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Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

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https://www.readbyqxmd.com/read/29150139/visual-working-memory-performance-in-aphantasia
#1
Christianne Jacobs, Dietrich S Schwarzkopf, Juha Silvanto
Aphantasia, i.e., the congenital inability to experience voluntary mental imagery, offers a new model for studying the functional role of mental imagery in (visual) cognition. However, until now, there have been no studies investigating whether aphantasia can be linked to specific impairments in cognitive functioning. Here, we assess visual working memory performance in an aphantasic individual. We find that she performs significantly worse than controls on the most difficult (i.e., requiring the highest degree of precision) visual working memory trials...
November 8, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29149617/decoding-early-and-late-cortical-contributions-to-individuation-of-attended-and-unattended-objects
#2
Claire K Naughtin, Jason B Mattingley, Angela D Bender, Paul E Dux
To isolate a visual stimulus as a unique object with a specific spatial location and time of occurrence, it is necessary to first register (individuate) the stimulus as a distinct perceptual entity. Recent investigations into the neural substrates of object individuation have suggested it is subserved by a distributed neural network, but previous manipulations of individuation load have introduced extraneous visual confounds, which might have yielded ambiguous findings, particularly in early cortical areas...
November 8, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29137716/-a-phantasia-and-severely-deficient-autobiographical-memory-scientific-and-personal-perspectives
#3
Nicholas W Watkins
I address two interlinked aspects of the diversity in our experiences of memory and the mind's eye. I summarise the long-appreciated role of imagery in mathematics and the physical sciences, and contrast it with the evidence that some scientists have had limited or zero imagery. I then recount the story of how I became aware of my own lack of mental imagery, and the accompanying deficit in my episodic memory, how I have sought scientific understanding of these conditions, and how they have affected my life.
November 7, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29157936/short-parietal-lobe-connections-of-the-human-and-monkey-brain
#4
Marco Catani, Naianna Robertsson, Ahmad Beyh, Vincent Huynh, Francisco de Santiago Requejo, Henrietta Howells, Rachel L C Barrett, Marco Aiello, Carlo Cavaliere, Tim B Dyrby, Kristine Krug, Maurice Ptito, Helen D'Arceuil, Stephanie J Forkel, Flavio Dell'Acqua
The parietal lobe has a unique place in the human brain. Anatomically, it is at the crossroad between the frontal, occipital, and temporal lobes, thus providing a middle ground for multimodal sensory integration. Functionally, it supports higher cognitive functions that are characteristic of the human species, such as mathematical cognition, semantic and pragmatic aspects of language, and abstract thinking. Despite its importance, a comprehensive comparison of human and simian intraparietal networks is missing...
November 2, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29121485/distinct-modulation-of-interhemispheric-inhibitory-mechanisms-during-movement-preparation-reveals-the-influence-of-cognition-on-action-control
#5
Mark R Hinder, Rohan Puri, Sarah Kemp, Sara Waitzer, Paola Reissig, Tino Stöckel, Hakuei Fujiyama
When selecting actions based on visual warning stimuli (WS), corticospinal excitability (CSE) is initially suppressed, consistent with a neural mechanism to prevent premature release of the competing responses. Despite being implicated in between-hand movement selection and preparation, the role that interhemispheric inhibition (IHI) may play in this 'impulse control' mechanism is not known. Participants performed a warned, between-hand, choice reaction time (RT) task in which the informativeness of the WS (with regards to which hand would be required to respond) was manipulated...
October 27, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29137717/an-autistic-like-profile-of-attention-and-perception-in-synaesthesia
#6
Jamie Ward, Paris Brown, Jasmine Sherwood, Julia Simner
Synaesthesia and autism are two neurodevelopmental conditions that have been shown to co-occur more than expected by chance. The studies reported here test the hypothesis that increased sensory sensitivity and enhanced Attention-to-detail are core cognitive features that are shared between them. In Study 1, we administer self-report measures of sensory sensitivity and autistic traits (the Autism Spectrum Quotient, AQ) to a large heterogeneous sample of synaesthetes. Both sensory sensitivity and the Attention-to-detail subscale of the AQ show a "dose-like" relationship with synaesthesia: namely, more kinds of synaesthesia is related to a greater shift up the autistic spectrum...
October 25, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29157937/pure-word-deafness-following-left-temporal-damage-behavioral-and-neuroanatomical-evidence-from-a-new-case
#7
Chiara Maffei, Rita Capasso, Giulia Cazzolli, Cesare Colosimo, Flavio Dell'Acqua, Francesca Piludu, Marco Catani, Gabriele Miceli
Pure Word Deafness (PWD) is a rare disorder, characterized by selective loss of speech input processing. Its most common cause is temporal damage to the primary auditory cortex of both hemispheres, but it has been reported also following unilateral lesions. In unilateral cases, PWD has been attributed to the disconnection of Wernicke's area from both right and left primary auditory cortex. Here we report behavioral and neuroimaging evidence from a new case of left unilateral PWD with both cortical and white matter damage due to a relatively small stroke lesion in the left temporal gyrus...
October 23, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29146099/art-the-visual-imagination-and-neuroscience-the%C3%A2-chauvet-cave-mona-lisa-s-smile-and-michelangelo-s-terribilit%C3%A3
#8
John Onians
This paper considers several types of imagination relevant to art historical enquiry. These are exemplified in artistic expressions ranging from palaeolithic paintings in the Chauvet Cave, to drawings, sculptures and buildings designed by Michelangelo and drawings and paintings by Leonardo, and are related to recent neuroscientific discoveries. From this it emerges that important types of imagination cannot be understood without an appreciation of the neural processes that underlie them and especially without an acknowledgement of the importance of neurochemistry...
October 23, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29145007/sleep-preserves-original-and-distorted-memory-traces
#9
Scott A Cairney, Shane Lindsay, Ken A Paller, M Gareth Gaskell
Retrieval facilitates the long-term retention of memories, but may also enable stored representations to be updated with new information that is available at the time of retrieval. However, if information integrated during retrieval is erroneous, future recall can be impaired: a phenomenon known as retrieval-induced distortion (RID). Whether RID causes an "overwriting" of existing memory traces or leads to the co-existence of original and distorted memory traces is unknown. Because sleep enhances memory consolidation, the effects of sleep after RID can provide novel insights into the structure of updated memories...
October 16, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29127879/role-of-the-right-inferior-parietal-cortex-in-auditory-selective-attention-an-rtms-study
#10
Corinne A Bareham, Stanimira D Georgieva, Marc R Kamke, David Lloyd, Tristan A Bekinschtein, Jason B Mattingley
Selective attention is the process of directing limited capacity resources to behaviourally relevant stimuli while ignoring competing stimuli that are currently irrelevant. Studies in healthy human participants and in individuals with focal brain lesions have suggested that the right parietal cortex is crucial for resolving competition for attention. Following right-hemisphere damage, for example, patients may have difficulty reporting a brief, left-sided stimulus if it occurs with a competitor on the right, even though the same left stimulus is reported normally when it occurs alone...
October 16, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29100660/tracting-the-neural-basis-of-music-deficient-structural-connectivity-underlying-acquired-amusia
#11
Aleksi J Sihvonen, Pablo Ripollés, Teppo Särkämö, Vera Leo, Antoni Rodríguez-Fornells, Jani Saunavaara, Riitta Parkkola, Seppo Soinila
Acquired amusia provides a unique opportunity to investigate the fundamental neural architectures of musical processing due to the transition from a functioning to defective music processing system. Yet, the white matter (WM) deficits in amusia remain systematically unexplored. To evaluate which WM structures form the neural basis for acquired amusia and its recovery, we studied 42 stroke patients longitudinally at acute, 3-month, and 6-month post-stroke stages using DTI [tract-based spatial statistics (TBSS) and deterministic tractography (DT)] and the Scale and Rhythm subtests of the Montreal Battery of Evaluation of Amusia (MBEA)...
October 10, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29110884/looking-back-to-go-forward-promoting-single-case-studies
#12
EDITORIAL
Roberto Cubelli, Sergio Della Sala
No abstract text is available yet for this article.
October 9, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29101820/extending-the-limits-of-force-endurance-stimulation-of-the-motor-or-the-frontal-cortex
#13
Rémi Radel, Gavin Tempest, Gauthier Denis, Pierre Besson, Raphael Zory
Previous findings indicate that facilitation of primary motor cortex (PMC) activity using trans-cranial direct current stimulation (tDCS) could improve resistance to physical fatigue. However, studies have failed to consistently replicate these results. Using non-focal-tDCS during a fatiguing task, recent work showed no enhancement of corticospinal excitability of the PMC despite a longer endurance time and suggested that contamination in other brain regions involved in motor command may have occurred. In accordance with recent evidence supporting the role of the prefrontal cortex (PFC) in exercise maintenance, this double-blind sham-controlled crossover study (N = 22) compared the effect of high definition (HD)-tDCS of the PMC or the PFC on endurance time of a sustained contraction task of the elbow flexor...
October 9, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29096874/altering-spatial-priority-maps-via-statistical-learning-of-target-selection-and-distractor-filtering
#14
Oscar Ferrante, Alessia Patacca, Valeria Di Caro, Chiara Della Libera, Elisa Santandrea, Leonardo Chelazzi
The cognitive system has the capacity to learn and make use of environmental regularities - known as statistical learning (SL), including for the implicit guidance of attention. For instance, it is known that attentional selection is biased according to the spatial probability of targets; similarly, changes in distractor filtering can be triggered by the unequal spatial distribution of distractors. Open questions remain regarding the cognitive/neuronal mechanisms underlying SL of target selection and distractor filtering...
October 9, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29150140/visual-pathways-from-the-perspective-of-cost-functions-and-multi-task-deep-neural-networks
#15
REVIEW
H Steven Scholte, Max M Losch, Kandan Ramakrishnan, Edward H F de Haan, Sander M Bohte
Vision research has been shaped by the seminal insight that we can understand the higher-tier visual cortex from the perspective of multiple functional pathways with different goals. In this paper, we try to give a computational account of the functional organization of this system by reasoning from the perspective of multi-task deep neural networks. Machine learning has shown that tasks become easier to solve when they are decomposed into subtasks with their own cost function. We hypothesize that the visual system optimizes multiple cost functions of unrelated tasks and this causes the emergence of a ventral pathway dedicated to vision for perception, and a dorsal pathway dedicated to vision for action...
October 7, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29096196/task-evoked-pupil-dilation-and-bold-variance-as-indicators-of-locus-coeruleus-dysfunction
#16
Jeremy A Elman, Matthew S Panizzon, Donald J Hagler, Lisa T Eyler, Eric L Granholm, Christine Fennema-Notestine, Michael J Lyons, Linda K McEvoy, Carol E Franz, Anders M Dale, William S Kremen
Pupillary responses during cognitive tasks are linked to functioning of the locus coeruleus (LC). The LC is an early site of abnormal tau deposition, which may contribute to key aspects of Alzheimer's disease (AD) pathophysiology. We previously found attenuation of pupillary responses to increases in cognitive load in individuals with mild cognitive impairment (MCI), suggesting pupillary responses may provide a biomarker of early risk for AD associated with LC dysfunction. The LC modulates cortical activity through two modes of operation: tonic and phasic...
October 7, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29073459/physical-aggressiveness-and-gray-matter-deficits-in-ventromedial-prefrontal-cortex
#17
David S Chester, Donald R Lynam, Richard Milich, C Nathan DeWall
What causes individuals to hurt others? Since the famous case of Phineas Gage, lesions of the ventromedial prefrontal cortex (VMPFC) have been reliably linked to physically aggressive behavior. However, it is unclear whether naturally-occurring deficits in VMPFC, among normal individuals, might have widespread consequences for aggression. Using voxel based morphometry, we regressed gray matter density from the brains of 138 normal female and male adults onto their dispositional levels of physical aggression, verbal aggression, and sex, simultaneously...
October 7, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29122206/the-evolution-of-accelerated-long-term-forgetting-evidence-from-the-time-study
#18
Sharon Savage, Serge Hoefeijzers, Fraser Milton, Claire Streatfield, Michaela Dewar, Adam Zeman
OBJECTIVE: Accelerated long-term forgetting (ALF) occurs when newly learned information decays faster than normal over extended delays. It has been recognised most frequently in temporal lobe epilepsy, including Transient Epileptic Amnesia (TEA), but can also be drug-induced. Little is known about the evolution of ALF over time and its impacts upon other memory functions, such as autobiographical memory (ABM). Here we investigate the long-term outcome of ALF and ABM in a group of patients with TEA and a single case of baclofen-induced ALF...
October 6, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29096198/face-inversion-reveals-holistic-processing-of-peripheral-faces
#19
Petra Kovács, Balázs Knakker, Petra Hermann, Gyula Kovács, Zoltán Vidnyánszky
Face perception is accomplished by face-selective neural processes, involving holistic processing that enables highly efficient integration of facial features into a whole-face representation. It has been shown that in face-selective regions of the ventral temporal cortex (VTC), neural resources involved in holistic processing are primarily dedicated to the central portion of the visual field. These findings raise the intriguing possibility that holistic processing might be the privilege of centrally presented faces and could be strongly diminished in the case of peripheral faces...
October 6, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29096197/motor-cortex-inhibition-by-tms-reduces-cognitive-non-motor-procedural-learning-when-immediate-incentives-are-present
#20
Leonora Wilkinson, Philip J Koshy, Adam Steel, Devin Bageac, Selene Schintu, Eric M Wassermann
Inhibitory repetitive transcranial magnetic stimulation (rTMS) of the primary motor area (M1) impairs motor sequence-learning, but not basic motor function. It is unknown if this is specific for motor forms of procedural learning or a more general effect. To investigate, we tested the effect of M1-inhibition on the weather prediction task (WPT), a learning task with minimal motor learning component. In the WPT, participants learn arbitrary, probabilistic, associations between sets of meaningless cues and fictional outcomes...
October 6, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
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