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Brain and Cognition

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https://www.readbyqxmd.com/read/28433922/effects-of-aging-on-prefrontal-brain-activation-during-challenging-walking-conditions
#1
Anat Mirelman, Inbal Maidan, Hagar Bernad-Elazari, Shiran Shustack, Nir Giladi, Jeffrey M Hausdorff
BACKGROUND: Deficits in cognitive domains, in particular, those related to the prefrontal cortex, contribute to diminished walking performance in complex conditions in older age. Studies using functional near infra-red spectroscopy (fNIRS) reported inconsistent findings of brain activation age-related changes in response to increased task demands. We aimed to study the effects of aging on gait and prefrontal activation in complex walking tasks with internal and external task demands. METHODS: Twenty-three healthy young adults (30...
April 20, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28407527/top-down-control-over-feedback-processing-the-probability-of-valid-feedback-affects-feedback-related-brain-activity
#2
Benjamin Ernst, Marco Steinhauser
Adaptive decision-making requires that feedback about decision outcomes is adequately processed. Recent studies have shown that fronto-central event-related potentials (ERPs) are sensitive to feedback valence and can be used as an index of feedback processing. The present study investigated whether the processes involved in feedback evaluation are affected by top-down mechanisms driven by knowledge about feedback validity. In a simple decision task, participants had to make use of feedback to learn which one of two stimuli was associated with a reward in a later test phase...
April 10, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28390217/painful-engrams-oscillatory-correlates-of-working-memory-for-phasic-nociceptive-laser-stimuli
#3
Elia Valentini, Valentina Nicolardi, Salvatore Maria Aglioti
Research suggests that working memory (WM) is impaired in chronic pain. Yet, information on how potentially noxious stimuli are maintained in memory is limited in patients as well as in healthy people. We recorded electroencephalography (EEG) in healthy volunteers during a modified delayed match-to-sample task where maintenance in memory of relevant attributes of nociceptive laser stimuli was essential for subsequent cued-discrimination. Participants performed in high and low load conditions (i.e. three vs...
April 5, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28377043/associations-between-cortical-thickness-and-neurocognitive-skills-during-childhood-vary-by-family-socioeconomic-factors
#4
Natalie H Brito, Luciane R Piccolo, Kimberly G Noble
Studies have reported associations between cortical thickness (CT) and socioeconomic status (SES), as well as between CT and cognitive outcomes. However, findings have been mixed as to whether CT explains links between SES and cognitive performance. In the current study, we hypothesized that this inconsistency may have arisen from the fact that socioeconomic factors (family income and parental education) may moderate the relation between CT and neurocognitive skills. Results indicated that associations between CT and cognitive performance did vary by SES for both language and executive function (EF) abilities...
April 1, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28371646/contextual-effects-on-cognitive-control-and-bold-activation-in-single-versus-mixed-saccade-tasks
#5
Jordan E Pierce, Jennifer E McDowell
The context or trial history of a task influences response efficiency in mixed paradigms based on cognitive control demands for task set selection. In the current study, the impact of context on prosaccade and antisaccade trials in single and mixed tasks was investigated with BOLD fMRI. Prosaccades require a look towards a newly appearing target, while antisaccades require cognitive control for prepotent response inhibition and generation of a saccade to the opposite location. Results indicated slower prosaccade reaction times and more antisaccade errors for switched than repeated or single trials, and slower antisaccade reaction times for single than mixed trials...
March 31, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28371645/preserved-appreciation-of-aesthetic-elements-of-speech-and-music-prosody-in-an-amusic-individual-a-holistic-approach
#6
Ariadne Loutrari, Marjorie Perlman Lorch
We present a follow-up study on the case of a Greek amusic adult, B.Z., whose impaired performance on scale, contour, interval, and meter was reported by Paraskevopoulos, Tsapkini, and Peretz in 2010, employing a culturally-tailored version of the Montreal Battery of Evaluation of Amusia. In the present study, we administered a novel set of perceptual judgement tasks designed to investigate the ability to appreciate holistic prosodic aspects of 'expressiveness' and emotion in phrase length music and speech stimuli...
March 31, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28365061/gaze-detection-and-gaze-cuing-in-alzheimer-s-disease
#7
Pauline M Insch, Gillian Slessor, Jill Warrington, Louise H Phillips
People with Alzheimer's disease (AD) show problems with social processing in tasks which require the understanding of others' mental states. However traditional social processing tasks are cognitively complex, which may influence the effects of AD. Less is known about how AD influences more basic aspects of social perception, such as the ability to decode eye gaze direction or follow the gaze of another. The current research assessed whether those with AD showed difficulty in both explicitly decoding subtle manipulations of gaze direction (Study 1), and reflexively following another's eye gaze (Study 2)...
March 29, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28351021/effects-of-handedness-saccadic-bilateral-eye-movements-on-the-specificity-of-past-autobiographical-memory-episodic-future-thinking
#8
Andrew Parker, Adam Parkin, Neil Dagnall
The present research investigated the effects of personal handedness and saccadic eye movements on the specificity of past autobiographical memory and episodic future thinking. Handedness and saccadic eye movements have been hypothesised to share a common functional basis in that both influence cognition through hemispheric interaction. The technique used to elicit autobiographical memory and episodic future thought involved a cued sentence completion procedure that allowed for the production of memories spanning the highly specific to the very general...
June 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28346879/the-spatial-relations-between-stimulus-and-response-determine-an-absolute-visuo-haptic-calibration-in-pantomime-grasping
#9
Shirin Davarpanah Jazi, Matthew Heath
Pantomime-grasps entail a response to an area adjacent to (i.e., spatially dissociated pantomime-grasp), or previously occupied by (i.e., no-target pantomime-grasp) a target. Previous work has reported that pantomime-grasps differ kinematically from naturalistic grasps (i.e., grasping a physical target object) - a result taken to evince that pantomime-grasps are perception-based and mediated via relative visual information. However, such actions differ not only in terms of their visual properties, but also because the former precludes haptic feedback related to a target's absolute size...
June 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28334633/now-or-not-now-the-influence-of-alexithymia-on-intertemporal-decision-making
#10
Cristina Scarpazza, Manuela Sellitto, Giuseppe di Pellegrino
Optimal intertemporal decisions arise from the balance between an emotional-visceral component, signaling the need for immediate gratification, and a rational, long-term oriented component. Alexithymia, a personality construct characterized by amplified sensitivity to internal bodily signals of arousal, may result in enhanced activation of the emotional-visceral component over the cognitive-rational one. To test this hypothesis, participants with high- and low-alexithymia level were compared at an intertemporal decision-making task, and their choice behavior correlated with their interoceptive sensitivity...
June 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28327354/the-neural-correlates-of-vertical-disparity-gradient-and-cue-conflict-in-panum-s-limiting-case
#11
Huayun Li, Huibin Jia, Ashley Chung-Fat-Yim, Laipeng Jin, Dongchuan Yu
Although Panum's limiting case has been extensively researched, only recently has it been discovered that in addition to horizontal disparity, the final perception of depth is influenced by (i) the vertical disparity gradient and (ii) the degree of cue conflict between 2D and 3D shapes. The present study examines the neural correlates of the two factors, using EEG while observers viewed several versions of stereoscopic stimuli, which depicted Panum's limiting case. In these patterns the vertical disparity gradient was varied from 0...
June 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28258035/raising-the-alarm-individual-differences-in-the-perceptual-awareness-of-masked-facial-expressions
#12
Ljubica Damjanovic, Marcel Meyer, Francisco Sepulveda
A theoretical concern in addressing the unconscious perception of emotion is the extent to which participants can access experiential properties of masked facial stimuli. Performance on a two alternative forced choice (2AFC) task as a measure of objective awareness was compared with a new measure developed to access experiential phenomena of the target-mask transition, the perceptual contrast-change sensitivity (PCCS) measure in a backward-masking paradigm with angry, happy and neutral facial expressions. Whilst 2AFC performance indicated that the targets were successfully masked, PCCS values were significantly higher in the happy-neutral face condition than in the angry-neutral face and the neutral-neutral face conditions (Experiment 1)...
June 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28257971/walking-to-a-multisensory-beat
#13
Charlotte Roy, Julien Lagarde, Dobromir Dotov, Simone Dalla Bella
Living in a complex and multisensory environment demands constant interaction between perception and action. In everyday life it is common to combine efficiently simultaneous signals coming from different modalities. There is evidence of a multisensory benefit in a variety of laboratory tasks (temporal judgement, reaction time tasks). It is less clear if this effect extends to ecological tasks, such as walking. Furthermore, benefits of multimodal stimulation are linked to temporal properties such as the temporal window of integration and temporal recalibration...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28242465/related-but-different-examining-pseudoneglect-in-audition-touch-and-vision
#14
Alison F Eardley, Stephen Darling, Paul Dumper, David Browne, Jose Van Velzen
Although researchers have consistently demonstrated a leftward attentional bias in visual and representational (e.g. tactile/mental number line) line bisection tasks, the results from audition have been mixed. Differences in methodology between auditory and visual bisection tasks, especially with regards to the location of stimuli of peripersonal versus extrapersonal space, have also meant that researchers have not been able to compare performance in visual, tactile and auditory line bisection directly. In this research, 39 neurologically typical individuals participated in standard visual and tactile line bisection tasks, together with a newly developed auditory line bisection task...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28236738/distraction-decreases-prefrontal-oxygenation-a-nirs-study
#15
Sachiyo Ozawa, Kazuo Hiraki
When near-infrared spectroscopy (NIRS) is used to measure emotion-related cerebral blood flow (CBF) changes in the prefrontal cortex regions, the functional distinction of CBF changes is often difficult because NIRS is unable to measure neural activity in deeper brain regions that play major roles in emotional processing. The CBF changes could represent cognitive control of emotion and emotional responses to emotional materials. Supposing that emotion-related CBF changes in the prefrontal cortex regions during distraction are emotional responses, we examined whether oxygenated hemoglobin (oxyHb) decreases...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28235696/what-psychological-process-is-reflected-in-the-fn400-event-related-potential-component
#16
P Andrew Leynes, Heather Bruett, Jenna Krizan, Ana Veloso
During many recognition contexts, old items elicit a more positive event-related potentials (ERPs) than new items at mid-frontal electrodes about 300-500ms. The psychological processes that are reflected in is ERP component (i.e., the FN400) has been vigorously debated. Some argue that the FN400 reflects familiarity, whereas others argue that it reflects conceptual implicit memory. Three experiments contrasted these two hypotheses by presenting pre-experimentally familiar (i.e., name-brand) products and novel, off-brand products...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28235695/the-differential-effects-of-prolonged-exercise-upon-executive-function-and-cerebral-oxygenation
#17
Gavin D Tempest, Karen Davranche, Jeanick Brisswalter, Stephane Perrey, RĂ©mi Radel
The acute-exercise effects upon cognitive functions are varied and dependent upon exercise duration and intensity, and the type of cognitive tasks assessed. The hypofrontality hypothesis assumes that prolonged exercise, at physiologically challenging intensities, is detrimental to executive functions due to cerebral perturbations (indicated by reduced prefrontal activity). The present study aimed to test this hypothesis by measuring oxygenation in prefrontal and motor regions using near-infrared spectroscopy during two executive tasks (flanker task and 2-back task) performed while cycling for 60min at a very low intensity and an intensity above the ventilatory threshold...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28193545/gaze-cueing-requires-intact-face-processing-insights-from-acquired-prosopagnosia
#18
Nicolas Burra, Dirk Kerzel, Meike Ramon
Gaze-cueing is the automatic spatial orienting of attention in the direction of perceived gaze. Participants respond faster to targets located at positions congruent with the direction of gaze, compared to incongruent ones (gaze cueing effect, GCE). However, it still remains unclear whether its occurrence depends on intact integration of information from the entire eye region or face, rather than simply the presence of the eyes per se. To address this question, we investigated the GCE in PS, an extensively studied case of pure acquired prosopagnosia...
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28189898/brain-processing-of-visual-metaphors-an-electrophysiological-study
#19
Maria J Ortiz, M D Grima Murcia, E Fernandez
No abstract text is available yet for this article.
April 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28182972/defective-imitation-of-finger-configurations-in-patients-with-damage-in-the-right-or-left-hemispheres-an-integration-disorder-of-visual-and-somatosensory-information
#20
Manabu Okita, Takashi Yukihiro, Kenzo Miyamoto, Shu Morioka, Hideto Kaba
To explore the mechanism underlying the imitation of finger gestures, we devised a simple imitation task in which the patients were instructed to replicate finger configurations in two conditions: one in which they could see their hand (visual feedback: VF) and one in which they could not see their hand (non-visual feedback: NVF). Patients with left brain damage (LBD) or right brain damage (RBD), respectively, were categorized into two groups based on their scores on the imitation task in the NVF condition: the impaired imitation groups (I-LBD and I-RBD) who failed two or more of the five patterns and the control groups (C-LBD and C-RBD) who made one or no errors...
April 2017: Brain and Cognition
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