scholarly journals Representational similarity scores of digits in the sensorimotor cortex are associated with behavioral performance

2021 ◽  
Author(s):  
Jolien Gooijers ◽  
Sima Chalavi ◽  
Alard Roebroeck ◽  
Amanda Kaas ◽  
Stephan Swinnen
Keyword(s):  
Reaction Time Task ◽  
Force Sensor ◽  
Sensor Data ◽  
Finger Tapping ◽  
Activation Patterns ◽  
Time Task ◽  
Somatotopic Organization ◽  
Right Hand ◽  
The Right ◽  
Similarity Scores

Previous studies aimed to unravel a digit-specific somatotopic organization in the primary sensorimotor (SM1) cortex. It is, however, yet to be determined whether such digit somatotopy is associated with motor performance (i.e., effector selection) and digit enslaving (unintentional co-contraction of fingers) during different types of motor tasks. Here, we adopted multivariate representational similarity analysis, applied to high-field (7T) MRI data, to explore digit activation patterns in response to online finger tapping. Sixteen young adults (7 males, mean age: 24.4 years) underwent MRI, and additionally performed an offline choice reaction time task (CRTT) to assess effector selection. During both the finger tapping task (FTT) and the CRTT, force sensor data of all digits were acquired. This allowed us to assess digit enslaving (obtained from CRTT & FTT), as well as digit interference (i.e., erroneous effector selection; obtained from CRTT) and correlate these variables with digit representational similarity scores of SM1. Digit enslaving during finger tapping was associated with contralateral SM1 representational similarity scores of both hands. During the reacton time task, digit enslaving of the right hand only was associated with representational similarity scores of left SM1. Additionally, right hand digit interference was associated with representational similarity scores of left S1. In conclusion, we demonstrate a cortical origin of digit enslaving, and uniquely reveal that effector selection performance is predicted by digit representations in the somatosensory cortex.

scholarly journals A Finger-Tapping Task and a Reaction Time Task as Behavioral Measures of the Transition From Wakefulness to Sleep: Which Task Interferes Less With the Sleep Onset Process?

SLEEP ◽  
1997 ◽  
Vol 20 (4) ◽  
pp. 301-312 ◽  
Author(s):  
Maria Casagrande ◽  
Luigi De Gennaro ◽  
Cristiano Violani ◽  
Paride Braibanti ◽  
Mario Bertini
Keyword(s):  
Reaction Time ◽  
Sleep Onset ◽  
Reaction Time Task ◽  
Finger Tapping ◽  
Behavioral Measures ◽  
Time Task

Laterality Differences for Speed but Not for Control in Sequential Finger Tapping

1988 ◽  
Vol 67 (3) ◽  
pp. 927-933 ◽  
Author(s):  
Linda Z. Podbros ◽  
Maria A. Wyke
Keyword(s):  
Motor Activity ◽  
Finger Tapping ◽  
Cerebral Function ◽  
Sequential Order ◽  
Left Hand ◽  
Right Hand ◽  
The Right ◽  
And Control ◽  
Normal Adults ◽  
Complex Movement

Multiple or sequential finger tapping is preferential to the dominant right hand with respect to speed. However, in more complex movement, variables other than speed become important. The present investigation uses a sequential finger-rapping task which permits assessment of between-hands differences with respect to rate and control of movement, with and without vision. 36 right-handed normal adults rapidly tapped their fingers in sequential order on a block (2.54 cm. sq.), trying not to move the block. Analyses of variance (mode × hand) performed for taps and shift of the block show the right hand to be faster than the left hand with and without vision, adding further to the notion that the left hemisphere predominates in increases in rapid movement and in sequencing aspects of motor activity. However, while both hands were steadier with vision than without, there were no between-hand differences with regard to control, suggesting equivalency of cerebral function for factors of manual sequencing other than speed.

Editorial Note

1946 ◽  
Vol 11 (1) ◽  
pp. 2-2
Keyword(s):  
Editorial Note ◽  
Speech Sounds ◽  
Left Hand ◽  
Hand Column ◽  
Right Hand ◽  
Infant Speech ◽  
The Right

In the article “Infant Speech Sounds and Intelligence” by Orvis C. Irwin and Han Piao Chen, in the December 1945 issue of the Journal, the paragraph which begins at the bottom of the left hand column on page 295 should have been placed immediately below the first paragraph at the top of the right hand column on page 296. To the authors we express our sincere apologies.

Eosinophilic vasculitis: an inhabitual and resistant manifestation of a vasculitis

VASA ◽  
2010 ◽  
Vol 39 (4) ◽  
pp. 344-348 ◽  
Author(s):  
Jandus ◽  
Bianda ◽  
Alerci ◽  
Gallino ◽  
Marone
Keyword(s):  
Skin Biopsy ◽  
Intravenous Iron ◽  
Small Vessel Vasculitis ◽  
High Dose ◽  
Raynaud Phenomenon ◽  
The Third ◽  
Left Elbow ◽  
Right Hand ◽  
The Right ◽  
Trunk Skin

A 55-year-old woman was referred because of diffuse pruritic erythematous lesions and an ischemic process of the third finger of her right hand. She was known to have anaemia secondary to hypermenorrhea. She presented six months before admission with a cutaneous infiltration on the left cubital cavity after a paravenous leakage of intravenous iron substitution. She then reported a progressive pruritic erythematous swelling of her left arm and lower extremities and trunk. Skin biopsy of a lesion on the right leg revealed a fibrillar, small-vessel vasculitis containing many eosinophils.Two months later she reported Raynaud symptoms in both hands, with a persistent violaceous coloration of the skin and cold sensation of her third digit of the right hand. A round 1.5 cm well-delimited swelling on the medial site of the left elbow was noted. The third digit of her right hand was cold and of violet colour. Eosinophilia (19 % of total leucocytes) was present. Doppler-duplex arterial examination of the upper extremities showed an occlusion of the cubital artery down to the palmar arcade on the right arm. Selective angiography of the right subclavian and brachial arteries showed diffuse alteration of the blood flow in the cubital artery and hand, with fine collateral circulation in the carpal region. Neither secondary causes of hypereosinophilia nor a myeloproliferative process was found. Considering the skin biopsy results and having excluded other causes of eosinophilia, we assumed the diagnosis of an eosinophilic vasculitis. Treatment with tacrolimus and high dose steroids was started, the latter tapered within 12 months and then stopped, but a dramatic flare-up of the vasculitis with Raynaud phenomenon occurred. A new immunosupressive approach with steroids and methotrexate was then introduced. This case of aggressive eosinophilic vasculitis is difficult to classify into the usual forms of vasculitis and constitutes a therapeutic challenge given the resistance to current immunosuppressive regimens.

Modeling Within-Person Variance in Reaction Time Data of Older Adults

GeroPsych ◽  
2011 ◽  
Vol 24 (4) ◽  
pp. 169-176 ◽  
Author(s):  
Philippe Rast ◽  
Daniel Zimprich
Keyword(s):  
Reaction Time ◽  
Cognitive Aging ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Reaction Time Data ◽  
Scale Model ◽  
Time Data ◽  
Time Task ◽  
The Mean ◽  
Second Wave

In order to model within-person (WP) variance in a reaction time task, we applied a mixed location scale model using 335 participants from the second wave of the Zurich Longitudinal Study on Cognitive Aging. The age of the respondents and the performance in another reaction time task were used to explain individual differences in the WP variance. To account for larger variances due to slower reaction times, we also used the average of the predicted individual reaction time (RT) as a predictor for the WP variability. Here, the WP variability was a function of the mean. At the same time, older participants were more variable and those with better performance in another RT task were more consistent in their responses.

Sign in / Sign up

Export Citation Format

Share Document