Exploring bradyphrenia in Huntington’s disease using the computerized test of information processing (CTiP)
•The CTiP assesses reaction times for sub-tests of increasing cognitive difficulty.•The CTiP allows for the motor-corrected assessment of cognitive processing.•Intra-individual sub-test differences increase with Huntington’s Disease (HD) stage.•These differences may distinguish HD disease stage or p...
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Published in | Clinical parkinsonism & related disorders Vol. 10; p. 100243 |
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Language | English |
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01.01.2024
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Abstract | •The CTiP assesses reaction times for sub-tests of increasing cognitive difficulty.•The CTiP allows for the motor-corrected assessment of cognitive processing.•Intra-individual sub-test differences increase with Huntington’s Disease (HD) stage.•These differences may distinguish HD disease stage or progression.•These findings suggest the presence of bradyphrenia in HD.
Bradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson’s disease and schizophrenia; however, little is known about this phenomenon in Huntington’s Disease (HD).
The aim of this study was to investigate the presence of bradyphrenia in HD using the Computerized Test of Information Processing (CTiP), an easy to administer and objective task that assesses cognitive processing speed with increasing task complexity.
This study included 211 participants: Huntington’s Disease Integrated Staging System (HD-ISS) Stage 0 [n = 28], Stage 1 [n = 30], Stage 2 [n = 48] and Stage 3 [n = 48], and healthy controls (HC) [n = 57]. The CTiP incorporates three subtests: Simple Reaction Time (SRT), which assesses baseline motor function; Choice Reaction Time (CRT), with an added decisional component; and Semantic Search Reaction Time (SSRT), with an added conceptual component. SRT scores were subtracted from CRT and SSRT scores to establish a motor-corrected measure of central conduction time, which was used to operationalize bradyphrenia.
HD-ISS and HC within-group reaction times differed significantly when comparing motor-corrected CRT vs SSRT (all ps < 0.0001). Furthermore, the magnitude of these differences increased with HD disease stage (p < 0.0001). An ROC analysis determined that motor-corrected within-subject differences significantly distinguished Stage 2 + 3 from Stage 0 + 1 (AUC = 0.72, p < 0.0001).
We report evidence of bradyphrenia in HD that increases with disease progression. This processing deficit, which can be quantified using the CTiP, has the potential to greatly impact HD daily life and warrants additional research. |
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AbstractList | Bradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson's disease and schizophrenia; however, little is known about this phenomenon in Huntington's Disease (HD).
The aim of this study was to investigate the presence of bradyphrenia in HD using the Computerized Test of Information Processing (CTiP), an easy to administer and objective task that assesses cognitive processing speed with increasing task complexity.
This study included 211 participants: Huntington's Disease Integrated Staging System (HD-ISS) Stage 0 [n = 28], Stage 1 [n = 30], Stage 2 [n = 48] and Stage 3 [n = 48], and healthy controls (HC) [n = 57]. The CTiP incorporates three subtests: Simple Reaction Time (SRT), which assesses baseline motor function; Choice Reaction Time (CRT), with an added decisional component; and Semantic Search Reaction Time (SSRT), with an added conceptual component. SRT scores were subtracted from CRT and SSRT scores to establish a motor-corrected measure of central conduction time, which was used to operationalize bradyphrenia.
HD-ISS and HC within-group reaction times differed significantly when comparing motor-corrected CRT vs SSRT (all
s < 0.0001). Furthermore, the magnitude of these differences increased with HD disease stage (p < 0.0001). An ROC analysis determined that motor-corrected within-subject differences significantly distinguished Stage 2 + 3 from Stage 0 + 1 (AUC = 0.72, p < 0.0001).
We report evidence of bradyphrenia in HD that increases with disease progression. This processing deficit, which can be quantified using the CTiP, has the potential to greatly impact HD daily life and warrants additional research. BackgroundBradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson's disease and schizophrenia; however, little is known about this phenomenon in Huntington's Disease (HD).ObjectiveThe aim of this study was to investigate the presence of bradyphrenia in HD using the Computerized Test of Information Processing (CTiP), an easy to administer and objective task that assesses cognitive processing speed with increasing task complexity.MethodsThis study included 211 participants: Huntington's Disease Integrated Staging System (HD-ISS) Stage 0 [n = 28], Stage 1 [n = 30], Stage 2 [n = 48] and Stage 3 [n = 48], and healthy controls (HC) [n = 57]. The CTiP incorporates three subtests: Simple Reaction Time (SRT), which assesses baseline motor function; Choice Reaction Time (CRT), with an added decisional component; and Semantic Search Reaction Time (SSRT), with an added conceptual component. SRT scores were subtracted from CRT and SSRT scores to establish a motor-corrected measure of central conduction time, which was used to operationalize bradyphrenia.ResultsHD-ISS and HC within-group reaction times differed significantly when comparing motor-corrected CRT vs SSRT (all ps < 0.0001). Furthermore, the magnitude of these differences increased with HD disease stage (p < 0.0001). An ROC analysis determined that motor-corrected within-subject differences significantly distinguished Stage 2 + 3 from Stage 0 + 1 (AUC = 0.72, p < 0.0001).ConclusionsWe report evidence of bradyphrenia in HD that increases with disease progression. This processing deficit, which can be quantified using the CTiP, has the potential to greatly impact HD daily life and warrants additional research. • The CTiP assesses reaction times for sub-tests of increasing cognitive difficulty. • The CTiP allows for the motor-corrected assessment of cognitive processing. • Intra-individual sub-test differences increase with Huntington’s Disease (HD) stage. • These differences may distinguish HD disease stage or progression. • These findings suggest the presence of bradyphrenia in HD. Background: Bradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson’s disease and schizophrenia; however, little is known about this phenomenon in Huntington’s Disease (HD). Objective: The aim of this study was to investigate the presence of bradyphrenia in HD using the Computerized Test of Information Processing (CTiP), an easy to administer and objective task that assesses cognitive processing speed with increasing task complexity. Methods: This study included 211 participants: Huntington’s Disease Integrated Staging System (HD-ISS) Stage 0 [n = 28], Stage 1 [n = 30], Stage 2 [n = 48] and Stage 3 [n = 48], and healthy controls (HC) [n = 57]. The CTiP incorporates three subtests: Simple Reaction Time (SRT), which assesses baseline motor function; Choice Reaction Time (CRT), with an added decisional component; and Semantic Search Reaction Time (SSRT), with an added conceptual component. SRT scores were subtracted from CRT and SSRT scores to establish a motor-corrected measure of central conduction time, which was used to operationalize bradyphrenia. Results: HD-ISS and HC within-group reaction times differed significantly when comparing motor-corrected CRT vs SSRT (all ps < 0.0001). Furthermore, the magnitude of these differences increased with HD disease stage (p < 0.0001). An ROC analysis determined that motor-corrected within-subject differences significantly distinguished Stage 2 + 3 from Stage 0 + 1 (AUC = 0.72, p < 0.0001). Conclusions: We report evidence of bradyphrenia in HD that increases with disease progression. This processing deficit, which can be quantified using the CTiP, has the potential to greatly impact HD daily life and warrants additional research. •The CTiP assesses reaction times for sub-tests of increasing cognitive difficulty.•The CTiP allows for the motor-corrected assessment of cognitive processing.•Intra-individual sub-test differences increase with Huntington’s Disease (HD) stage.•These differences may distinguish HD disease stage or progression.•These findings suggest the presence of bradyphrenia in HD. Bradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson’s disease and schizophrenia; however, little is known about this phenomenon in Huntington’s Disease (HD). The aim of this study was to investigate the presence of bradyphrenia in HD using the Computerized Test of Information Processing (CTiP), an easy to administer and objective task that assesses cognitive processing speed with increasing task complexity. This study included 211 participants: Huntington’s Disease Integrated Staging System (HD-ISS) Stage 0 [n = 28], Stage 1 [n = 30], Stage 2 [n = 48] and Stage 3 [n = 48], and healthy controls (HC) [n = 57]. The CTiP incorporates three subtests: Simple Reaction Time (SRT), which assesses baseline motor function; Choice Reaction Time (CRT), with an added decisional component; and Semantic Search Reaction Time (SSRT), with an added conceptual component. SRT scores were subtracted from CRT and SSRT scores to establish a motor-corrected measure of central conduction time, which was used to operationalize bradyphrenia. HD-ISS and HC within-group reaction times differed significantly when comparing motor-corrected CRT vs SSRT (all ps < 0.0001). Furthermore, the magnitude of these differences increased with HD disease stage (p < 0.0001). An ROC analysis determined that motor-corrected within-subject differences significantly distinguished Stage 2 + 3 from Stage 0 + 1 (AUC = 0.72, p < 0.0001). We report evidence of bradyphrenia in HD that increases with disease progression. This processing deficit, which can be quantified using the CTiP, has the potential to greatly impact HD daily life and warrants additional research. |
ArticleNumber | 100243 |
Author | Parkin, Georgia M. Gilbert, Paul E. Corey-Bloom, Jody Churchill, Emma Culbert, Braden |
Author_xml | – sequence: 1 givenname: Georgia M. orcidid: 0000-0002-0588-2239 surname: Parkin fullname: Parkin, Georgia M. email: gparkin@health.ucsd.edu organization: Department of Neurosciences, University of California San Diego, San Diego 92093, CA, USA – sequence: 2 givenname: Braden surname: Culbert fullname: Culbert, Braden organization: Department of Neurosciences, University of California San Diego, San Diego 92093, CA, USA – sequence: 3 givenname: Emma surname: Churchill fullname: Churchill, Emma organization: Department of Neurosciences, University of California San Diego, San Diego 92093, CA, USA – sequence: 4 givenname: Paul E. surname: Gilbert fullname: Gilbert, Paul E. organization: Department of Psychology, San Diego State University, San Diego 92182, CA, USA – sequence: 5 givenname: Jody surname: Corey-Bloom fullname: Corey-Bloom, Jody organization: Department of Neurosciences, University of California San Diego, San Diego 92093, CA, USA |
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Cites_doi | 10.1016/j.jns.2011.08.003 10.1002/hbm.23866 10.1016/0920-9964(95)00069-0 10.1017/S0033291700009077 10.1002/bimj.200410135 10.1097/01.wnn.0000185278.21352.e5 10.1080/135468096396622 10.1002/mdc3.13121 10.1212/WNL.0000000000004743 10.1002/mds.26838 10.1006/brcg.1993.1007 10.1097/WNN.0b013e3181cc8bd4 10.1016/0028-3932(94)00071-9 10.7224/1537-2073-14.2.77 10.1016/S1474-4422(22)00120-X 10.1016/j.jns.2018.02.006 10.1001/archpsyc.1971.01750080083014 10.3233/JHD-220555 10.1016/j.nicl.2013.06.012 10.1016/j.acn.2007.04.008 10.1001/archneur.1984.04050190080019 10.1111/j.1532-5415.2005.53221.x 10.1016/j.acn.2006.06.013 |
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Keywords | Huntington’s disease Cognition Bradyphrenia Cognitive function Computerized testing |
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Snippet | •The CTiP assesses reaction times for sub-tests of increasing cognitive difficulty.•The CTiP allows for the motor-corrected assessment of cognitive... Bradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson's disease and... BackgroundBradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson's... • The CTiP assesses reaction times for sub-tests of increasing cognitive difficulty. • The CTiP allows for the motor-corrected assessment of cognitive... Background: Bradyphrenia, best thought of as the mental equivalent of bradykinesia, has been described in several disorders of the brain including Parkinson’s... |
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Title | Exploring bradyphrenia in Huntington’s disease using the computerized test of information processing (CTiP) |
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