related to diverse cognitive deficits. However, an age-related deficit in mental imagery and its role in memory impairment is still a matter of debate. Previous human fMRI studies demonstrated that visual imagery activates representations in category-selective visual cortex via top-down control mechanisms. Here, we use fMRI to show that normal aging is associated with diminished selectivity of visual cortex activation during visual imagery, with a corresponding reduction in the selectivity of functional connections between prefrontal cortex and visual cortices. Moreover, a relationship between reduced imagery selectivity and visual memory in older adults was established. These results reveal that aging disrupts neural networks that subserve mental imagery and offers evidence of this as a factor in age-related memory decline.

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Section: Resultsmentioning

confidence: 99%

Diminished Top-Down Control Underlies a Visual Imagery Deficit in Normal Aging

Kalkstein¹,

Checksfield²,

Bollinger³

et al. 2011

J. Neurosci.

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“…The new and old effects and repetition effect were observed in ERP, as a positive shift after 200-ms stimulation, as shown by studies on memory extracting function by using direct or indirect recognition scale [10,11] . When the ERP was used for studying the effect of Chinese characters' recognition, visual stimulation mainly induces P 180 , N350 and positive slow wave and the learned Chinese characters induced a positive change in the range between 300 ms to 600 ms compared to unknown words, while positive components of ERP are more obvious on the parietal midline (Pz) [12] .…”

Section: Discussionmentioning

confidence: 90%

Correlations between event-related potentials with pictures recognition and WMS-RC scores in patients with memory disorder caused by severe traumatic brain injury

Liu

Fan

et al. 2008

J. Huazhong Univ. Sci. Technol. [Med. Sci.]

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This study explored the possibility of using event-related potentials (ERP) for the measurement of picture-recognition memory and examined its correlation with the Chinese Wechsler Memory Scale-revised (WMS-RC) in patients with memory disorder caused by severe traumatic brain injury (sTBI). The subjects included 20 sTBI patients with memory disorder and 22 healthy individuals. Memory function was measured by using WMS-RC. Behavioral and ERP responses were recorded on-line during performance on a battery of picture recognition and the responses were analyzed off-line for recognition memory effects. Mean memory quotient (MQ) of patients with sTBI was significantly lower than that of the control group. Mean reaction time (RT) was significantly longer and the mean correctness rate (CR) of picture recognition was significantly lower in sTBI group than that of the controls. In controls, the main components of average ERP of picture recognition includes two positive-going waves, designated as P(170) and P(500), that appear 170 ms and 500 ms after stimulation when the subject could later successfully recall and recognize the pictures. P(500) amplitude of target stimulus was significantly higher than that of non-target stimulus. Compared to controls, P(500) responses of sTBI group were significantly delayed in latency (P<0.001) and lower in amplitude (P<0.001). P(500) latency showed significant negative correlation with MQ and the scores of "addition", "visual recognition", "picture recall", "visual reproduction" and "tactile memory" in WMS-RC. ERP of picture recognition provides a neurophysiological approach to directly assess memory impairment, and P(500) may serve as a helpful index for memory disorder caused by sTBI in forensic practice.

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“…The only similarity among all studies is that the results have shown the different brain activity patterns. Harker and Connolly (2007) involved participants aged between 23 and 24 years old for their studies and the results for ERPs showed a contribution linked to both functional and neurophysiological profiles. Regarding on previous research, this study more focus on the subject from 6 to 12 years old.…”

Section: Discussionmentioning

confidence: 99%

Event-Related Potentials Extraction of Working Memory Using Wavelet Algorithm

Tumari

Sudirman²,

Ahmad³

2014

Journal of Computer Science

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This study was designed to classify and determine the Event-Related Potentials (ERPs) signal pattern of normal children on visual response. Thirty-eight children aged between 10 to 12 years old were subjected to a two-phase computer-based assessment while their working memory activity was recorded using a Neurofax-EEG 9200 machine. For children, it is anticipated that some information can be lost when there is too much information given at any one time due to limited memory capacity and this is a type of memory impairment. Based on the visual stimulus responses, EEG signal were recorded and captured from channel location at Fz. This paper explains the extraction of raw EEG signals into grand mean ERPs signal which to determine the pattern of signal developed. The ERPs concerning latency and amplitude variability of the P300 component was evaluated. The analysis was based on Discrete Wavelet Transform (DWT) algorithm and focused on alpha rhythm. Results indicated that the Daubechies wavelet at a decomposition level of 4 (db4) was the most suitable wavelet for pre-processing raw EEG signal of working memory. A significant increase of latency was detected in children aged 10 to 12 years old at channel Fz (frontal midline) when the visual stimuli became more difficult. For amplitude variability, the girls gave higher amplitude at Phase 1. These results supported the concept of increased cognitive memory in children.

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Assessment of visual working memory using event-related potentials

Cited by 9 publications

References 26 publications

Diminished Top-Down Control Underlies a Visual Imagery Deficit in Normal Aging

Diminished Top-Down Control Underlies a Visual Imagery Deficit in Normal Aging

Correlations between event-related potentials with pictures recognition and WMS-RC scores in patients with memory disorder caused by severe traumatic brain injury

Event-Related Potentials Extraction of Working Memory Using Wavelet Algorithm

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