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https://www.sciencedirect.com/science/article/pii/S0960982212005945

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Summary

Learning and memory of music involves a multitude of perceptual, motor, affective, and autobiographical memory processes [1]. Patient and imaging studies suggest that musical memory may involve distinct neural substrates 2, 3. However, the degree of independence of such a system from other memory domains is controversial [4]. We have investigated a 68-year-old professional cellist, patient PM, who developed severe amnesia following encephalitis. This case provided a unique opportunity to study musical memory in a patient with a precisely defined premorbid musical knowledge and well-demarcated focal lesions of the brain. Despite severe memory impairments, he performed like healthy musicians in various tests of recognition memory for music. These findings suggest that learning and retention of musical information depends on brain networks distinct from those involved in other types of episodic and semantic memory.

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Preservation of musical memory in an amnesic professional cellist

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Learning and memory of music involves a multitude of perceptual, motor, affective, and autobiographical memory processes [1]. Patient and imaging studies suggest that musical memory may involve distinct neural substrates 2, 3. However, the degree of independence of such a system from other memory domains is controversial [4].

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- Procedural emmory tasks in patients with retrograde/anterograde amnesia

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Some things you might want to think about when developing your Padlet

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Some things you might want to think about when developing your Padlet

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what’s the reasoning behind selecting this example? is there already evidence to support your example that you can draw upon? And if there isn’t, what types of studies might you run to test your ideas? You might also think through whether there any theories that make predications consistent with the example you have offered.

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https://books.google.co.uk/books?hl=en&lr=&id=5l-pDwAAQBAJ&oi=fnd&pg=PA138&dq=Preserved+Musical+Instrument+Playing+in+Dementia:+A+Unique+Form+of+Access+to+Memory+and+the+Self+&ots=uRbSNwZ1hN&sig=VAFGtlDAJJpLgCjdpzISDpZdWZI&redir_esc=y#v=onepage&q&f=false

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Dementia is the most significant health issue facing our aging population. With no cure to date, there is an urgent need for the development of interventions that can alleviate symptoms of dementia and ensure optimal well-being for people with dementia and their caregivers.

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1. Introduce the Difference between
=> Knowing How & Knowing That
2. Explain what Dissociation is
3. Introduce what Dementia is
4. Dementia study about the Choir
=> Explain who they are and how dissociation of knowing how and knowing that is demonstrated through the choir.
5. Conclusion: what does this mean for psychology and why is this relevant and important

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Abstract

We report a double dissociation between visuo-spatial abilities and semantic knowledge (knowledge of the names and attributes of objects and people), in two brain-injured people with longstanding stable impairments, using a wide range of tests to explore the extent of the dissociation. MU, who has bilateral lesions of occipito-parietal cortex, shows severe spatial disorientation with relatively well-preserved semantic knowledge. He is contrasted with JBR, who has bilateral temporal lobe damage and shows severe semantic problems and no impairment on visuo-spatial tasks. Our findings thus demonstrate a double dissociation between the performance of semantic and spatial tasks by MU and JBR. This pattern is consistent with Ungerleider and Mishkin's (1982) neurophysiological hypothesis of separable cortical visual pathways; one which is specialised for spatial perception and follows a dorsal route from occipital to parietal lobes, and the other following a more ventral route from occipital to temporal lobes, whose target is semantic information needed in specifying what an object is.

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Knowing where and Knowing What: A Double Dissociation

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We report a double dissociation between visuo-spatial abilities and semantic knowledge (knowledge of the names and attributes of objects and people), in two brain-injured people with longstanding stable impairments, using a wide range of tests to explore the extent of the dissociation.

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https://academic.oup.com/book/36840/chapter/322017974

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Preserved Musical Instrument Playing in Dementia: A Unique Form of Access to Memory and the Self

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AbstractThe ability to play a musical instrument can remain in people with dementia, despite their cognitive impairment in other non-music domains. Case studies

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- https://pubmed.ncbi.nlm.nih.gov/16697429/

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Abstract

Patients affected by semantic dementia (SD) and other severe cognitive deficits may show preserved numerical skills, including the retrieval of multiplication facts from long-term memory. No studies so far specifically investigated the network of arithmetic facts in semantic dementia. Thus, it is unknown whether preserved multiplication in SD truly reflects intact semantic knowledge or preserved retrieval of verbal sequences (just as the recitation of rhymes or poems). In the present study a patient (SG) with SD underwent an extensive assessment of number processing and calculation abilities. In particular, multiplication knowledge was investigated through a series of computerised tasks (production task, multiple-choice task, number bisection task with multiplicative triplets, number-matching task). SG demonstrated excellent performance in all number processing and calculation tasks. In computerised tasks tapping multiplication fact knowledge, SG was as accurate and fast as healthy controls. Analyses on individual regression slopes indicated that SG's reaction time effects (problem-size effect, problem-difficulty effect, interference effects, and facilitation effect) were comparable to those found in controls in each task. These results add new evidence to the independence of numerical knowledge from other semantic information and provide further insight into the organisation of stored arithmetic knowledge.

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Knowing 7 x 8, but not the meaning of 'elephant': evidence for the dissociation between numerical and non-numerical semantic knowledge - PubMed

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Patients affected by semantic dementia (SD) and other severe cognitive deficits may show preserved numerical skills, including the retrieval of multiplication facts from long-term memory. No studies so far specifically investigated the network of arithmetic facts in semantic dementia. Thus, it is un ...

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- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5352997/

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Abstract

Introduction

Dissociation is a disruption in the integrated functions of consciousness, memory, identity, and perception. Dissociative symptoms include derealization/depersonalization, absorption, and amnesia. These experiences can cause a loss of control over mental processes, including memory and attention. In literature, there is a paucity of research concerning the relationships between dissociation and memory performance. In this study, our aim was to investigate the relationships between dissociative experiences, attention, and memory performance in a non-clinical community sample.

Methods

In this study, we examined the relationship between dissociation and cognitive dysfunction among 60 healthy volunteers. We administered the Wechsler Memory Scale-Revised, Auditory Verbal Learning Test, Stroop Color Word Interference Test, and Dissociative Experience Scale. Here we examined the relationships between the subtypes of dissociation and memory performance as assessed by neuropsychological tests.

Results

We found that verbal memory was negatively associated with dissociative experiences. Pathological dissociation, particularly amnesia and depersonalization/derealization, was reversely linked to general memory performance and long-term memory. Moreover, low dissociators reported higher scores on verbal memory, general memory performance, and long-term memory but lower scores on recognition than high dissociators.

Conclusion

The results of our study suggested that there are significant linkages between dissociative experiences and memory performance.

Keywords: Dissociative experiences, neuropsychological tests, cognitive functions, memory

INTRODUCTION

Dissociation is described as a discontinuity in the normally integrated functions of memory, identity, perception, experience, and consciousness ( 1, 2). Dissociative experiences include subjective phenomena such as amnesia, depersonalization, derealization, absorption, and identity alteration ( 3). It is a concept that ranges from minor experiences occurring in every individual's life to a major form of psychopathology. Some authors have argued that dissociation can be best understood in a continuum model that is present, to some degree, in everyone, and such symptoms can commonly be experienced at any time in the general population ( 4, 5). It has been found that 80-90% of individuals report dissociative symptoms at least some of the time ( 5). According to the taxonomic model of dissociation, dissociation may also occur in everyday life, but pathological dissociation arises in response to highly traumatic events as a trait response and refers to psychopathology ( 6).

Various theoretical models have been proposed to explain dissociative experiences. Some authors have argued that dissociation is a type of cognitive processing deficiency and is associated with a lack of successful integration of information ( 7, 8). Brunet et al. ( 9) noted that dissociative experiences may interfere with the processing of incoming information from the outside to the brain. It has also been proposed that dissociative experiences represent failures of the mental system to execute the integration of information at higher levels ( 10). According to this model, dissociation is an inability to control one's mental processes. A failure in cognitive control can lead to miscellaneous types of mental defects, including memory impairments, attention deficits, and misinterpretations of sensory perceptions. Therefore, some researchers believe that dissociative experiences affect neurocognitive functions ( 3, 4, 5).

Pierre Janet, one of the first people to define the major characteristics of dissociation, argued that dissociation is related to objective memory disturbances for emotional events ( 11). Furthermore, Giesbrecht et al. ( 12) conceptualized dissociation as disruptions of attention and memory, and they developed the Dissociative Experiences Scale (DES). There is a broad consensus in literature that memory deficits are core features of dissociation. According to some authors, the negative effects of dissociation on attention and memory are due to information processing disorders. Several studies have investigated the connections between dissociation and cognitive processes. This research was conducted on college students and patients with depersonalization disorder (DPD), dissociative identity disorder (DID), and borderline personality disorder and has largely provided support for the existence of linkages between cognitive failures and dissociation. Investigations of individuals with DID have suggested that they possess intact cognitive control under neutral conditions, but in minor anxiety-provoking situations, cognitive inhibition becomes degraded ( 13). Giesbrecht et al. ( 14) provided further evidence indicating a relationship between dissociation and poor cognitive inhibition during increasing levels of emotional stress or challenge. They observed that students with high DES scores experienced difficulties in suppressing thoughts while viewing emotional video fragments.

Freyd et al. ( 15) investigated the relationships between selective attention measured by the Stroop test and dissociation in a student sample. The groups with high DES scores showed greater Stroop interference. DePrince and Freyd ( 16) confirmed these results; in their study, the group of high dissociators demonstrated a greater degree of divided attention under attentional instructions and recalled fewer words than the low dissociators on a free-recall task. Based on these results, the authors argued that dissociative experiences can play a causal role in disrupted attentional control.

Research has provided evidence that high levels of dissociation are related to cognitive deficits. In contrast, other studies have shown no relationship between dissociation and cognitive functions. Guralnik et al. ( 17) could not find significant deficits on neuropsychological measures of attention and memory functions in patients with DPD. Similarly, Rossini et al. ( 22) reported that individuals with high dissociation had normal cognitive functions. Because of the contradictory findings, further studies are needed to understand the linkages between dissociation and cognitive functions. In this study, we aimed to investigate the associations of dissociative experiences in terms of absorption, amnesia, and depersonalization/derealization based on attention and memory performance.

METHODS

Participants and Procedures

Sixty healthcare workers (33 women, 27 men) were recruited as participants from Yüzüncü Yıl University, Faculty of Medicine Research Hospital. All individuals met the following inclusion criteria: 1. healthy volunteer, 2. not currently pregnant, 3. aged 20-35, 4. no use of any drug for psychiatric or major medical illness or insomnia, and 5. no history of substance abuse. The mean average age of the sample was 27.0 years, and the unbiased standard deviation was 4.36 years. Forty-five participants (75%) were university graduates, whereas 15 were high school graduates (25%). The study received approval from the University Ethical Committee.

The participants were briefly informed about the aim and procedures of the study. After the explanation of the research, each participant signed a written informed consent form. A set of neuropsychiatric tests was then administered by an experienced specialist psychologist in the psychiatry clinic of the Faculty of Medicine Research Hospital, and DES was concomitantly completed by the participants on their own. The average DES score of the sample was 15 (±10.7). The participants were classified as low and high (score of 20 or higher) dissociators ( 18).

Psychometric Instruments

DES

DES is a 28-item self-response screening measure that examines dissociative experiences in daily life. The Turkish version of DES has a reliability and validity equal to its original form ( 23). Factor analysis showed that the measure has three subscales of depersonalization and derealization, amnesia and absorption, and imaginative involvement ( 4, 24).

Neuropsychological Tests

In order to evaluate cognitive functions, the Wechsler Memory Scale, Auditory-Verbal Learning Test, and Stroop Test were administered to the participants by a clinical psychologist. The neuropsychological testing took approximately 40-45 min.

Wechsler Memory Scale-Revised

The Wechsler Memory Scale-Revised (WMS-R) is designed to assess both immediate and delayed verbal and visual memory, attention, and concentration ( 25). This comprehensive neuropsychological test battery is generally regarded as one of the best clinical memory tests in use. The attention and concentration, visual and verbal memory, delayed recall, and general memory subtests of WMS-R were administered to the participants.

Auditory Verbal Learning Test

The Rey Auditory Verbal Learning Test (RAVLT) ( 26) is a widely used clinical and research tool that examines the different aspects of verbal memory components, including immediate, delayed, and free recall; learning rate; retroactive interference; and recognition in adults. It involves repeated auditory presentations and recalls of 15 unrelated words. The test is a useful tool for diagnosing memory disturbances. The validity and reliability of the Turkish version of AVLT were determined by Öktem ( 27).

Stroop Color Word Interference Test-TBAG Form

The Stroop Color Word Interference Test-TBAG Form is a measure of selective attention and mental sets or cognitive shifting ability with changing task demands. It also measures the inhibition of habitual behavior patterns and the presence of unusual behavior (interference). A higher interference score indicates poorer performance. These functions mainly represent those of the frontal lobes ( 27). This test has been adapted and standardized for the Turkish population.

Statistical Analysis

Associations between dissociative experiences and neuropsychological test performances were assessed by running Pearson moment-product correlation coefficients. Low and high dissociators were determined with a cut-off score of higher than 20. Comparisons between the low and high dissociators were conducted using analysis of variance (ANOVA). The statistical significance threshold was p<0.05.

RESULTS

As shown in Table 1 , the associations between the dissociative experience scale, subscales, and neuropsychological tests were examined statistically using Pearson correlation analysis. Significant negative correlations between dissociation subtypes and the verbal memory subscale of WMS were found. The amnesia and depersonalization/derealization subscales of DES were negatively associated with general memory performance. The delayed recall scale of WMS was also reversely linked to amnesia. Long-term memory was reversely associated with the amnesia and depersonalization/derealization subscales of DES. However, dissociative experiences were positively connected with the recognition scale of AVLT.

Table 1

Dissociative experiences scale

Depersonalization-derealization

DES

Amnesia

Absorption

The Wechsler Memory Scale - Revised

Verbal memory

−0.50**

−0.51**

−0.46**

−0.47**

Delayed recall

−0.41**

−0.46**

−0.33*

−0.42**

General memory performance

−0.42**

−0.35*

−0.35*

−0.45**

The Auditory Verbal Learning Test

Long term memory

−0.34*

−0.35*

−0.25

−0.43**

Recognition

0.34*

0.34*

0.25

0.43**

The Stroop Color Word Interference Test

Duration

0.20

0.40*

0.05

0.22

We also compared the scores of neuropsychological tests between the low and high dissociators using ANOVA models. High dissociators scored significantly lower than the low dissociators on the verbal memory [F(1, 58)=13.332; p<0.01], delayed recall [F(1, 58)=5.473; p<0.05], and general memory performance scales of WMS [F(1, 58)=11.348; p<0.01]. The low dissociators also demonstrated better performance than the high dissociators on the long-term memory scale of AVLT [F(1, 58)=7.222; p<0.01]. However, the high dissociators scored higher than the low dissociators on the recognition scale of AVLT [F(1, 58)=8.676; p<0.01]. The results are presented in Table 2 and Figures 1 and ​and2 2 .

Table 2

DES categories

Low dissociators (n=45)

High dissociators (n=15)

F (1, 58)

P

η²

Mean

SD

Mean

SD

Wechsler Memory Scale-Revised

Auditory Verbal Learning Test

Stroop Color Word Interference Test

DISCUSSION

Our study examined the relationships between dissociation and cognitive dysfunction among healthy volunteers. Our hypothesis was that dissociation scores were negatively correlated with neuropsychological test performance. Consistent with our expectations, we found that greater levels of dissociation were significantly associated with worse performance in the verbal memory, delayed recall, general memory, and long-term memory indicators. Contrary to our hypothesis, we could not detect significant relationships between dissociative tendencies and test performance in the attention-concentration and Stroop tasks. These findings supported the significant associations of dissociative tendency with memory performance but not with attention. Dissociation, particularly the pathological dissociation of amnesia and depersonalization/derealization, was a significant antecedent of disruptions in the long-term and working memory functions.

Our findings suggest that there are multiple possible connections between dissociation and different types of memory. Although there were strong inverse associations between dissociation scores and verbal memory, no significant relationship between dissociation and visual memory was found. DeRuiter et al. ( 33) investigated verbal working memory using the verbal working memory span test in undergraduates. They indicated that highly dissociative individuals demonstrated poorer verbal memory performance than low or moderate dissociative individuals. In contrast, Velman et al. ( 34) found that in a nonclinical sample, high dissociators exhibited superior performance than low dissociators on verbal working memory tasks. Dissociative symptomatology is a central feature in post-traumatic stress disorder (PTSD) ( 35, 36), and several studies have demonstrated that verbal memory deficits are salient in this disorder ( 37, 38, 39). These studies have also found unsubstantial differences in visual memory across groups of individuals and without PTSD. Scholars have noted that dissociation is associated with specific deficits in verbal memory. The dual representation theory of PTSD proposes that traumas experienced after early childhood give rise to two types of memory, verbally accessible and situationally accessible, through appropriate situational cues. The non-verbal (situationally accessible memory) system is quite primitive, and sensory messages pass very rapidly through it along subcortical pathways, particularly through the amygdala. In contrast, the verbally accessible memory system is more complex. Sensory signals pass to the cerebral cortex and are analyzed in much more detail, particularly by the hippocampus. Functioning of the amygdala generally appears to be enhanced as stress increases, whereas intense stress associated with cortisol tends to impair the functioning of the hippocampus ( 40, 41). Although our sample consisted of non-clinical participants and we did not assess their prior traumatic experiences, our results provided further evidence to support the postulates of the dual representation theory. Verbal memory performance was negatively associated with subtypes of dissociation, whether pathological or non-pathological.

The difference in verbal and visual memory functions may also be linked to hemispheric lateralization. It has been reported that verbal memory is related to the left and visual memory to the right hippocampus ( 42). The authors investigated the hypothesis that dissociative symptoms may result from a dysfunction of hemispheric interaction. Bob ( 43) reported that dissociative experiences may occur with interhemispheric competition and dissociation of cerebral hemispheres. Spitzer et al. ( 44) examined whether there is a relationship between dissociation and interhemispheric structural asymmetry. The investigators discovered that high dissociators had a significantly lower left hemispheric excitability than right hemispheric excitability. Using electroencephalography, Ashworth et al. ( 45) revealed that there were changes in readings associated with attention and cognitive processes, reflecting the different cortical network interactions. They also demonstrated that participants scoring high in dissociation exhibited left hemispheric lateralization. These findings suggest that dissociation involves a cortical asymmetry with a left hemispheric superiority or a lack of right hemispheric integration.

Contrary to our expectations, the recognition subscale of AVLT was positively correlated with the DES, amnesia, and depersonalization scores. Previous studies generally argued that individuals with high dissociative tendencies may have cognitive disturbances ( 15, 16), but the current results suggest that high dissociative tendencies are advantageous under some conditions. The results of the study examining the relationship between dissociation and verbal working memory span in college students indicated that the high dissociator group had a larger verbal memory span than the low dissociator group. In addition, Cloitre et al. ( 47) investigated the relationship between dissociation and cognitive avoidance using positive, negative, and neutral stimuli in patients with a history of abuse. The researchers found that higher levels of dissociation were related to superior memory performance for representative stimuli. Moreover, higher levels of dissociation were also related to a greater recall of words. They suggested that "high levels of dissociation may be associated with superior explicit memory retrieval processes as a result of enhanced attentional processing" ( 48). Given the current relationships between dissociation and recognition performance, it seems that dissociative tendencies play a facilitating role in the retrieval process in non-clinical individuals without psychopathology.

This study has several shortcomings. First, the Structured Clinical Interview for DSM-IV Axis I Disorders was not used to exclude any Axis I disorders. Second, our sample size was relatively small; thus, our findings should be reexamined using more representative samples. Third, only healthy individuals participated in the study, so our findings could not be generalized to clinical groups.

In conclusion, the purpose of this study was to examine the influence of dissociation on both memory and attention functions. Our results suggest that the relationships between cognitive functions and dissociation have multiple features. Dissociative mechanisms can directly affect memory and attentional processes. However, the levels of dissociation are distinctly associated with different aspects of memory functions. These relations and the differences in these associations should be investigated in clinical groups.

Acknowledgments

The authors would like to thank clinical psychologist Songül Gündogdu Kiran for administering the neuropsychological tests.

Footnotes

Conflict of Interest: No conflict of interest was declared by the authors.

Financial Disclosure: The authors declared that this study has received no financial support.

Articles from Archives of Neuropsychiatry are provided here courtesy of Turkish Neuropsychiatric Society

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The Relationships Between Dissociation, Attention, and Memory Dysfunction

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Dissociation is a disruption in the integrated functions of consciousness, memory, identity, and perception. Dissociative symptoms include derealization/depersonalization, absorption, and amnesia. These experiences can cause a loss of control over mental processes, including memory and attention. In literature, there is a paucity of research concerning the relationships between dissociation and memory performance.

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Present a case study of where
- knowing HOW & knowing THAT are dissociated in the real world using an example NOT covered in the lecture slides.