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https://www.readbyqxmd.com/read/28731839/cost-benefit-arbitration-between-multiple-reinforcement-learning-systems
#1
Wouter Kool, Samuel J Gershman, Fiery A Cushman
Human behavior is sometimes determined by habit and other times by goal-directed planning. Modern reinforcement-learning theories formalize this distinction as a competition between a computationally cheap but inaccurate model-free system that gives rise to habits and a computationally expensive but accurate model-based system that implements planning. It is unclear, however, how people choose to allocate control between these systems. Here, we propose that arbitration occurs by comparing each system's task-specific costs and benefits...
July 1, 2017: Psychological Science
https://www.readbyqxmd.com/read/28729647/neural-determinants-of-human-goal-directed-vs-habitual-action-control-and-their-relation-to-trait-motivation
#2
Hamdi Eryilmaz, Anais Rodriguez-Thompson, Alexandra S Tanner, Madeline Giegold, Franklin C Huntington, Joshua L Roffman
Instrumental learning is mediated by goal-directed and habit systems in the brain. While rodent studies implicate distinct prefrontal/striatal regions in goal-directed and habit learning, neural systems underpinning these two processes in humans remain poorly understood. Here, using a validated discrimination learning task that distinguishes goal-directed learning from habit learning in 72 subjects in fMRI, we investigated the corticostriatal correlates of goal-directed learning and tested whether brain activation during learning is associated with trait motivation and behavioral performance in the post-learning test phase...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728198/-nutrition-of-polymorbid-patients-data-or-opinions
#3
Mathias Plauth
Polymorbidity and old age are rather the rule than the exception in hospitalised patients. Malnutrition is common in such patients and should be identified by appropriate screening and assessment measures in order to devise a nutrition plan and act accordingly. Unlike in the UK or The Netherlands, malnutrition screening and nutrition teams are not mandatory for German hospitals. Malnutrition and, in particular, sarcopenia are indicators of a nutrition associated risk or increased morbidity and mortality. Malnutrition can affect patients of any medical discipline and, therefore, is managed most efficiently by the interdisciplinary and multiprofessional nutrition team...
July 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28723943/stress-enhances-model-free-reinforcement-learning-only-after-negative-outcome
#4
Heyeon Park, Daeyeol Lee, Jeanyung Chey
Previous studies found that stress shifts behavioral control by promoting habits while decreasing goal-directed behaviors during reward-based decision-making. It is, however, unclear how stress disrupts the relative contribution of the two systems controlling reward-seeking behavior, i.e. model-free (or habit) and model-based (or goal-directed). Here, we investigated whether stress biases the contribution of model-free and model-based reinforcement learning processes differently depending on the valence of outcome, and whether stress alters the learning rate, i...
2017: PloS One
https://www.readbyqxmd.com/read/28719661/minimizing-endpoint-variability-through-reinforcement-learning-during-reaching-movements-involving-shoulder-elbow-and-wrist
#5
David Marc Anton Mehler, Alexandra Reichenbach, Julius Klein, Jörn Diedrichsen
Reaching movements are comprised of the coordinated action across multiple joints. The human skeleton is redundant for this task because different joint configurations can lead to the same endpoint in space. How do people learn to use combinations of joints that maximize success in goal-directed motor tasks? To answer this question, we used a 3-degree-of-freedom manipulandum to measure shoulder, elbow and wrist joint movements during reaching in a plane. We tested whether a shift in the relative contribution of the wrist and elbow joints to a reaching movement could be learned by an implicit reinforcement regime...
2017: PloS One
https://www.readbyqxmd.com/read/28718175/deployment-of-spatial-attention-to-a-structural-framework-exogenous-alerting-and-endogenous-goal-directed-factors
#6
Lisa N Jefferies, Vincent Di Lollo
The main question examined in the present work was whether spatial attention can be deployed to an appropriate structural framework not only endogenously when the framework is displayed continuously, as in previous work, but also exogenously, when it is displayed transiently 100 ms before the target. The results of five experiments answered that question in the negative. We found that the onset transient triggered by a brief presentation of the structural framework did enhance the response to the upcoming target...
July 17, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28716611/predictability-of-action-sub-steps-modulates-motor-system-activation-during-the-observation-of-goal-directed-actions
#7
Ricarda Braukmann, Harold Bekkering, Margreeth Hidding, Edita Poljac, Jan K Buitelaar, Sabine Hunnius
Action perception and execution are linked in the human motor system, and researchers have proposed that this action-observation matching system underlies our ability to predict observed behavior. If the motor system is indeed involved in the generation of action predictions, activation should be modulated by the degree of predictability of an observed action. This study used EEG and eye-tracking to investigate whether and how predictability of an observed action modulates motor system activation as well as behavioral predictions in the form of anticipatory eye-movements...
July 14, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28715828/pooled-rcts-early-goal-directed-therapy-does-not-reduce-mortality-more-than-usual-care-in-early-septic-shock
#8
Brian M Fuller, Christopher R Carpenter
No abstract text is available yet for this article.
July 18, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28714162/occupational-performance-coaching-client-centered-and-goal-directed-practice-a-commentary-on-collaborations-with-sylvia-rodger
#9
Fiona Graham
No abstract text is available yet for this article.
July 2017: Australian Occupational Therapy Journal
https://www.readbyqxmd.com/read/28714075/working-memory-and-organizational-skills-problems-in-adhd
#10
Michael J Kofler, Dustin E Sarver, Sherelle L Harmon, Allison Moltisanti, Paula A Aduen, Elia F Soto, Nicole Ferretti
BACKGROUND: This study tested model-driven predictions regarding working memory's role in the organizational problems associated with ADHD. METHOD: Children aged 8-13 (M = 10.33, SD = 1.42) with and without ADHD (N = 103; 39 girls; 73% Caucasian/Non-Hispanic) were assessed on multiple, counterbalanced working memory tasks. Parents and teachers completed norm-referenced measures of organizational problems (Children's Organizational Skills Scale; COSS). RESULTS: Results confirmed large magnitude working memory deficits (d = 1...
July 17, 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28713304/eye-behavior-associated-with-internally-versus-externally-directed-cognition
#11
Mathias Benedek, Robert Stoiser, Sonja Walcher, Christof Körner
What do our eyes do when we are focused on internal representations such as during imagination or planning? Evidence from mind wandering research suggests that spontaneous shifts from externally directed cognition (EDC) to internally directed cognition (IDC) involves oculomotor changes indicative of visual disengagement. In the present study, we investigated potential differences in eye behavior between goal-directed forms of IDC and EDC. To this end, we manipulated the focus of attention (internal versus external) in two demanding cognitive tasks (anagram and sentence generation)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28712609/is-early-goal-directed-therapy-or-standard-therapy-more-effective-in-decreasing-mortality-among-patients-with-sepsis
#12
EDITORIAL
Melinda J Morton Hamer, Sara K Faught
No abstract text is available yet for this article.
July 13, 2017: Annals of Emergency Medicine
https://www.readbyqxmd.com/read/28711111/to-do-or-not-to-do-task-control-deficit-in-obsessive-compulsive-disorder
#13
Eyal Kalanthroff, Avishai Henik, Helen Blair Simpson, Doron Todder, Gideon E Anholt
Task control is an executive control mechanism that facilitates goal-directed task selection by suppressing irrelevant automatic "stimulus-driven" behaviors. In the current study, we test the hypothesis that less efficient task control in individuals diagnosed with obsessive-compulsive disorder (OCD) is associated with OCD symptoms, and specifically, with the inability to inhibit unwanted behaviors in OCD. Thirty-five healthy controls, 30 participants with OCD, and 26 participants with generalized anxiety disorder (GAD) completed the object-interference (OI) task to measure task control, the stop-signal task to measure response inhibition, and the arrow-flanker task to evaluate executive abilities not contingent upon task control...
September 2017: Behavior Therapy
https://www.readbyqxmd.com/read/28709478/erratum-to-fluid-therapy-recommendations-for-major-abdominal-surgery-via-rica-recommendations-revisited-part-iii-goal-directed-hemodynamic-therapy-rationale-for-maintaining-vascular-tone-and-contractility-rev-esp-anestesiol-reanim-2017-64-6-348-359
#14
J Ripollés-Melchor, D Chappell, H D Aya, Á Espinosa, M G Mythen, A Abad-Gurumeta, S D Bergese, R Casans-Francés, J M Calvo-Vecino
No abstract text is available yet for this article.
August 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/28709477/erratum-to-fluid-therapy-recommendations-for-major-abdominal-surgery-via-rica-recommendations-revisited-part-ii-goal-directed-hemodynamic-therapy-rationale-for-optimising-intravascular-volume-rev-esp-anestesiol-reanim-2017-64-6-339-347
#15
J Ripollés-Melchor, D Chappell, H D Aya, Á Espinosa, M G Mythen, A Abad-Gurumeta, S D Bergese, R Casans-Francés, J M Calvo-Vecino
No abstract text is available yet for this article.
August 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/28708676/is-early-goal-directed-therapy-harmful-to-patients-with-sepsis-and-high-disease-severity
#16
Andre C Kalil, John A Kellum
No abstract text is available yet for this article.
August 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28708547/multimodal-fusion-with-reference-searching-for-joint-neuromarkers-of-working-memory-deficits-in-schizophrenia
#17
Shile Qi, Vince D Calhoun, Theo G M van Erp, Juan Bustillo, Eswar Damaraju, Jessica A Turner, Yuhui Du, Jian Yang, Jiayu Chen, Qingbao Yu, Daniel H Mathalon, Judith M Ford, James Voyvodic, Bryon A Mueller, Aysenil Belger, Sarah McEwen, Steven G Potkin, Adrian Preda, Tianzi Jiang, Jing Sui
By exploiting cross-information among multiple imaging data, multimodal fusion has often been used to better understand brain diseases. However, most current fusion approaches are blind, without adopting any prior information. There is increasing interest to uncover the neurocognitive mapping of specific clinical measurements on enriched brain imaging data; hence, a supervised, goal-directed model that employs prior information as a reference to guide multimodal data fusion is much needed and becomes a natural option...
July 11, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28707521/increased-risk-of-attempted-suicide-in-australian-veterans-is-associated-with-total-and-permanent-incapacitation-unemployment-and-posttraumatic-stress-disorder-severity
#18
Katelyn Kerr, Madeline Romaniuk, Sarah McLeay, Andrew Khoo, Michael T Dent, Mark Boshen
BACKGROUND: Military veterans have higher rates of suicidality and completed suicides compared to the general population. Previous research has demonstrated suicidal behaviour is higher in US combat veterans who are younger, suffer from posttraumatic stress disorder, depression and anxiety and score lower on measures of health. However, research on predictors of suicide for Australian veterans is limited. The aim of this study was to identify significant demographic and psychological differences between veterans with posttraumatic stress disorder who had attempted suicide and those with posttraumatic stress disorder who had not, as well as determine predictors of suicide attempts within an Australian cohort...
July 1, 2017: Australian and New Zealand Journal of Psychiatry
https://www.readbyqxmd.com/read/28707389/methamphetamine-promotes-habitual-action-and-alters-the-density-of-striatal-glutamate-receptor-and-vesicular-proteins-in-dorsal-striatum
#19
Teri M Furlong, Laura H Corbit, Robert A Brown, Bernard W Balleine
Goal-directed actions are controlled by the value of the consequences they produce and so increase when what they produce is valuable and decrease when it is not. With continued invariant practice, however, goal-directed actions can become habits, controlled not by their consequences but by antecedent, reward-related states and stimuli. Here, we show that pre-exposure to methamphetamine (METH) caused abnormally rapid development of habitual control. Furthermore, these drug-induced habits differed strikingly from conventional habits; we found that they were insensitive both to changes in reward value and to the effects of negative feedback...
July 14, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28704632/measuring-memory-and-attention-to-preview-in-motion
#20
Richard J Jagacinski, Gordon M Hammond, Emanuele Rizzi
Objective Use perceptual-motor responses to perturbations to reveal the spatio-temporal detail of memory for the recent past and attention to preview when participants track a winding roadway. Background Memory of the recently passed roadway can be inferred from feedback control models of the participants' manual movement patterns. Similarly, attention to preview of the upcoming roadway can be inferred from feedforward control models of manual movement patterns. Method Perturbation techniques were used to measure these memory and attention functions...
August 2017: Human Factors
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