Abstract：
:The present study tested the idea that the visuomotor systems mediating prehension do not have independent access to pictorial cues processed by perceptual mechanisms. Individuals with visual form agnosia, whose perceptual systems are compromised but who have intact visuomotor control, were examined to determine whether they could use pictorial scene cues to calibrate manual prehension when binocular information was removed. The removal of binocular cues produced considerable disruptions in size-constancy of grip aperture, which, combined with earlier observations in normal subjects, suggests that binocular cues are of primary importance in calibration of grasping. In the absence of binocular vision, normal subjects can use pictorial information, information that is severely compromised in individuals with visual form agnosia, to compute the distance (and thus the size) of the goal object. Thus, individuals with visual form agnosia must rely on a retinal image that remains uncalibrated, leading to inaccurate calibrations of grip aperture. The fact that these individuals scaled their grasp much less accurately under the monocular viewing condition, despite showing normal binocular grasping, suggests that pictorial cues to depth, which are presumably processed by mechanisms mediating our perception of objects and events in the world, can be accessed by visuomotor mechanisms only indirectly. These results, together with others, suggest that the visuomotor system 'prefers' to use binocular information and uses pictorial cues only as a last resort.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Marotta JJ,Behrmann M,Goodale MAdoi
10.1007/pl00005731subject
Has Abstractpub_date
1997-08-01 00:00:00pages
113-21issue
1eissn
0014-4819issn
1432-1106journal_volume
116pub_type
杂志文章abstract：:The spatial properties of human binocular mechanisms were investigated using the technique of subthreshold summation. Isolation of binocular mechanisms was achieved by means of interocular stimulus presentation. The contrast detection threshold for a sinusoidal test grating viewed by one eye was found to be reduced by...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00237700
更新日期：1977-02-16 00:00:00
abstract：:The present study examines the development of grip force modulation relating to self-induced loads during repetitive vertical arm movements at different frequencies with a hand-held object. One hundred and thirty-four 3- to 6-year-old children and 16 adults were asked to move a lightweight object up and down at increa...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210000622
更新日期：2001-05-01 00:00:00
abstract：:It has been repeatedly shown that precise finger force control declines with age. The tasks and evaluation parameters used to reveal age-related differences vary between studies. In order to examine effects of task characteristics, young adults (18-25 years) and late middle-aged adults (55-65 years) performed precisio...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-012-3292-4
更新日期：2013-01-01 00:00:00
abstract：:When humans pursue motion stimuli composed of alternating constant velocity segments of randomised duration (RD), they nevertheless initiate anticipatory eye deceleration before stimulus direction changes at a pre-programmed time based on averaging prior stimulus timing. We investigated, in both the time and frequency...
journal_title：Experimental brain research
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00221-011-2725-9
更新日期：2011-07-01 00:00:00
abstract：:The effects of alteration of thyroid state on neurochemical maturation have been studied in rats made hypothyroid by daily injections of methimazole or hyperthyroid by daily supplementation with thyroid hormone (T3) from postnatal days 1 to 27. Biochemical assays on seven brain regions plus the spinal cord were carrie...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00229834
更新日期：1991-01-01 00:00:00
abstract：:Impaired plantar flexor muscle activation during push-off in late stance contributes importantly to reduced gait ability in adults with cerebral palsy (CP). Here we used low-intensity transcranial magnetic stimulation (TMS) to suppress soleus EMG activity during push-off as an estimate of corticospinal drive in CP adu...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-019-05520-3
更新日期：2019-06-01 00:00:00
abstract：:The aim of this study was to investigate the effect of single joint displacement on the pattern of leg muscle electromyographic (EMG) activity during locomotion. For the first time, unilateral rotational hip or knee joint displacements were applied by a driven orthotic device at three phases of swing during locomotion...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-004-1904-3
更新日期：2004-10-01 00:00:00
abstract：:Increased afferent input may alter receptive field sizes, properties and somatotopographic representation in the cortex. Changes in the motor thalamus may also occur as a result of altered afferent input. Such plasticity has been implicated in both sensory and movement disorders. Using tremor as a model of augmented a...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-003-1399-3
更新日期：2003-05-01 00:00:00
abstract：:Organotypic slice cultures of striatum and neocortex were prepared from newborn to seven day old rats and cultured for three to 60 days. When processed for tyrosine hydroxylase (TH) immunocytochemistry medium-sized, aspiny TH immunoreactive (TH-i) neurons with a similar morphology were revealed in the striatum and the...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00231159
更新日期：1991-01-01 00:00:00
abstract：:Corticomotor control of the human tongue has been reported to undergo neuroplastic changes following several days of training in a tongue-protrusion task. The aims of the present study were to determine if a 1 h tongue-task training is sufficient to induce signs of neuroplastic changes in the corticomotor pathways, an...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-006-0380-3
更新日期：2006-08-01 00:00:00
abstract：:The firing of neurons from layers II and III of medial entorhinal cortex (MEC) was examined in relation to the hippocampal theta rhythm in urethane anesthetized and walking rats. 1) MEC neurons showed a significant phase relation to the hippocampal theta rhythm in both walking and urethane anesthetized rats, suggestin...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00229252
更新日期：1992-01-01 00:00:00
abstract：:The relationship between phantom limb phenomena and cortical reorganization was examined in five subjects with congenital absence of an upper limb and nine traumatic amputees. Neuromagnetic source imaging revealed minimal reorganization of primary somatosensory cortex in the congenital amputees (M=0.69 cm, SD 0.24) an...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050334
更新日期：1998-03-01 00:00:00
abstract：:Primary gaze fixation is never perfectly stable but can be interrupted by involuntary, conjugate saccadic intrusions (SI). SI have a high prevalence in the normal population and are characterised by a horizontal fast eye movement away from the desired eye position, followed, after a variable duration, by a return sacc...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-004-2209-2
更新日期：2005-07-01 00:00:00
abstract：:In order to study prehension in a reproducible manner, we trained monkeys to perform a task in which rectangular, spherical, and cylindrical objects were grasped, lifted, held, and lowered in response to visual cues. The animal's hand movements were monitored using digital video, together with simultaneously recorded ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050803
更新日期：1999-08-01 00:00:00
abstract：:Intermodal attention (IA) is assumed to allocate limited neural processing resources to input from one specific sensory modality. We investigated effects of sustained IA on the amplitude of a 40-Hz auditory (ASSR) and a 4.3-Hz visual steady-state response (VSSR). To this end, we concurrently presented amplitude-modula...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-011-2667-2
更新日期：2011-09-01 00:00:00
abstract：:Humans are extraordinarily skilled in the tactile evaluation of, and differentiation between, surfaces. The chemical and mechanical properties of these surfaces are translated into tactile signals during haptic exploration by mechanoreceptors in our skin, which are specialized to respond to different types of temporal...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-020-05831-w
更新日期：2020-06-01 00:00:00
abstract：:For 1 week, healthy human participants ( n=7) were devoid of normal vision by exposure to prism lenses that optically rotated their perceived world around the line of sight by 180 degrees. Adaptation to such prisms involved sustained and vigorous practice of the ability to redirect the unadapted efferent motor command...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-002-1097-6
更新日期：2002-06-01 00:00:00
abstract：:We compared pursuit responses to 2D target motion in three separate conditions: predictable, randomised and randomised with timing cues. The target moved on a continuous quadrilateral path in which right-angle direction changes allowed anticipatory eye acceleration and deceleration in orthogonal axes to be assessed. R...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-014-4164-x
更新日期：2015-03-01 00:00:00
abstract：:Within the substantia nigra, anatomical, neurochemical and pharmacological findings strongly suggest that transmitter and protein are secreted from the dendrites of nigrostriatal neurones. This phenomenon may underlie a non classical modulatory cellular mechanism. Two conductances are generated in nigrostriatal neuron...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00248875
更新日期：1989-01-01 00:00:00
abstract：:The pattern of gamma-efferent innervation of the muscle spindle was investigated in the peroneus tertius muscle of the cat. A number of spindle group Ia afferents were isolated and monitored during tetanic stimulation of isolated gamma-axons. The sample was dominated by efferents producing a static fusimotor effect on...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00236812
更新日期：1983-01-01 00:00:00
abstract：:Studies of movement-related cortical potentials (MRCPs) for simple movements have shown a slowly rising negativity (Bereitschaftspotential, or BP) about 2 s prior to movement onset, centered in the bilateral sensorimotor area. However, complex movements may elicit a different temporal and spatial distribution of this ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-005-2314-x
更新日期：2005-06-01 00:00:00
abstract：:In 15 musicians, cortical DC-potentials were recorded from the scalp before and during the execution of bimanual motor sequences. Subjects (Ss) either tapped with their two index fingers in synchrony (quavers against quavers; "2 against 2") or they tapped quavers against triplets ("2 against 3"). Either the right or t...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00229320
更新日期：1990-01-01 00:00:00
abstract：:Nerve cell bodies located within the white matter of the dorsal funiculus (DF neurons) have been previously observed but not described in detail. The present study examines the morphology, ontogeny, and projection of DF neurons utilizing Fluoro-Gold as a retrograde tracer, alone, and in combination with tritiated thym...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228128
更新日期：1990-01-01 00:00:00
abstract：:The convergence of the posterior semicircular canal (PC) and utricular (UT) inputs in single vestibular nuclei neurons was studied intracellularly in decerebrate cats. A total of 160 vestibular neurons were orthodromically activated by selective stimulation of the PC and the UT nerve and classified according to whethe...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210000336
更新日期：2000-05-01 00:00:00
abstract：:In many daily situations, balance control is associated with a cognitive activity such as reading or a simple calculation. The objective of this study was to investigate the relationship between these two specific human activities, especially the influence of visual cues and support surface stability on body sway duri...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-014-3913-1
更新日期：2014-07-01 00:00:00
abstract：:It is known that attending to a cutaneous stimulus briefly increases its subjective intensity. The purpose of the present study was to determine whether an extended period of attention would produce a longer-lasting perceptual amplification. Eighty subjects were assigned alternately to experimental and control groups....
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-020-05910-y
更新日期：2020-11-05 00:00:00
abstract：:Any passive rigid inertial object that we hold in our hand, e.g., a tennis racquet, imposes a field of forces on the arm that depends on limb position, velocity, and acceleration. A fundamental characteristic of this field is that the forces due to acceleration and velocity are linearly separable in the intrinsic coor...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-005-0163-2
更新日期：2006-03-01 00:00:00
abstract：:The amygdala has been demonstrated to contribute to pain-related behavior and food preference. Here, the effect of pain on food preference and food-matched visual-cue memory, in the presence or absence of a basolateral amygdala (BLA) lesion, has been evaluated using a novel innovative apparatus and protocol. Forty adu...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-020-05961-1
更新日期：2020-10-26 00:00:00
abstract：:Central conduction time is the time for an afferent volley to traverse the central pathways of a sensory system. In the present study, central auditory conduction time (CACT) was calculated for the rat, the first such formal measurement in any animal. Brainstem auditory evoked potentials (BAEPs) were recorded simultan...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228892
更新日期：1990-01-01 00:00:00
abstract：:The fluorescent dye diamidino yellow was injected into parts of the developing visual and auditory systems in the rat. The dye was retrogradely transported by projecting neurones and was found to stain pyknotic profiles within the labelled cell populations. It is thus possible to visualize directly the death of neuron...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228865
更新日期：1990-01-01 00:00:00
