scholarly journals CrossTalk opposing view: Peripheral and central chemoreceptors have hypoadditive effects on respiratory motor output

2013 ◽  
Vol 591 (18) ◽  
pp. 4355-4357 ◽  
Author(s):  
Richard J. A. Wilson ◽  
Trevor A. Day
Keyword(s):  
Motor Output ◽  
Opposing View ◽  
Central Chemoreceptors

Behavior in the Brain

2010 ◽  
Vol 24 (2) ◽  
pp. 76-82 ◽  
Author(s):  
Martin M. Monti ◽  
Adrian M. Owen
Keyword(s):  
Motor Behavior ◽  
Functional Neuroimaging ◽  
Brain Activity ◽  
Motor Output ◽  
The Unconscious ◽  
Ethical Implications ◽  
Brain Responses ◽  
Minimally Conscious ◽  
Brain Insults ◽  
Brain Behavior

Recent evidence has suggested that functional neuroimaging may play a crucial role in assessing residual cognition and awareness in brain injury survivors. In particular, brain insults that compromise the patient’s ability to produce motor output may render standard clinical testing ineffective. Indeed, if patients were aware but unable to signal so via motor behavior, they would be impossible to distinguish, at the bedside, from vegetative patients. Considering the alarming rate with which minimally conscious patients are misdiagnosed as vegetative, and the severe medical, legal, and ethical implications of such decisions, novel tools are urgently required to complement current clinical-assessment protocols. Functional neuroimaging may be particularly suited to this aim by providing a window on brain function without requiring patients to produce any motor output. Specifically, the possibility of detecting signs of willful behavior by directly observing brain activity (i.e., “brain behavior”), rather than motoric output, allows this approach to reach beyond what is observable at the bedside with standard clinical assessments. In addition, several neuroimaging studies have already highlighted neuroimaging protocols that can distinguish automatic brain responses from willful brain activity, making it possible to employ willful brain activations as an index of awareness. Certainly, neuroimaging in patient populations faces some theoretical and experimental difficulties, but willful, task-dependent, brain activation may be the only way to discriminate the conscious, but immobile, patient from the unconscious one.

The Philological Endeavours of the Early Arabic Linguists: Theological Implications of the tawqīf-iṣṭilāḥ Antithesis and the majāz Controversy – Part I

1999 ◽  
Vol 1 (1) ◽  
pp. 27-46 ◽  
Author(s):  
Mustafa Shah
Keyword(s):  
Opposing View ◽  
Religious Doctrine ◽  
Origin Of Language ◽  
The Way

This article examines a number of issues relating to discussions of the origin of language and related topics among early Arabic linguists. A number of these discussions treated the topic of the ‘revelationist’ view of language (tawqīf), and the opposing view that language had developed as a result of human convention (iṣṭilāḥ). It has been suggested that religious doctrine hampered the development of the linguistic tradition, as theologically motivated views increasingly governed the way in which linguists were able to articulate their positions on this and related subjects. We contend that the evidence does not altogether support this view, and that there was a subtle interplay between theological views and linguistic theories. Individual linguists, whom tradition identifies as having certain theological tendencies, are found to have followed lines of linguistic thinking at odds with what is assumed to have been the religious doctrine to which they subscribed. An increasingly sophisticated tradition of scholarship refined and reassessed arguments based on the Qur'an and earlier thought, with a concern for the theological implications of issues such as ishtiqāq, tarāduf and addād.

Essentially Evaluative?

2017 ◽  
Author(s):  
Simon Kirchin
Keyword(s):  
Opposing View ◽  
Thick Concepts

This chapter continues the account of thick concepts defended in Chapter Six by arguing that such concepts are essentially evaluative. This is opposed to the view that thick concepts are merely nonevaluative concepts that happen, every so often, to convey evaluation through linguistic and other contingent conventions. This opposing view has been best articulated by Pekka Väyrynen. This chapter presents and considers Väyrynen’s arguments for his claim, and the assumptions that lie behind both his own account of thin and thick concepts, and his overall view of evaluation. This chapter ventures that his arguments against nonseparationism do not work and that, in addition, his own position is suspect.

Frequency Modulation of Motor Unit Discharge Has Task-Dependent Effects on Fluctuations in Motor Output

2005 ◽  
Vol 94 (4) ◽  
pp. 2878-2887 ◽  
Author(s):  
Carol J. Mottram ◽  
Evangelos A. Christou ◽  
François G. Meyer ◽  
Roger M. Enoka
Keyword(s):  
Motor Unit ◽  
Frequency Modulation ◽  
Discharge Rate ◽  
Motor Output ◽  
Unit Discharge ◽  
Rate Of Increase ◽  
Output Force ◽  
Position Task ◽  
Motor Unit Discharge ◽  
Target Force

The rate of change in the fluctuations in motor output differs during the performance of fatiguing contractions that involve different types of loads. The purpose of this study was to examine the contribution of frequency modulation of motor unit discharge to the fluctuations in the motor output during sustained contractions with the force and position tasks. In separate tests with the upper arm vertical and the elbow flexed to 1.57 rad, the seated subjects maintained either a constant upward force at the wrist (force task) or a constant elbow angle (position task). The force and position tasks were performed in random order at a target force equal to 3.6 ± 2.1% (mean ± SD) of the maximal voluntary contraction (MVC) force above the recruitment threshold of an isolated motor unit from the biceps brachii. Each subject maintained the two tasks for an identical duration (161 ± 93 s) at a mean target force of 22.4 ± 13.6% MVC. As expected, the rate of increase in the fluctuations in motor output (force task: SD for detrended force; position task: SD for vertical acceleration) was greater for the position task than the force task ( P < 0.001). The amplitude of the coefficient of variation (CV) and the power spectra for motor unit discharge were similar between tasks ( P > 0.1) and did not change with time ( P > 0.1), and could not explain the different rates of increase in motor output fluctuations for the two tasks. Nonetheless, frequency modulation of motor unit discharge differed during the two tasks and predicted ( P < 0.001) both the CV for discharge rate (force task: 1–3, 12–13, and 14–15 Hz; position task: 0–1, and 1–2 Hz) and the fluctuations in motor output (force task: 5–6, 9–10, 12–13, and 14–15 Hz; position task: 6–7, 14–15, 17–19, 20–21, and 23–24 Hz). Frequency modulation of motor unit discharge rate differed for the force and position tasks and influenced the ability to sustain steady contractions.

scholarly journals ‘Pure’ Constructional Apraxia—A Cognitive Analysis of a Single Case

1998 ◽  
Vol 11 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Luigi Trojano ◽  
Dario Grossi
Keyword(s):  
Cognitive Impairment ◽  
Information Processing ◽  
Single Case ◽  
Cognitive Models ◽  
Motor Output ◽  
Cognitive Analysis ◽  
Cerebral Lesions ◽  
Recent Information ◽  
Geometric Figures ◽  
Constructional Apraxia

We report on a patient affected by selective drawing disabilities. The patient could correctly reproduce and draw simple geometric figures on request, but when he tried to reproduce more complex drawings or to draw common objects he performed very poorly. To identify the cognitive impairment in this patient, we adopted two test batteries based on recent information-processing models of drawing. Results showed that the patient’s drawing disabilities were independent of visuo-perceptual and executive impairments. These findings support recent cognitive models of drawing abilities: some intermediate stages of drawing exist at which information is processed to prepare and guide motor output, and which may be selectively disrupted after discrete cerebral lesions.

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