Interpolated Activity in Short-Term Motor Memory

1970 ◽  
Vol 30 (1) ◽  
pp. 231-234 ◽  
Author(s):  
George E. Stelmach ◽  
Julie L. Barber
Keyword(s):  
Memory Trace ◽  
Correlation Coefficients ◽  
Motor Memory ◽  
Short Term ◽  
Hands On ◽  
The Mean ◽  
Retention Intervals ◽  
Mean Differences ◽  
Kinesthetic Information ◽  
With Memory

Retention of kinesthetic information from blind positioning responses was examined for 56 Ss. During a 30-sec. retention interval, half of the Ss sat quietly with their hands on the lever; the other half learned an interpolated target which required an antagonistic response. Both conditions showed significant amounts of forgetting. The mean differences between conditions as well as the differences between correlation coefficients across retention intervals were not significant. The results were consistent with memory-trace decay predictions.

Effect of Instruction on Recall of Movements

1975 ◽  
Vol 41 (1) ◽  
pp. 119-124
Author(s):  
Jack Leavitt ◽  
Terry Ball
Keyword(s):  
Retention Interval ◽  
Factorial Design ◽  
Repeated Measures ◽  
Significant Interaction ◽  
Reverse Order ◽  
Motor Memory ◽  
Short Term ◽  
Information Input ◽  
Retention Intervals ◽  
Prior Item

A 4 × 4 factorial design with repeated measures across retention intervals and instructions was employed to determine the effect of instruction on recall ability of movement information from short-term motor memory. Each of the 16 Ss received all 16 possible treatment combinations. While both retention interval and instruction showed significant effects, there was no significant interaction. The reverse-order instruction was affected by the length of the retention interval while the no-prior-item, last-distance, and drop instructions were uninfluenced. No evidence supported the trace-decay hypothesis of forgetting. Ss seem easily able to remove information from memory or ignore information input so it is not represented in memory.

scholarly journals A study on harmonizing total ozone assimilation with multiple sensors

2018 ◽  
Author(s):  
Yves J. Rochon ◽  
Michael Sitwell ◽  
Young-Min Cho
Keyword(s):  
Bias Correction ◽  
Vertical Structure ◽  
Correlation Coefficients ◽  
Short Term ◽  
Total Column Ozone ◽  
Ozone Monitoring ◽  
Mean Differences ◽  
Column Ozone ◽  
The Impact ◽  
Total Column

Abstract. The impact of assimilating total column ozone datasets from single and multiple satellite data sources with and without bias correction has been examined with a version of the Environment and Climate Change Canada variational assimilation and forecasting system. The assimilated and evaluated data sources include the Global Ozone Monitoring Experiment-2 instruments on the MetOp-A and MetOp-B satellites (GOME-2A and GOME-2B), the total column ozone mapping instrument of the Ozone Mapping Profiler Suite (OMPS-NM) on the Suomi National Polar-orbiting Partnership (S-NPP) satellite, and the Ozone Monitoring Instrument (OMI) instrument on the Aura research satellite. Ground-based Brewer and Dobson spectrophotometers, and filter ozonometers, as well as the Solar Backscatter Ultraviolet satellite instrument (SBUV/2), served as independent validation sources for total column ozone. Regional and global mean differences of the OMI-TOMS data with measurements from the three ground-based instrument types for the three evaluated two month periods were found to be within 1 %, except for the polar regions with the largest differences from the comparatively small dataset in Antarctica exceeding 3 %. Values from SBUV/2 summed partial columns were typically larger than OMI-TOMS on average by 0.6 to 1.2 ± 0.7 %, with smaller differences than with ground-based over Antarctica. OMI-TOMS was chosen as the reference used in the bias correction instead of the ground-based observations due to OMI’s significantly better spatial and temporal coverage and interest in near-real time assimilation. Bias corrections as a function of latitude and solar zenith angle were performed with a two-week moving window using colocation with OMI-TOMS and three variants of differences with short-term forecasts. These approaches are shown to yield residual biases of less than 1 %, with the rare exceptions associated with bins with less data. These results were compared to a time-independent bias correction estimation that used colocations as a function of ozone effective temperature and solar zenith angle which, for the time period examined, resulted in larger changes in residual biases as a function of time for some cases. Assimilation experiments for the July-August 2014 period show a reduction of global and temporal mean biases for short-term forecasts relative to ground-based Brewer and Dobson data from a maximum of about 2.3 % in the absence of bias correction to less than 0.3 % in size when bias correction is included. Both temporally averaged and time varying mean differences of forecasts with OMI-TOMS are reduced to within 1 % for nearly all cases when bias corrected observations are assimilated for the latitudes where satellite data is present. The impact of bias correction on the standard deviations and anomaly correlation coefficients of forecast differences to OMI-TOMS is noticeable but small compared to the impact of introducing any total column ozone assimilation. The assimilation of total column ozone data can result in some improvement, as well as some deterioration, in the vertical structure of forecasts when comparing to Aura-MLS and ozonesonde profiles. The most significant improvement in the vertical domain from the assimilation of total column ozone alone is seen in the anomaly correlation coefficients in the tropical lower stratosphere, which increases from a minimum of 0.1 to about 0.6. Nonetheless, it is made evident that the quality of the vertical structure is most improved when also assimilating ozone profile data, which only weakly affects the total column short-term forecasts.

The Theoretical Relationship between Item Difficulty and The “In Doubt” Response in Music Tests

1979 ◽  
Vol 27 (3) ◽  
pp. 163-172
Author(s):  
Neil A. Levendusky
Keyword(s):  
Item Difficulty ◽  
Correlation Coefficients ◽  
Fourth Grade ◽  
Music Literacy ◽  
Theoretical Relationship ◽  
Musical Aptitude ◽  
Fourth Grade Students ◽  
The Mean ◽  
Mean Differences ◽  
The Relationship

The Musical Aptitude Profile (MAP) and the Iowa Tests of Music Literacy (ITML) were administered to 90 fourth-grade students to investigate the theoretical validity of the relationship between use of the “in doubt” response and item difficulty. The purpose of the study was to question Gordon's (the author of the test battery) theory that the use of the “in doubt” response increases as item difficulty increases. Statistically significant correlations between use of the “in doubt” response and item difficulty were found for all total tests of both batteries, the ITML Tonal subtest, Reading Recognition, and the MAP Tonal subtest, Harmony. No significant correlation coefficients were found for any of the Rhythm subtests. When the mean use of the “in doubt” response for items of extreme difficulty-very easy and very difficult—were compared, all mean differences were statistically significant except for the MAP Rhythm subtest, Meter, and the ITML Tonal subtest, Aural Perception.

scholarly journals Validation of a Human Pose Tracking Algorithm for Measuring Upper Limb Joints: Comparison With Photography-based Goniometry

2022 ◽  
Author(s):  
Qingtang Zhu ◽  
Jingyuan Fan ◽  
Fanbin Gu ◽  
Lulu Lv ◽  
Zhejin Zhang ◽  
...  
Keyword(s):  
Upper Limb ◽  
Digital Camera ◽  
Correlation Coefficients ◽  
Tracking Algorithm ◽  
Shoulder Abduction ◽  
Intra Class Correlation ◽  
Pose Tracking ◽  
Rgb Images ◽  
The Mean ◽  
Mean Differences

Abstract Background: Range of motion (ROM) measurements are essential for diagnosing and evaluating upper extremity conditions. Clinical goniometry is the most commonly used methods but it is time-consuming and skill-demanding. Recent advances in human tracking algorithm suggest potential for automatic angle measuring from RGB images. It provides an attractive alternative for at-distance measuring. However, the reliability of this method has not been fully established. The purpose of this study is to evaluate if the results of algorithm are as reliable as human raters in upper limb movements.Methods: Thirty healthy young adults (20 males, 10 females) participated in this study. Participants were asked to performed a 6-motion task including movement of shoulder, elbow and wrist. Images of movements were capture by commercial digital camera. Each movement was measured by a pose tracking algorithm and compared with the surgeon-measurement results. The mean differences between the two measurements were compared. Pearson correlation coefficients were used to determine the relationship. Reliability was investigated by the intra-class correlation coefficients.Results: Comparing this algorithm-based method with manual measurement, the mean differences were less than 3 degrees in 5 motions (shoulder abduction: 0.51; shoulder elevation: 2.87; elbow flexion:0.38; elbow extension:0.65; wrist extension: 0.78) except wrist flexion. All the intra-class correlation coefficients were larger than 0.60. The Pearson coefficients also showed high correlations between the two measurements (p<0.001). Conclusions: Our results indicated that pose estimation is a reliable method to measure the shoulder and elbow angles, supporting RGB images for measuring joint ROM. Our results proved the possibility that patients can assess their ROM by photos taken by a digital camera.Trial registration: This study was registered in the Clinical Trials Center of The First Affiliated Hospital, Sun Yat-sen University (2021-387).

scholarly journals Comparison of the Diet Photograph Record to Weighed Dietary Record and 24 h Dietary Recall for Estimating Energy and Nutrient Intakes Among Chinese Preschoolers

2021 ◽  
Vol 8 ◽  
Author(s):  
Yujie Xu ◽  
Ruonan Duan ◽  
Ping Feng ◽  
Wanke Gao ◽  
Dong Xing ◽  
...  
Keyword(s):  
Preschool Children ◽  
Dietary Intake ◽  
Southwest China ◽  
Correlation Coefficients ◽  
Nutrient Intakes ◽  
Relative Validity ◽  
Dietary Recall ◽  
Dietary Record ◽  
The Mean ◽  
Mean Differences

This study aimed to assess the relative validity of the diet photograph record (DP) for measuring the energy and nutrient intakes against the weighed dietary record (WD) and the 24 h dietary recall (HR) in the Chinese preschoolers. In this study, 40 preschool children aged 4–6 years and their parents were recruited from a kindergarten in southwest China. Dietary intake of the preschoolers on a same day, as estimated by the DP and the HR were compared with the WD. These three methods were administered by the three group of investigators independently. The mean differences, correlation coefficients, cross-classifications, and weighted κ, as well as the Bland–Altman plots were performed to assess the differences and agreements among the estimates from the DP, the HR, and the WD. For the DP and the HR, the estimates of energy and nutrient intakes were moderate to high correlated with the WD, with the higher coefficients ranging from 0.73 to 0.94 for the DP. Both the methods tended to underestimate the dietary intake, but the differences from the known weights using the DP were significantly smaller than those using the HR. The weighed κ values ranking the preschoolers ranged from 0.48 to 0.80 for the DP and ranged from 0.28 to 0.64 for the HR. Furthermore, the Bland–Altman plots indicated a better agreement between the DP and the WD for estimating energy and nutrient intakes. This DP is a valid tool for measuring energy and nutrient intakes among the preschoolers.

scholarly journals Can peripheral venous blood gases replace arterial blood gases in emergency department patients?

CJEM ◽  
2002 ◽  
Vol 4 (01) ◽  
pp. 7-15 ◽  
Author(s):  
Louise C.F. Rang ◽  
Heather E. Murray ◽  
George A. Wells ◽  
Cameron K. MacGougan
Keyword(s):  
Venous Blood ◽  
Correlation Coefficients ◽  
Blood Gases ◽  
Blood Gas ◽  
Emergency Physicians ◽  
Peripheral Venous Blood ◽  
Arterial Blood ◽  
The Mean ◽  
Mean Differences ◽  
Venous Blood Gas

ABSTRACTObjective:To determine if peripheral venous blood gas values for pH, partial pressure of carbon dioxide (PCO2) and the resultant calculated bicarbonate (HCO3) predict arterial values accurately enough to replace them in a clinical setting.Methods:This prospective observational study was performed in a university tertiary care emergency department from June to December 1998. Patients requiring arterial blood gas analysis were enrolled and underwent simultaneous venous blood gas sampling. The following data were prospectively recorded: age, sex, presenting complaint, vital signs, oxygen saturation, sample times, number of attempts and indication for testing. Correlation coefficients and mean differences with 95% confidence intervals (CIs) were calculated for pH,PCO2and HCO3. A survey of 45 academic emergency physicians was performed to determine the minimal clinically important difference for each variable.Results:The 218 subjects ranged in age from 15 to 90 (mean 60.4) years. The 2 blood samples were drawn within 10 minutes of each other for 205 (96%) of the 214 patients for whom data on timing were available. Pearson’s product–moment correlation coefficients between arterial and venous values were as follows: pH, 0.913;PCO2, 0.921; and HCO3, 0.953. The mean differences (and 95% CIs) between arterial and venous samples were as follows: pH, 0.036 (0.030–0.042);PCO2, 6.0 (5.0–7.0) mm Hg; and HCO3, 1.5 (1.3–1.7) mEq/L. The mean differences (± 2 standard deviations) were greater than the minimum clinically important differences identified in the survey.Conclusions:Arterial and venous blood gas samples were strongly correlated, and there were only small differences between them. A survey of emergency physicians suggested that the differences are too large to allow for interchangeability of results; however, venous values may be valid if used in conjunction with a correction factor or for trending purposes.

scholarly journals Comparison of central corneal thickness measurements with three different optical devices

2021 ◽  
Vol 13 ◽  
pp. 251584142199563
Author(s):  
Mehmet Barış Üçer ◽  
Erdinç Bozkurt
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Correlation Coefficients ◽  
Limits Of Agreement ◽  
The Mean ◽  
Mean Differences ◽  
High Level ◽  
Thickness Measurements

Purpose: The purpose of this study was to compare and evaluate the agreement of central corneal thickness (CCT) values obtained with three different devices working according to optical principle in healthy eyes. Methods: 60 eyes of 60 individuals (30 men and 30 women) were enrolled in this study. CCT measurements performed with Scheimpflug–Placido topographer (Sirius), spectral-domain optical coherence tomography (RTVue) with an anterior segment module, and optical biometer (AL-Scan) were compared. Bland–Altman analysis was used to demonstrate agreement between methods. Results: The mean age was 30.07 ± 7.313 years (range, 18–47 years). The mean CCT values obtained by RTVue, Sirius, and AL-Scan were 518.25 ± 36.38 µm, 526.08 ± 36.33 µm, and 513.50 ± 39.09 µm, respectively. The mean differences in CCT were 7.83 ± 14.15 µm between Sirius and RTVue, 12.58 ± 11.87 µm between Sirius and AL-Scan, and 4.75 ± 4.50 µm between RTVue and AL-Scan. The mean CCT was statistically different among the three groups ( p < 0.05). All three modalities of CCT measurements correlated closely with each other, with Pearson’s correlation coefficients ranging from 0.924 to 0.961. The 95% limits of agreement were −19.90 to 35.56 µm between Sirius and RTVue, −10.69 to 35.85 µm between Sirius and AL-Scan, and −4.07 to 13.58 µm between RTVue and AL-Scan. Conclusion: Different results could be obtained through different noncontact devices in CCT measurements. Although the measurement values obtained by these devices show a high level of correlation, it would be a more correct approach to not use them directly interchangeably in clinical practice. Evaluation and follow-up of CCT should be performed using the same device.

Overt Rehearsal in Short-Term Motor Memory

1982 ◽  
Vol 55 (1) ◽  
pp. 229-230 ◽  
Author(s):  
Greg Reid ◽  
Dan Q. Marisi
Keyword(s):  
Motor Memory ◽  
Short Term ◽  
Overt Rehearsal ◽  
Immediate Recall ◽  
Kinesthetic Information

Two experiments were conducted to examine the role of overt rehearsal of kinesthetic information on recall. In Exp. 1 preselected criterion movements were recalled with greater precision than constrained criterion movements but the benefits of overt rehearsal were negligible. In Exp. 2, 5 overt rehearsals improved replication of preselected movements (compared to 0 or 3) but rehearsal did not differ from immediate recall.

scholarly journals Implementation of a point-of-care ultrasound skills practicum for hospitalists

Ultrasound ◽  
2018 ◽  
Vol 27 (1) ◽  
pp. 38-44
Author(s):  
Emily Cochard ◽  
Zachary Fulkerson ◽  
W Graham Carlos
Keyword(s):  
Point Of Care ◽  
Ultrasound Image ◽  
Point Of Care Ultrasound ◽  
Short Term ◽  
Assessment Scores ◽  
Ultrasound Field ◽  
Hands On ◽  
Inpatient Medicine ◽  
The Mean

Introduction Point-of-care ultrasound is recognized as a safe and valuable diagnostic tool for patient evaluation. Hospitalists are prime candidates for advancing the point-of-care ultrasound field given their crucial role in inpatient medicine. Despite this, there is a notable lack of evidence-based ultrasound training for hospitalists. Most research focuses on diagnostic accuracy rather than the training required to achieve it. This study aims to improve hospitalists' point-of-care ultrasound knowledge and skills through a hands-on skills practicum. Methods Four skill practicums were conducted with pre-course, post-course, and six-month evaluations and knowledge assessments. Results The mean pre- vs. post-course knowledge assessment scores significantly improved, 41.7% vs. 75.9% (SD 16.1% and 12.7%, respectively, p < 0.0001). The mean ultrasound skills confidence ratings on a 10-point Likert scale significantly increased post-course (2.60 ± 1.66 vs. 6.33 ± 1.63, p < 0.0001), but decreased at six months (6.33 ± 1.63 vs. 4.10 ± 2.22, p < 0.0001). The greatest limitations to usage pre-course and at six months were knowledge/skills and lack of machine access. While knowledge/skills decreased from pre-course (82.0%) as compared to six-months (64.3%), lack of machine access increased from pre-course (15.8%) to six-months (28.6%) ( p = 0.28). Conclusion Hospitalists agree that point-of-care ultrasound has utility in the diagnostic and therapeutic management of patients, though the lack of training is a significant limitation. Our study demonstrated that a brief skills practicum significantly improves hospitalists’ confidence and knowledge regarding ultrasound image acquisition and interpretation in the short term. Long-term confidence and usage wanes, which appears to be due to the lack of machine access.

scholarly journals Comparison of Advanced Threshold and SITA Fast Perimetric Strategies

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Bartosz L. Sikorski ◽  
Adriana Laudencka
Keyword(s):  
Sensitivity And Specificity ◽  
Healthy Subjects ◽  
Correlation Coefficients ◽  
High Sensitivity ◽  
Test Duration ◽  
Receiver Operating Characteristic Curves ◽  
Global Indices ◽  
The Mean ◽  
Mean Differences ◽  
Very High

Purpose. To compare the results obtained with two threshold strategies of visual field assessment: Humphrey SITA Fast (SFA) (Carl Zeiss Meditec) and PTS 2000 Advanced Threshold (ADV) (Optopol Technology) in healthy subjects and patients with glaucoma. Methods. The study sample comprised of 53 healthy volunteers and 69 patients with glaucoma. One eye of each patient was examined with the SFA and ADV strategies. The quantitative comparisons of test duration and global indices were made using correlation coefficients. The sensitivity and specificity of the algorithms were evaluated based on the GHT results and the adjusted Anderson–Patella (A&P) criteria. Results. The ADV test duration was shorter both in healthy subjects (by 5%) and patients with glaucoma (by 18%). The mean differences in MS values between the SFA and the ADV strategies were 1.06 ± 1.13 dB (MSSFA-MSADV) in healthy subjects and 1.00 ± 1.92 dB (MSSFA-MSADV) in patients with glaucoma. The MD index of ADV tests was lower than the SFA in the healthy (−0.74 ± 1.09 dB) (MSSFA-MSADV) and glaucoma group (−0.85 ± 2.19 dB) (MSSFA-MSADV). The mean differences in PSD values determined using both methods were −0.86 ± 0.67 dB (PSDSFA-PSDADV) and −0.53 ± 1.48 dB (PSDSFA-PSDADV) in healthy subjects and patients with glaucoma, respectively. Analysis of receiver operating characteristic curves built from MD and PSD indices show bigger area under curve in SFA than in ADV (0.983 vs.0.968 and 0.986 vs. 0.938, respectively). The GHT-based sensitivity and specificity for the ADV strategy were 92.75% and 77.36%, respectively, as compared to 92.75% and 90.57%, respectively, for the SFA strategy. Conclusions. Both SFA and ADV enable effective identification of glaucomatous defects within 5 minutes. The ADV strategy, however, is significantly faster. The correlation between the global indices of SFA and ADV is very high. Both strategies offer very high sensitivity when using both GHT and A&P criteria.

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