Patterns of Perceptual-Motor Dysfunction in Children: A Factor Analytic Study

1965 ◽  
Vol 20 (2) ◽  
pp. 335-368 ◽  
Author(s):  
A. Jean Ayres
Keyword(s):  
Motor Planning ◽  
Tactile Perception ◽  
The Body ◽  
Motor Dysfunction ◽  
Defensive Responses ◽  
Tactile Defensiveness ◽  
Factor Analytic Study ◽  
Tactile Stimuli ◽  
Developmental Apraxia ◽  
Two Sides

Analysis of test scores made by 100 children with and 50 without suspected perceptual deficits lead to hypothesizing five syndromes characteristic of dysfunction: (a) developmental apraxia, distinguished by deficits in motor planning, tactile perception and finger identification; (b) tactile, kinesthetic and visual perceptual dysfunction in form and position in space; (c) tactile defensiveness, demonstrated by hyperactive-distractible behavior, faulty tactile perception and defensive responses to tactile stimuli; (d) deficit of integration of the two sides of the body, identified by difficulty in right-left discrimination, avoidance in crossing the mid-line, and incoordinate bilateral hand movements; (e) deficit of visual figure-ground discrimination.

Evaluation of Body Sway Using Tactile Stimuli on the Body Trunk

2016 ◽  
Vol 136 (8) ◽  
pp. 1135-1141
Author(s):  
Ryo Hasegawa ◽  
Amir Maleki ◽  
Masafumi Uchida
Keyword(s):  
The Body ◽  
Body Sway ◽  
Tactile Stimuli

Rattlesnake strike behavior: kinematics

1998 ◽  
Vol 201 (6) ◽  
pp. 837-850 ◽  
Author(s):  
K V Kardong ◽  
V L Bels
Keyword(s):  
High Speed ◽  
Predatory Behavior ◽  
The Body ◽  
Body Postures ◽  
Body Segments ◽  
Impact Forces ◽  
Tactile Stimuli ◽  
High Speed Film ◽  
Rodent Prey ◽  
Subsequent Loss

The predatory behavior of rattlesnakes includes many distinctive preparatory phases leading to an extremely rapid strike, during which venom is injected. The rodent prey is then rapidly released, removing the snake's head from retaliation by the prey. The quick action of the venom makes possible the recovery of the dispatched prey during the ensuing poststrike period. The strike is usually completed in less than 0.5 s, placing a premium on an accurate strike that produces no significant errors in fang placement that could result in poor envenomation and subsequent loss of the prey. To clarify the basis for effective strike performance, we examined the basic kinematics of the rapid strike using high-speed film analysis. We scored numerous strike variables. Four major results were obtained. (1) Neurosensory control of the strike is based primarily upon sensory inputs via the eyes and facial pits to launch the strike, and upon tactile stimuli after contact. Correction for errors in targeting occurs not by a change in strike trajectory, but by fang repositioning after the jaws have made contact with the prey. (2) The rattlesnake strike is based upon great versatility and variation in recruitment of body segments and body postures. (3) Forces generated during acceleration of the head are transferred to posterior body sections to decelerate the head before contact with the prey, thereby reducing impact forces upon the snake's jaws. (4) Body acceleration is based on two patterns of body displacement, one in which acute sections of the body open like a gate, the other in which body segments flow around postural curves similar to movements seen during locomotion. There is one major implication of these results: recruitment of body segments, launch postures and kinematic features of the strike may be quite varied from strike to strike, but the overall predatory success of each strike by a rattlesnake is very consistent. <P>

The locust jump. I. The motor programme

1977 ◽  
Vol 66 (1) ◽  
pp. 203-219
Author(s):  
W. J. Heitler ◽  
M. Burrows
Keyword(s):  
High Frequency ◽  
Tactile Stimulation ◽  
The Body ◽  
Flexor Muscle ◽  
Tactile Stimuli ◽  
Extensor Muscles ◽  
Trigger Activity ◽  
Three Stages ◽  
Motor Programme ◽  
Made In

A motor programme is described for defensive kicking in the locust which is also probably the programme for jumping. The method of analysis has been to make intracellular recordings from the somata of identified motornuerones which control the metathoracic tibiae while defensive kicks are made in response to tactile stimuli. Three stages are recognized in the programme. (1) Initial flexion of the tibiae results from the low spike threshold of tibial flexor motorneurones to tactile stimulation of the body. (2) Co-contraction of flexor and extensor muscles followa in which flexor and extensor excitor motoneurones spike at high frequency for 300-600 ms. the tibia flexed while the extensor muscle develops tension isometrically to the level required for a kick or jump. (3) Trigger activity terminates the co-contraction by inhibiting the flexor excitor motorneurones and simultaneously exciting the flexor inhibitors. This causes relaxation of the flexor muscle and allows the tibiae to extend. If the trigger activity does not occur, the jump or kick is aborted, and the tibiae remain flexed.

scholarly journals Visual body size adaptation and estimation of tactile distance

2020 ◽  
Author(s):  
Regine Zopf ◽  
Veronika Kosourikhina ◽  
Kevin R. Brooks ◽  
Vince Polito ◽  
Ian Stephen
Keyword(s):  
Body Size ◽  
Adaptation Effect ◽  
The Body ◽  
Size Perception ◽  
Visual Adaptation ◽  
Social Environments ◽  
Body Images ◽  
Tactile Stimuli ◽  
Before And After ◽  
Adaptation Effects

Estimating the size of bodies is crucial for interactions with physical and social environments. Body size perception is malleable and can be altered using visual adaptation paradigms. However, it is unclear whether such visual adaptation effects also transfer to other modalities and influence, for example, the perception of tactile distances. In this study we employed a visual adaptation paradigm. Participants were exposed to images of expanded or contracted versions of self- or other-identity bodies. Before and after this adaptation they were asked to manipulate the width of body images to appear as “normal” as possible. We replicated an effect of visual adaptation, such that the body size selected as most “normal” was larger after exposure to expanded and thinner after exposure to contracted adaptation stimuli. In contrast, we did not find evidence that this adaptation effect transfers to distance estimates for paired tactile stimuli delivered to the abdomen. A Bayesian analysis showed that our data provide moderate evidence that there is no effect of visual body size adaptation on the estimation of spatial parameters in a tactile task. This suggests that visual body size adaptation effects do not transfer to somatosensory body size representations.

scholarly journals The Chaetotaxy of the Pupa of Stegomyia fasciata

1920 ◽  
Vol 10 (2) ◽  
pp. 161-169 ◽  
Author(s):  
J. W. S. Macfie
Keyword(s):  
The Body ◽  
Posterior Angle ◽  
Image Position ◽  
The Right ◽  
Two Sides

The pupa is bilaterally symmetrical, that is, setae occur in similar situations on each side of the body, so that it will suffice to describe the arrangement on one side only. The setae on the two sides of the same pupa, however, often vary as regards their sub-divisions, and similar variations occur between different individuals; as an example, in Table I are shown some of the variations that were found in ten pupae taken at random. An examination of a larger number would have revealed a wider range. As a rule, a seta which is sometimes single, sometimes divided, is longer when single. For example, in one pupa the seta at the posterior angle ofthe seventh segment was single on the right side, double on the left; the former measuring 266μ, and the latter only 159μ in length. This fact is not specifically mentioned in the descriptions which follow, but should be understood.

Alternating Hemiplegia of Childhood, neurological comorbidities, intrafamilial variability: case-reports and literature review.

2021 ◽  
Author(s):  
Piero Pavone ◽  
Xena Giada Pappalardo ◽  
Naira Mustafa ◽  
Sung Yoon Cho ◽  
Dong Kyu Jin ◽  
...  
Keyword(s):  
Literature Review ◽  
Developmental Delay ◽  
Age Of Onset ◽  
Case Reports ◽  
Epileptic Seizures ◽  
The Body ◽  
Motor Dysfunction ◽  
Missense Mutations ◽  
Alternating Hemiplegia Of Childhood ◽  
Novel Variant

Abstract BACKGROUND Alternating Hemiplegia of Childhood (AHC) is an uncommon and complex disorder characterized by age of onset before 18 months, recurrent hemiplegia of one or either sides of the body or quadriplegia. Neurological comorbidities observed in two couples of AHC affected children are here reported together with data drawn by literature review. Results of genetic analysis obtained in the probands are also discussed. Developmental delay, epilepsy, tonic or dystonic spells, nystagmus and autonomic manifestations are frequently reported. AHC is mainly caused by mutations in ATP1A3 gene, and to a lesser extent in ATP1A2 gene.CASE PRESENTATION Clinical and genetic findings of a couple of twins and a couple of siblings affected by AHC from two different Italian families were deeply examined. Intrafamilial clinical variability was shown in the present cases. A pathogenic variant rs606231437 in ATP1A3 gene was detected in twins. For the affected siblings of family 2, the genetic results showed that the older brother and the healthy father shared a novel variant of GRIN2A (c.3175T>A) gene, and two missense mutations in SCNIB (rs150721582) and KCNQ2 (rs771211103) genes. In the younger brother was found only the GRIN2A variant.CONCLUSIONS Developmental delay, epileptic seizures and motor dysfunction are features frequently associated to paroxysmal hemiplegic attacks. Hemiplegic episode is only a sign even if the most remarkable of several neurological comorbidities in AHC carriers. The comparison of molecular analysis among the four probands brings out how the genetic framework is not recurrent, but may result from an unexpected greater genetic heterogeneity.

The Effect of Labyrinthectomy on the Co-ordination of Limb Movements in the Toad

1947 ◽  
Vol 24 (1-2) ◽  
pp. 36-41
Author(s):  
J. GRAY ◽  
H. W. LISSMANN
Keyword(s):  
Normal Animal ◽  
The Body ◽  
Limb Movements ◽  
Membranous Labyrinth ◽  
Freely Suspended ◽  
Two Sides

1. After bilateral labyrinthectomy, a toad can only walk normally if the stimulus which excites it to move is applied symmetrically on the two sides of the body. If the stimulus is asymmetrical, the animal's path curves towards the unstimulated side; if the stimulus is relatively intense the animal ‘circles’ persistently towards the unstimulated side. The ambulatory response of a normal animal to an asymmetrical stimulus is dependent on both proprioceptive and labyrinthine activity. 2. After bilateral labyrinthectomy, both hindlimbs exhibit swimming movements when the animal is freely suspended in water but co-ordination between the two limbs is lost. Evidence is put forward which suggests that the swimming rhythm of the limbs may be dependent on rhythmical excitation of the membranous labyrinth. No swimming occurs when the limbs of a labyrinthectomized toad are de-afferentated. 3. The removal of both labyrinths does not abolish the power of the limbs to right the animal when placed on its back. The mechanics of the righting movement are described.

scholarly journals Peripersonal Space and Bodily Self-Consciousness: Implications for Psychological Trauma-Related Disorders

2020 ◽  
Vol 14 ◽  
Author(s):  
Daniela Rabellino ◽  
Paul A. Frewen ◽  
Margaret C. McKinnon ◽  
Ruth A. Lanius
Keyword(s):  
Multisensory Processing ◽  
Premotor Cortex ◽  
Critical Role ◽  
Psychological Trauma ◽  
Peripersonal Space ◽  
The Body ◽  
Future Research ◽  
Altered States ◽  
Tactile Stimuli ◽  
Defensive Role

Peripersonal space (PPS) is defined as the space surrounding the body where we can reach or be reached by external entities, including objects or other individuals. PPS is an essential component of bodily self-consciousness that allows us to perform actions in the world (e.g., grasping and manipulating objects) and protect our body while interacting with the surrounding environment. Multisensory processing plays a critical role in PPS representation, facilitating not only to situate ourselves in space but also assisting in the localization of external entities at a close distance from our bodies. Such abilities appear especially crucial when an external entity (a sound, an object, or a person) is approaching us, thereby allowing the assessment of the salience of a potential incoming threat. Accordingly, PPS represents a key aspect of social cognitive processes operational when we interact with other people (for example, in a dynamic dyad). The underpinnings of PPS have been investigated largely in human models and in animals and include the operation of dedicated multimodal neurons (neurons that respond specifically to co-occurring stimuli from different perceptive modalities, e.g., auditory and tactile stimuli) within brain regions involved in sensorimotor processing (ventral intraparietal sulcus, ventral premotor cortex), interoception (insula), and visual recognition (lateral occipital cortex). Although the defensive role of the PPS has been observed in psychopathology (e.g., in phobias) the relation between PPS and altered states of bodily consciousness remains largely unexplored. Specifically, PPS representation in trauma-related disorders, where altered states of consciousness can involve dissociation from the body and its surroundings, have not been investigated. Accordingly, we review here: (1) the behavioral and neurobiological literature surrounding trauma-related disorders and its relevance to PPS; and (2) outline future research directions aimed at examining altered states of bodily self-consciousness in trauma related-disorders.

Effects of cerebellar lesions and stimulation on the shivering tremor

1965 ◽  
Vol 209 (6) ◽  
pp. 1261-1266 ◽  
Author(s):  
Douglas Stuart ◽  
Kenneth Ott ◽  
Earl Eldred
Keyword(s):  
Anterior Lobe ◽  
Repetitive Stimulation ◽  
The Body ◽  
Fastigial Nucleus ◽  
Regulatory Effect ◽  
Normal Pattern ◽  
Single Shock ◽  
Cerebellar Lesions ◽  
Two Sides ◽  
Stimulation Of

Shivering responses to cold have been studied in 21 cats subjected to lesions or stimulation of the cerebellum. Reluctance gauges taped to the extremity were used to sense accelerations produced by the tremor. Shivering of normal pattern was recorded within hours after total extirpation of the cerebellum and up to 4 weeks after surgery. Cats with lesions restricted to the anterior lobe also demonstrated apparently normal rhythm shivering. Comparison of regularity, amplitude, and rate of limb tremor in cats with a hemicerebellectomy, or lesions of one dentate, interpositus, or fastigial nucleus failed to reveal significant differences between the two sides of the body. Single shock or repetitive stimulation of medial cerebellar sites through indwelling electrodes primarily caused suppression of the amplitude of an ongoing tremor, but only at thresholds well above those needed to cause clonic or tonic movements of the limb. It is concluded that the presence of the cerebellum is not requisite for initiation and maintenance of shivering and that this organ has little regulatory effect on the rhythmicity of shivering.

scholarly journals Non-informative vision improves spatial tactile discrimination on the shoulder but does not influence detection sensitivity

2020 ◽  
Vol 238 (12) ◽  
pp. 2865-2875
Author(s):  
Fabrizio Leo ◽  
Sara Nataletti ◽  
Luca Brayda
Keyword(s):  
Tactile Stimulation ◽  
Detection Threshold ◽  
Receptive Fields ◽  
Judgment Task ◽  
The Body ◽  
Detection Sensitivity ◽  
Body Parts ◽  
Tactile Acuity ◽  
Tactile Stimuli ◽  
Numerosity Judgment

Abstract Vision of the body has been reported to improve tactile acuity even when vision is not informative about the actual tactile stimulation. However, it is currently unclear whether this effect is limited to body parts such as hand, forearm or foot that can be normally viewed, or it also generalizes to body locations, such as the shoulder, that are rarely before our own eyes. In this study, subjects consecutively performed a detection threshold task and a numerosity judgment task of tactile stimuli on the shoulder. Meanwhile, they watched either a real-time video showing their shoulder or simply a fixation cross as control condition. We show that non-informative vision improves tactile numerosity judgment which might involve tactile acuity, but not tactile sensitivity. Furthermore, the improvement in tactile accuracy modulated by vision seems to be due to an enhanced ability in discriminating the number of adjacent active electrodes. These results are consistent with the view that bimodal visuotactile neurons sharp tactile receptive fields in an early somatosensory map, probably via top-down modulation of lateral inhibition.

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