Preserved Adjustment but Impaired Awareness in a Sensory-Motor Conflict following Prefrontal Lesions

2001 ◽  
Vol 13 (3) ◽  
pp. 332-340 ◽  
Author(s):  
Andrea Slachevsky ◽  
Bernard Pillon ◽  
Pierre Fourneret ◽  
Pascale Pradat-Diehl ◽  
Marc Jeannerod ◽  
...  
Keyword(s):  
Prefrontal Cortex ◽  
Motor Program ◽  
Frontal Lobe Lesions ◽  
Graphic Tablet ◽  
Executive Process ◽  
Sensory Motor ◽  
Impaired Awareness ◽  
Ideal Line ◽  
The Right ◽  
The Ideal

Control of action occurs at different stagesof the executive process, in particular at those of sensory-motor integration and conscious monitoring. The aim of this study was to determine the implication of the prefrontal cortex in the control of action. For that purpose, we compared the performance of 15 patients with frontal lobe lesions and 15 matched controls on an experimental paradigm generating a conflict between the action planned and the sensory-motor feedback. Subjects had to trace a sagittal line witha stylus on a graphic tablet. The hand was hidden by a mirror on which the traced line, processed by a computer, was projected. Without informing the subjects, the line traced was modified by introducing a bias to the right, which increased progressively from 2° to 42°. To succeed the task, subjects had to modify their motor program and deviate their hand in the opposite direction. The sensory-motor adjustment to the bias was evaluated by the surface between the line traced and the ideal line to compensate for the deviation. The awareness of the conflict was measured by the angle of the bias at which subjects expressed the feeling that the line they traced was not the same as the line they saw. The deviation was similarly compensated for by patients and controls until24°. Then 14 controls but only3 patients were aware of a conflict. After that, the variability of performance increased significantly for the unaware patients. These results suggest that the prefrontal cortex is required at the level of conscious monitoring of actions, but not at the level of sensory-motor integration.

scholarly journals Task-dependent vocal adjustments to optimize biosonar-based information acquisition

2020 ◽  
Author(s):  
Daniel Lewanzik ◽  
Holger R. Goerlitz
Keyword(s):  
Information Acquisition ◽  
Motor Program ◽  
Peak Frequency ◽  
Sufficient Information ◽  
Dependent Manner ◽  
Adaptive Sensing ◽  
Sensory Motor ◽  
Information Update ◽  
Echolocation Signal ◽  
The Right

AbstractAnimals need to acquire adequate and sufficient information to guide movements, yet information acquisition and processing is costly. Animals thus face a trade-off between gathering too little and too much information and, accordingly, actively adapt sensory input through motor control. Echolocating animals provide the unique opportunity to study the dynamics of adaptive sensing in naturally behaving animals, since every change in the outgoing echolocation signal directly affects information acquisition and the perception of the dynamic acoustic scene. Here we investigated the flexibility with which bats dynamically adapt information acquisition depending on a task. We recorded the echolocation signals of wild-caught Western barbastelle bats (Barbastella barbastellus) while flying through an opening, drinking on the wing, landing on a wall, and capturing prey. We show that the echolocation signal sequences during target approach differed in a task-dependent manner; bats started target approach earlier and increased information update rate more when the task became increasingly difficult, and bats also adjusted dynamics of call duration shortening and peak frequency shifts accordingly. These task-specific differences existed from the onset of object approach, implying that bats plan their sensory-motor program for object approach exclusively based on information received from search call echoes. We provide insights into how echolocating animals deal with the constraints they face when sequentially sampling the world through sound by adjusting acoustic information flow from slow to extremely fast in a highly dynamic manner. Our results further highlight the paramount importance of high behavioural flexibility for acquiring information.Summary statementHaving the right information for a specific job is crucial. Echolocating bats flexibly and independently adjust different call parameters to match the sensory-motor challenges of four different tasks.

Why Choose Cardiothoracic Surgery as a Career?

2011 ◽  
Vol 14 (3) ◽  
pp. 142 ◽  
Author(s):  
Raja R. Gopaldas ◽  
Faisal G. Bakaeen ◽  
Danny Chu ◽  
Joseph S. Coselli ◽  
Denton A. Cooley
Keyword(s):  
Technological Progress ◽  
Artery Bypass ◽  
Cardiothoracic Surgery ◽  
Faculty Members ◽  
New Graduates ◽  
The Future ◽  
Cardiac Surgeon ◽  
The Right ◽  
Cardiac Surgeons ◽  
The Ideal

The future of cardiothoracic surgery faces a lofty challenge with the advancement of percutaneous technology and minimally invasive approaches. Coronary artery bypass grafting (CABG) surgery, once a lucrative operation and the driving force of our specialty, faces challenges with competitive stenting and poor reimbursements, contributing to a drop in applicants to our specialty that is further fueled by the negative information that members of other specialties impart to trainees. In the current era of explosive technological progress, the great diversity of our field should be viewed as a source of excitement, rather than confusion, for the upcoming generation. The ideal future cardiac surgeon must be a "surgeon-innovator," a reincarnation of the pioneering cardiac surgeons of the "golden age" of medicine. Equipped with the right skills, new graduates will land high-quality jobs that will help them to mature and excel. Mentorship is a key component at all stages of cardiothoracic training and career development. We review the main challenges facing our specialty�length of training, long hours, financial hardship, and uncertainty about the future, mentorship, and jobs�and we present individual perspectives from both residents and faculty members.

When the State Speaks, What Should It Say?

2012 ◽  
Author(s):  
Corey Brettschneider
Keyword(s):  
Freedom Of Expression ◽  
The State ◽  
Hate Groups ◽  
New Approach ◽  
State Action ◽  
Democratic State ◽  
Theory Of Value ◽  
The Right ◽  
Equal Citizenship ◽  
The Ideal

How should a liberal democracy respond to hate groups and others that oppose the ideal of free and equal citizenship? The democratic state faces the hard choice of either protecting the rights of hate groups and allowing their views to spread, or banning their views and violating citizens' rights to freedoms of expression, association, and religion. Avoiding the familiar yet problematic responses to these issues, this book proposes a new approach called value democracy. The theory of value democracy argues that the state should protect the right to express illiberal beliefs, but the state should also engage in democratic persuasion when it speaks through its various expressive capacities: publicly criticizing, and giving reasons to reject, hate-based or other discriminatory viewpoints. Distinguishing between two kinds of state action—expressive and coercive—the book contends that public criticism of viewpoints advocating discrimination based on race, gender, or sexual orientation should be pursued through the state's expressive capacities as speaker, educator, and spender. When the state uses its expressive capacities to promote the values of free and equal citizenship, it engages in democratic persuasion. By using democratic persuasion, the state can both respect rights and counter hateful or discriminatory viewpoints. The book extends this analysis from freedom of expression to the freedoms of religion and association, and shows that value democracy can uphold the protection of these freedoms while promoting equality for all citizens.

FREE EXPRESSION OR EQUAL SPEECH?

2020 ◽  
Vol 37 (2) ◽  
pp. 153-169
Author(s):  
Teresa M. Bejan
Keyword(s):  
Freedom Of Expression ◽  
Free Expression ◽  
Freedom Of Association ◽  
Classical Liberal ◽  
Freedom Of Thought ◽  
The Right ◽  
Equal Right ◽  
To Receive ◽  
The Ideal

AbstractThe classical liberal doctrine of free expression asserts the priority of speech as an extension of the freedom of thought. Yet its critics argue that freedom of expression, itself, demands the suppression of the so-called “silencing speech” of racists, sexists, and so on, as a threat to the equal expressive rights of others. This essay argues that the claim to free expression must be distinguished from claims to equal speech. The former asserts an equal right to express one’s thoughts without interference; the latter the right to address others, and to receive a hearing and consideration from them, in turn. I explore the theory of equal speech in light of the ancient Athenian practice of isegoria and argue that the equality demanded is not distributive but relational: an equal speaker’s voice should be counted as “on a par” with others. This ideal better captures critics’ concerns about silencing speech than do their appeals to free expression. Insofar as epistemic and status-harms provide grounds for the suppression and exclusion of some speech and speakers, the ideal of equal speech is more closely connected with the freedom of association than of thought. Noticing this draws attention to the continuing—and potentially problematic—importance of exclusion in constituting effective sites of equal speech today.

scholarly journals Null Effect of Transcranial Static Magnetic Field Stimulation over the Dorsolateral Prefrontal Cortex on Behavioral Performance in a Go/NoGo Task

2021 ◽  
Vol 11 (4) ◽  
pp. 483
Author(s):  
Tatsunori Watanabe ◽  
Nami Kubo ◽  
Xiaoxiao Chen ◽  
Keisuke Yunoki ◽  
Takuya Matsumoto ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Prefrontal Cortex ◽  
Inhibitory Control ◽  
Static Magnetic Field ◽  
Dorsolateral Prefrontal Cortex ◽  
Cortical Excitability ◽  
Control Function ◽  
Field Stimulation ◽  
Dorsolateral Prefrontal ◽  
The Right

The purpose of this pilot study was to investigate whether transcranial static magnetic field stimulation (tSMS), which can modulate cortical excitability, would influence inhibitory control function when applied over the dorsolateral prefrontal cortex (DLPFC). Young healthy adults (n = 8, mean age ± SD = 24.4 ± 4.1, six females) received the following stimulations for 30 min on different days: (1) tSMS over the left DLPFC, (2) tSMS over the right DLPFC, and (3) sham stimulation over either the left or right DLPFC. The participants performed a Go/NoGo task before, immediately after, and 10 min after the stimulation. They were instructed to extend the right wrist in response to target stimuli. We recorded the electromyogram from the right wrist extensor muscles and analyzed erroneous responses (false alarm and missed target detection) and reaction times. As a result, 50% of the participants made erroneous responses, and there were five erroneous responses in total (0.003%). A series of statistical analyses revealed that tSMS did not affect the reaction time. These preliminary findings suggest the possibility that tSMS over the DLPFC is incapable of modulating inhibitory control and/or that the cognitive load imposed in this study was insufficient to detect the effect.

Unemployment in the Affective Economy: Exploring the Affective Governing of Young Unemployed People in the Danish Welfare State

2020 ◽  
Vol 66 (3) ◽  
pp. 335-361
Author(s):  
Sabina Pultz
Keyword(s):  
Welfare State ◽  
Complex Relationship ◽  
Field Observations ◽  
Unemployed People ◽  
Political Implications ◽  
Governmentality Studies ◽  
The Right ◽  
The Unemployed ◽  
The Ideal

Abstract This case study investigates the affective governing of young unemployed people, and it concludes that getting money in the Danish welfare state comes with an “affective price”. In the quest for a job, unemployed people have been increasingly responsibilized in order to live up to the ideal of the active jobseeker. Consequently, when faced with unemployment, they are encouraged to work harder on themselves and their motivation. Based on an interview study with young unemployed people (N=39) and field observations made at employment fund agencies in Denmark (2014–15), I explore how young unemployed people are governed by and through their emotions. By supplementing governmentality studies (Foucault et al. 1988, 2010) with the concept of “affective economy” from Ahmed (2014), I discuss how young unemployed people who receive money from the Danish state are placed in a situation of debt. The paper unfolds how this debt becomes visible as the unemployed people often describe feeling under suspicion for not doing enough, for not being motivated enough. Through an abundance of (pro) activity, they have to prove the suspicion of being lazy wrong, and through managing themselves as active jobseekers, they earn the right to get money from the state. Here motivation, passion and empowerment are key currencies. I discuss the intricate interplay between monetary and affective currencies as well as political implications in the context of the Danish welfare. The article contributes by making visible the importance of taking affective matters into account when investigating the complex relationship between politics and psychology.

scholarly journals Single-Pulse Transcranial Magnetic Stimulation-Evoked Potential Amplitudes and Latencies in the Motor and Dorsolateral Prefrontal Cortex among Young, Older Healthy Participants, and Schizophrenia Patients

2021 ◽  
Vol 11 (1) ◽  
pp. 54
Author(s):  
Yoshihiro Noda ◽  
Mera S. Barr ◽  
Reza Zomorrodi ◽  
Robin F. H. Cash ◽  
Pantelis Lioumis ◽  
...  
Keyword(s):  
Prefrontal Cortex ◽  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Dorsolateral Prefrontal Cortex ◽  
Evoked Potential ◽  
Single Pulse ◽  
Signal Propagation ◽  
Lower Amplitude ◽  
Dorsolateral Prefrontal ◽  
The Right

Background: The combination of transcranial magnetic stimulation (TMS) with electroencephalography (EEG) allows for non-invasive investigation of cortical response and connectivity in human cortex. This study aimed to examine the amplitudes and latencies of each TMS-evoked potential (TEP) component induced by single-pulse TMS (spTMS) to the left motor (M1) and dorsolateral prefrontal cortex (DLPFC) among healthy young participants (YNG), older participants (OLD), and patients with schizophrenia (SCZ). Methods: We compared the spatiotemporal characteristics of TEPs induced by spTMS among the groups. Results: Compared to YNG, M1-spTMS induced lower amplitudes of N45 and P180 in OLD and a lower amplitude of P180 in SCZ, whereas the DLPFC-spTMS induced a lower N45 in OLD. Further, OLD demonstrated latency delays in P60 after M1-spTMS and in N45-P60 over the right central region after left DLPFC-spTMS, whereas SCZ demonstrated latency delays in N45-P60 over the midline and right central regions after DLPFC-spTMS. Conclusions: These findings suggest that inhibitory and excitatory mechanisms mediating TEPs may be altered in OLD and SCZ. The amplitude and latency changes of TEPs with spTMS may reflect underlying neurophysiological changes in OLD and SCZ, respectively. The spTMS administered to M1 and the DLPFC can probe cortical functions by examining TEPs. Thus, TMS-EEG can be used to study changes in cortical connectivity and signal propagation from healthy to pathological brains.

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