scholarly journals Task-level value affects trial-level reward processing and control

2021 ◽  
Author(s):  
Cameron D Hassall ◽  
Clay B Holroyd
Keyword(s):  
Reward Processing ◽  
Task Value ◽  
Anterior Cingulate ◽  
Average Value ◽  
Reward Positivity ◽  
Current Task ◽  
Frontal Midline Theta ◽  
And Control ◽  
Level Variable ◽  
Task Level

Despite disagreement about how anterior cingulate cortex (ACC) supports decision making, a recent hypothesis suggests that activity in this region is best understood in the context of a task or series of tasks. One important task-level variable is average reward because it is both a known driver of effortful behaviour and an important determiner of the tasks in which we choose to engage. Here we asked how average task value affects reward-related ACC activity. To answer this question, we measured a reward-related signal said to be generated in ACC called the reward positivity (RewP) while participants gambled in three tasks of differing average value. The RewP was reduced in the high-value task, an effect that was not explainable by either reward magnitude or outcome expectancy. Average task value also affected cue-locked frontal midline theta (FMT), an ACC signal linked to cognitive control: FMT was enhanced for low-value cues relative to high-value cues. This effect was related to behaviour, as the more FMT a participant exhibited, the better they performed. These results suggest that ACC does not evaluate outcomes and cues in isolation, but in the context of the value of the current task.

scholarly journals Electrophysiological indices of anterior cingulate cortex function reveal changing levels of cognitive effort and reward valuation that sustain task performance

2017 ◽  
Author(s):  
Akina Umemoto ◽  
Michael Inzlicht ◽  
Clay B. Holroyd
Keyword(s):  
Anterior Cingulate Cortex ◽  
Task Performance ◽  
Cingulate Cortex ◽  
Cognitive Effort ◽  
Reward Processing ◽  
Anterior Cingulate ◽  
Time On Task ◽  
Frontal Midline Theta ◽  
High Control ◽  
Reward Valuation

AbstractSuccessful execution of goal-directed behaviors often requires the deployment of cognitive control, which is thought to require cognitive effort. Recent theories have proposed that anterior cingulate cortex (ACC) regulates control levels by weighing the reward-related benefits of control against its effort-related costs. However, given that the sensations of cognitive effort and reward valuation are available only to introspection, this hypothesis is difficult to investigate empirically. We have proposed that two electrophysiological indices of ACC function, frontal midline theta and the reward positivity (RewP), provide objective measures of these functions. To investigate this issue, we recorded the electroencephalogram (EEG) from participants engaged in an extended, cognitively-demanding task. Participants performed a time estimation task for 2 hours in which they received reward and error feedback according to their task performance. We observed that the amplitude of the RewP, a feedback-locked component of the event related brain potential associated with reward processing, decreased with time-on-task. Conversely, frontal midline theta power, which consists of 4-8 Hz EEG oscillations associated with cognitive effort, increased with time-on-task. We also examined how these phenomena changed over time by conducting within-participant multi-level modeling analyses. Our results suggest that extended execution of a cognitively-demanding task is characterized by an early phase in which high control levels combine with strong reward valuation to foster rapid improvements in task performance, and a later phase in which high control levels counteract waning reward valuation to maintain stable task performance.

scholarly journals Cannabinoids, reward processing, and psychosis

2021 ◽  
Author(s):  
Brandon Gunasekera ◽  
Kelly Diederen ◽  
Sagnik Bhattacharyya
Keyword(s):  
Psychotic Disorders ◽  
Neural Substrates ◽  
Brain Regions ◽  
Reward Processing ◽  
Anterior Cingulate ◽  
Psychotic Symptoms ◽  
Dopamine Synthesis ◽  
Future Research ◽  
Drug Challenge ◽  
Psychotomimetic Effects

Abstract Background Evidence suggests that an overlap exists between the neurobiology of psychotic disorders and the effects of cannabinoids on neurocognitive and neurochemical substrates involved in reward processing. Aims We investigate whether the psychotomimetic effects of delta-9-tetrahydrocannabinol (THC) and the antipsychotic potential of cannabidiol (CBD) are underpinned by their effects on the reward system and dopamine. Methods This narrative review focuses on the overlap between altered dopamine signalling and reward processing induced by cannabinoids, pre-clinically and in humans. A systematic search was conducted of acute cannabinoid drug-challenge studies using neuroimaging in healthy subjects and those with psychosis Results There is evidence of increased striatal presynaptic dopamine synthesis and release in psychosis, as well as abnormal engagement of the striatum during reward processing. Although, acute THC challenges have elicited a modest effect on striatal dopamine, cannabis users generally indicate impaired presynaptic dopaminergic function. Functional MRI studies have identified that a single dose of THC may modulate regions involved in reward and salience processing such as the striatum, midbrain, insular, and anterior cingulate, with some effects correlating with the severity of THC-induced psychotic symptoms. CBD may modulate brain regions involved in reward/salience processing in an opposite direction to that of THC. Conclusions There is evidence to suggest modulation of reward processing and its neural substrates by THC and CBD. Whether such effects underlie the psychotomimetic/antipsychotic effects of these cannabinoids remains unclear. Future research should address these unanswered questions to understand the relationship between endocannabinoid dysfunction, reward processing abnormalities, and psychosis.

PENGARUH EDUKASI PERAWAT TERHADAP KETEPATAN KELUARGA PASIEN MELAKUKAN CUCI TANGAN DALAM PENCEGAHAN PENULARAN COVID-19 DI RSUD ARIFIN ACHMAD PROVINSI RIAU

2021 ◽  
Vol 3 (4) ◽  
pp. 70-74
Author(s):  
Nurul Utami
Keyword(s):  
Quantitative Research ◽  
Public Awareness ◽  
Nurse Education ◽  
Hand Washing ◽  
P Value ◽  
Average Value ◽  
High Incidence ◽  
Quasi Experimental ◽  
And Control ◽  
Source Of Information

Corona virus is a virus that attacks the respiratory system. The high incidence of Covid-19 is due to low public awareness of applying health protocols. So the need for prevention and control efforts by complying with health protocols to wear masks, keep your distance and wash your hands properly. Washing hands is an easy routine and is important in infection control, and is the best method to prevent the transmission of microorganisms. The purpose of this study was to determine the effect of nurse education on the accuracy of the patient's family through hand washing in preventing Covid-19 transmission at Arifin Achmad Hospital, Riau Province. This research uses quantitative research with a quasi experimental design, with a population of 20 people. Data collection tools used observation sheets and data analysis was carried out univariate and bivariate with the Wilcoxson test. The results of this study show that the average value before being given education about hand washing is low compared to the average value after being given education about hand washing. So that hand washing education is effective in increasing hand washing to prevent Covid-19 transmission with a p-value of 0.000. The results of this study are expected to be a source of information and knowledge for the nursing profession regarding the effect of providing nurse education on the accuracy of the patient's family in washing hands.

scholarly journals Penggunaan Musik Daerah Untuk Meningkatkan Kompetensi Kecepatan Dan Ketepatan Mengetik Mahasiswa

2017 ◽  
Vol 2 (3) ◽  
pp. 12
Author(s):  
Maya Setiawardani ◽  
Tintin Suhaeni
Keyword(s):  
Instrumental Music ◽  
Traditional Music ◽  
Individual Performance ◽  
Control Group ◽  
Treatment Groups ◽  
Average Value ◽  
Typing Skills ◽  
Regional Music ◽  
Almost All ◽  
And Control

Mastery of keyboarding being part urgent to communicate through the computer, and very important, especially students who study in the field of business. On the other side, individual performance also influenced by the work environment, and music is one form the environment that could effect keyboarding performance. A model that can describe this is the stimulus-responsible model of mehrabian-russell which explains that music can affect the performance of individual writing. Almost all of Indonesia has traditional music. Therefore, research is needed to identify the effects of traditional music to enrich the area of innovation in strategies and techniques of learning keyboarding skills. In this study conducted an experiment on two groups, the treatment groups(traditional music) and control group (without traditional) and questionnaire to strengthen the experimental results. In preliminary tests of typing, both groups had a mean AWPM identical or similar. Furthermore, tests carried one, where the treatment group listened to five kinds of music Java, Sunda, and Bali. The test result and the result of the questionnaire showed that (typing skills shown by the average value of AWPM) will increase significantly used of traditional music as the background. So, the genre of traditional music can be stimulant to improve average performance of AWPM. There are three traditional kinds of music that can improve student typing speed and accuracy significantly, a regional music cublek-cublek suweng, kebiar bali, and oleg tambuliningan, but cublek-cublek suweng is a genre of traditional music that has the best effect. Therefore, the process of learning courses keyboarding skills needs to use instrumental traditional music, especially instrumental music that has a fast and cheerfully tempo.

scholarly journals Sensory perception in autism: an fMRI ALE meta-analysis

2020 ◽  
Author(s):  
Nazia Jassim ◽  
Simon Baron-Cohen ◽  
John Suckling
Keyword(s):  
Meta Analysis ◽  
Likelihood Estimation ◽  
Sensory Perception ◽  
Superior Temporal Gyrus ◽  
Occipital Cortex ◽  
Anterior Cingulate ◽  
Future Research ◽  
Precentral Gyrus ◽  
And Control ◽  
Lateral Occipital Cortex

Sensory sensitivities occur in up to 90% of autistic individuals. With the recent inclusion of sensory symptoms in the diagnostic criteria for autism, there is a current need to develop neural hypotheses related to autistic sensory perception. Using activation likelihood estimation (ALE), we meta-analysed 52 task-based fMRI studies investigating differences between autistic (n=891) and control (n=967) participants during non-social sensory perception. During complex perception, autistic groups showed more activity in the secondary somatosensory and occipital cortices, insula, caudate, superior temporal gyrus, and inferior parietal lobule, while control groups showed more activity in the frontal and parietal regions. During basic sensory processing, autistic groups showed hyperactivity in the lateral occipital cortex, primary somatosensory and motor cortices, insula, caudate, and thalamus, while controls showed heightened activity in the precentral gyrus, middle frontal gyrus, precuneus, and anterior cingulate cortex. We conclude that autistic individuals, on average, show distinct engagement of sensory-related brain networks during sensory perception. These findings may help guide future research to focus on relevant neurobiological mechanisms underpinning the autistic experience.

scholarly journals EFEKTIFITAS PEMBELAJARAN MATEMATIKA MODEL LEARNING CYCLE 5E BERBANTUAN CD INTERAKTIF MATERI SEGITIGA KELAS VII DI SMPN 2 LIMPUNG KABUPATEN BATANG

2012 ◽  
Vol 4 (1) ◽  
pp. 207
Author(s):  
Lilik Ariyanto ◽  
Muhammad Prayito
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Test Sample ◽  
Student Learning Outcomes ◽  
Field Trials ◽  
Learning Cycle ◽  
Model Learning ◽  
Summary Table ◽  
Average Value ◽  
And Control

This study has the objective to determine the effectiveness of mathematic learning with Learning Cycle 5e model using interactive CD of triangle in class VII N 2 Limpung, Batang . This type of research is experimental research. Variables used in this study were: (1) student learning outcomes, obtained with the test, (2) creativity of student learning obtained from observations. The results of field trials demonstrated experimentally achieve effective classroom learning include, (1) study completed by the Z = -1.48 classical individually and with one test sample value sig (2-tailed) is 0.016, (2) creativity affects the outcome learning seen from the R square in Model Summary table obtained 0.660 = 66%., and (3) there is a difference between a class to learn the results of experimental and control classes with values ​​in the table Independent sig Test Samples of 0.029 = 2.9%, the average value the average grade of 70.57 experimental and control classes for 60.93 it can be concluded that the experimental class learning better learning outcomes compared to the control class.

scholarly journals PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE GI (GROUP INVESTIGATION) TERHADAP KETERAMPILAN GENERIK SAINS SISWA

2015 ◽  
Vol 3 (2) ◽  
pp. 297
Author(s):  
Sari’ah Sari’ah ◽  
Saiful Prayogi ◽  
Sukainil Ahzan
Keyword(s):  
Data Analysis ◽  
Cooperative Learning ◽  
Random Sampling ◽  
Learning Model ◽  
T Test ◽  
Generic Skills ◽  
Average Value ◽  
Analysis Technique ◽  
Quasi Experimental ◽  
And Control

The purpose of this study was to determine the effect of cooperative learning model of group investigation type against scince generic skills of students. This research was a quasi-experimental. The population in the study was a grade VIII MTS Nurul Falah NW Lajut with 36 students. Sampling was derived by random sampling where the 16 students of VIII A as on experimental class and VIII B as a control class with 20 students.Based on pretest data analysis, obtained an average value of 31,25 experimental class and control class was 42,2.Posttest analysis showed an average grade of 65,75 experimental and control class was 61,6.  The data analysis technique was t-test. It show t- test= 5,80 and t-table = 1,67. Because of  t-count is greater than the  t- table, it can be concluded that there were the effect of cooperative learning model of group investigation generic against science skills of student.

Evaluation of the Compound Topographic Index (CTI) for the location of gullies in cultivated areas of Córdoba (Spain)

2021 ◽  
Author(s):  
Eduardo Luquin ◽  
Yolanda Zuasti ◽  
Jorge Delgado ◽  
Raquel Gastesi ◽  
Javier Casalí ◽  
...  
Keyword(s):  
Goodness Of Fit ◽  
Confusion Matrix ◽  
Qualitative Evaluation ◽  
Evaluation Tool ◽  
Software Environment ◽  
Topographic Index ◽  
Average Value ◽  
Olive Groves ◽  
Compound Topographic Index ◽  
And Control

<p>The identification of areas susceptible to gully formation is an objective that has important consequences for erosion control. It allows for the optimization of resources by focusing on prevention and control efforts on the most susceptible areas, avoiding the frequent evolution of ephemeral to permanent gullies. The issue is of great interest in Spanish olive groves, many of which are affected by serious problems of gully erosion.</p><p>Gullies are formed in the swales, which allows the use of topography-based tools to predict their location.</p><p>The Compound Topographic Index (CTI) proposed by Thorne et al. (1986) is calculated for each pixel as an estimate of the flow capacity to cause erosion, as it includes the product of the pixel draining area and its slope. Its application requires the identification of a critical value of the CTI (CTIc), above which the potential areas of gully occurrence will be located. Using historical orthophotos, the gullies observed were digitized for 2011 in the experimental areas called Morente (11 km<sup>2</sup> of traditional olive groves on degraded and poor vertisols) and Matasanos (6 km<sup>2</sup> of intensive olive groves also on vertisols) and nearby area, with cereal crops.</p><p>The objectives of this work are: to identify CTIc values corresponding to cultivated areas in Cordoba, mainly olive groves; to develop and evaluate an application that allows a user without great technical skills to obtain the CTI; to evaluate the capacity of this CTIc to reproduce gullies observed in nearby areas or in different time periods (2005) to establish cause-effect relationships between changes in landuse in this type of phenomenon, using the aforementioned tool.</p><p>Part of the digitized gullies, representative of olive grove areas, were used to obtain the CTIc of each gully, by modifying it until the best reproduction of the gullies observed was achieved, then their average value was taken as CTIc. To calculate the CTI, a 5m resolution DEM was used, obtained from LiDAR PNOA 2014.</p><p>In the framework of the Innolivar project, a desktop GIS application has been developed in a free software environment such as QGIS, which allows the calculation of the CTI. The APET tool (AGNPS Potential Ephemeral Gully Evaluation Tool) recently implemented has helped in the development of this application.</p><p>The CTI calculation by the application, after the determination of the CTIc threshold, serves to identify critical areas from a DEM, which is free and available in many countries. A first qualitative evaluation by visual verification indicates a very good characterization of the gullies. Subsequently, the goodness of fit of the gully position between the digitized gullies and the app-calculated gullies according to the CTIc is evaluated quantitatively by obtaining a binary confusion matrix by lengths. In the Morente area, an error of omission of 29% and of commission of 16% was obtained.</p><p>It can be concluded that the application generated that allows the application of the CTI methodology makes identification of areas susceptible to gully formation possible in an efficient and relatively simple manner, helping to achieve a more sustainable agriculture.</p>

Orbitofrontal cortex output pathways: cingulate cortex, basal ganglia, and dopamine

2019 ◽  
pp. 145-164
Author(s):  
Edmund T. Rolls
Keyword(s):  
Orbitofrontal Cortex ◽  
Instrumental Learning ◽  
Cingulate Cortex ◽  
Reward Processing ◽  
Dopamine Neurons ◽  
Anterior Cingulate ◽  
Stimulus Response ◽  
Related Information ◽  
Outcome Information ◽  
Reward Information

The medial orbitofrontal cortex projects reward-related information to the pregenual cingulate cortex, and the lateral orbitofrontal cortex projects punishment and non-reward information to the supracallosal anterior cingulate cortex. These projections provide the reward outcome information needed for action-outcome goal value dependent instrumental learning by the cingulate cortex. The orbitofrontal cortex also projects reward-related information to the striatum for stimulus-response habit learning. Via the striatal route, and further in part via the habenula, the orbitofrontal cortex provides information about rewards and non-rewards that reached the brainstem dopamine neurons, some of which respond to positive reward prediction error, and the serotonin (5HT) neurons. The orbitofrontal cortex is therefore perhaps the key brain region involved in reward processing in the brain. The orbitofrontal cortex also has projections that can influence autonomic function, in part via the insula.

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