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Perceptual learning

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https://www.readbyqxmd.com/read/29777983/young-infants-discrimination-of-subtle-phonetic-contrasts
#1
Megha Sundara, Céline Ngon, Katrin Skoruppa, Naomi H Feldman, Glenda Molina Onario, James L Morgan, Sharon Peperkamp
It is generally accepted that infants initially discriminate native and non-native contrasts and that perceptual reorganization within the first year of life results in decreased discrimination of non-native contrasts, and improved discrimination of native contrasts. However, recent findings from Narayan, Werker, and Beddor (2010) surprisingly suggested that some acoustically subtle native-language contrasts might not be discriminated until the end of the first year of life. We first provide countervailing evidence that young English-learning infants can discriminate the Filipino contrast tested by Narayan et al...
May 16, 2018: Cognition
https://www.readbyqxmd.com/read/29777741/effect-of-exposure-to-similar-flavours-in-sensory-specific-satiety-implications-for-eating-behaviour
#2
Ana González, Sergio Andrés Recio, Jesús Sánchez, Marta Gil, Isabel de Brugada
Sensory-specific satiety (SSS) refers to a decline in pleasantness of eaten foods in comparison to other non-ingested meals. Although SSS is specific to the eaten food, it can also generalize to other meals that share similar properties to the satiated food. It is possible that this phenomenon could become more specific after extensive experience, as repeated exposure to an assortment of similar food could cause perceptual learning (i.e. an increase in the distinctiveness of each specific item). This in turn would reduce generalization from the consumed food to other similar products, so they will be more readily consumed...
May 16, 2018: Appetite
https://www.readbyqxmd.com/read/29777043/new-advances-in-amblyopia-therapy-i-binocular-therapies-and-pharmacologic-augmentation
#3
Courtney L Kraus, Susan M Culican
Amblyopia therapy options have traditionally been limited to penalisation of the non-amblyopic eye with either patching or pharmaceutical penalisation. Solid evidence, mostly from the Pediatric Eye Disease Investigator Group, has validated both number of hours a day of patching and days per week of atropine use. The use of glasses alone has also been established as a good first-line therapy for both anisometropic and strabismic amblyopia. Unfortunately, visual acuity equalisation or even improvement is not always attainable with these methods...
May 18, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29775823/plasticity-of-population-coding-in-primary-sensory-cortex
#4
REVIEW
Amy M LeMessurier, Daniel E Feldman
That experience shapes sensory tuning in primary sensory cortex is well understood. But effective neural population codes depend on more than just sensory tuning. Recent population imaging and recording studies have characterized population codes in sensory cortex, and tracked how they change with sensory manipulations and training on perceptual learning tasks. These studies confirm sensory tuning changes, but also reveal other features of plasticity, including sensory gain modulation, restructuring of firing correlations, and differential routing of information to output pathways...
May 15, 2018: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29775623/unsupervised-visual-discrimination-learning-of-complex-stimuli-accuracy-bias-and-generalization
#5
Rodrigo Montefusco-Siegmund, Mauricio Toro, Pedro E Maldonado, María de la L Aylwin
Through same-different judgements, we can discriminate an immense variety of stimuli and consequently, they are critical in our everyday interaction with the environment. The quality of the judgements depends on familiarity with stimuli. A way to improve the discrimination is through learning, but to this day, we lack direct evidence of how learning shapes the same-different judgments with complex stimuli. We studied unsupervised visual discrimination learning in 42 participants, as they performed same-different judgments with two types of unfamiliar complex stimuli in the absence of labeling or individuation...
May 15, 2018: Vision Research
https://www.readbyqxmd.com/read/29766509/acceleration-and-deceleration-at-constant-speed-systematic-modulation-of-motion-perception-by-kinematic-sonification
#6
Alfred O Effenberg, Gerd Schmitz
Many domains of human behavior are based on multisensory representations. Knowledge about the principles of multisensory integration is useful to configure real-time movement information for the online support of perceptuomotor processes (motor perception, control, and learning). A powerful method for generating real-time information is movement sonification. Remarkable evidence exists on movement-acoustic real-time information being effective in behavioral domains (music training, motor rehabilitation, sports)...
May 16, 2018: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/29761961/-study-on-method-of-laparoscopic-training-based-on-eye-gaze-tracking-techniques
#7
Mingzhe Xu, Shuyi Wang, Shasha Ye
In current domestic research on laparoscopic training, researchers usually consider instrument movement path in the hand-eye coordination relationship. However, they ignore the information contained in visual cues by which could guide and control instrument movements. Studies in other areas have shown that trainers can improve their perceptual-motor skills by gaze training. This paper was designed to examine the effectiveness of eye gaze tracking technology in laparoscopic training and to analyze gaze strategy of the subjects in different training methods...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29757735/from-sparse-coding-significance-to-perceptual-quality-a-new-approach-for-image-quality-assessment
#8
Ayyoub Ahar, Adriaan Barri, Peter Schelkens
An increasing number of image processing applications require an automated quality prediction of the visual content as perceived by humans. Since, sparse coding is suggested to be an underlying strategy of the brain's neural system, it would be logical to assume that specific tasks like quality assessment also attempt to adhere to this strategy. However, existing perceptual quality predictors, often mimicking the different stages of the human visual system and deploying machine learning strategies, such as neural networks, rarely integrate the concept of sparse coding in their design...
February 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29754464/clapping-in-time-parallels-literacy-and-calls-upon-overlapping-neural-mechanisms-in-early-readers
#9
Silvia Bonacina, Jennifer Krizman, Travis White-Schwoch, Nina Kraus
The auditory system is extremely precise in processing the temporal information of perceptual events and using these cues to coordinate action. Synchronizing movement to a steady beat relies on this bidirectional connection between sensory and motor systems, and activates many of the auditory and cognitive processes used when reading. Here, we use Interactive Metronome, a clinical intervention technology requiring an individual to clap her hands in time with a steady beat, to investigate whether the links between literacy and synchronization skills, previously established in older children, are also evident in children who are learning to read...
May 12, 2018: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/29752660/classification-errors-and-response-times-over-multiple-distributed-sessions-as-a-function-of-category-structure
#10
Derek E Zeigler, Ronaldo Vigo
Learning difficulty orderings for categorical stimuli have long provided an empirical foundation for concept learning and categorization research. The conventional approach seeks to determine learning difficulty orderings in terms of mean classification accuracy. However, it is relatively rare that the stability of such orderings is tested over a period of extended learning. Further, research rarely explores dependent variables beyond classification accuracy that may also indicate relative learning difficulty, such as classification response times (RTs)...
May 11, 2018: Memory & Cognition
https://www.readbyqxmd.com/read/29750987/the-opportunity-cost-of-time-modulates-cognitive-effort
#11
A Ross Otto, Nathaniel D Daw
A spate of recent work demonstrates that humans seek to avoid the expenditure of cognitive effort, much like physical effort or economic resources. Less is clear, however, about the circumstances dictating how and when people decide to expend cognitive effort. Here we adopt a popular theory of opportunity costs and response vigor and to elucidate this question. This account, grounded in Reinforcement Learning, formalizes a trade-off between two costs: the harder work assumed necessary to emit faster actions and the opportunity cost inherent in acting more slowly (i...
May 8, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29748284/efficient-coding-explains-the-universal-law-of-generalization-in-human-perception
#12
Chris R Sims
Perceptual generalization and discrimination are fundamental cognitive abilities. For example, if a bird eats a poisonous butterfly, it will learn to avoid preying on that species again by generalizing its past experience to new perceptual stimuli. In cognitive science, the "universal law of generalization" seeks to explain this ability and states that generalization between stimuli will follow an exponential function of their distance in "psychological space." Here, I challenge existing theoretical explanations for the universal law and offer an alternative account based on the principle of efficient coding...
May 11, 2018: Science
https://www.readbyqxmd.com/read/29747856/paradoxical-decision-making-a-framework-for-understanding-cognition-in-parkinson-s-disease
#13
REVIEW
Alessandra Perugini, Jochen Ditterich, Aasef G Shaikh, Barbara J Knowlton, Michele A Basso
People with Parkinson's disease (PD) show impaired decision-making when sensory and memory information must be combined. This recently identified impairment results from an inability to accumulate the proper amount of information needed to make a decision and appears to be independent of dopamine tone and reinforcement learning mechanisms. Although considerable work focuses on PD and decisions involving risk and reward, in this Opinion article we propose that the emerging findings in perceptual decision-making highlight the multisystem nature of PD, and that unraveling the neuronal circuits underlying perceptual decision-making impairment may help in understanding other cognitive impairments in people with PD...
May 7, 2018: Trends in Neurosciences
https://www.readbyqxmd.com/read/29745711/rapid-visual-perception-of-interracial-crowds-racial-category-learning-from-emotional-segregation
#14
Sarah Ariel Lamer, Timothy D Sweeny, Michael Louis Dyer, Max Weisbuch
Drawing from research on social identity and ensemble coding, we theorize that crowd perception provides a powerful mechanism for social category learning. Crowds include allegiances that may be distinguished by visual cues to shared behavior and mental states, providing perceivers with direct information about social groups and thus a basis for learning social categories. Here, emotion expressions signaled group membership: to the extent that a crowd exhibited emotional segregation (i.e., was segregated into emotional subgroups), a visible characteristic (race) that incidentally distinguished emotional subgroups was expected to support categorical distinctions...
May 2018: Journal of Experimental Psychology. General
https://www.readbyqxmd.com/read/29742133/visual-perceptual-training-reconfigures-post-task-resting-state-functional-connectivity-with-a-feature-representation-region
#15
Mitra Taghizadeh Sarabi, Ryuta Aoki, Kaho Tsumura, Ruedeerat Keerativittayayut, Koji Jimura, Kiyoshi Nakahara
The neural mechanisms underlying visual perceptual learning (VPL) have typically been studied by examining changes in task-related brain activation after training. However, the relationship between post-task "offline" processes and VPL remains unclear. The present study examined this question by obtaining resting-state functional magnetic resonance imaging (fMRI) scans of human brains before and after a task-fMRI session involving visual perceptual training. During the task-fMRI session, participants performed a motion coherence discrimination task in which they judged the direction of moving dots with a coherence level that varied between trials (20, 40, and 80%)...
2018: PloS One
https://www.readbyqxmd.com/read/29740289/two-photon-functional-imaging-of-the-auditory-cortex-in-behaving-mice-from-neural-networks-to-single-spines
#16
Ruijie Li, Meng Wang, Jiwei Yao, Shanshan Liang, Xiang Liao, Mengke Yang, Jianxiong Zhang, Junan Yan, Hongbo Jia, Xiaowei Chen, Xingyi Li
In vivo two-photon Ca2+ imaging is a powerful tool for recording neuronal activities during perceptual tasks and has been increasingly applied to behaving animals for acute or chronic experiments. However, the auditory cortex is not easily accessible to imaging because of the abundant temporal muscles, arteries around the ears and their lateral locations. Here, we report a protocol for two-photon Ca2+ imaging in the auditory cortex of head-fixed behaving mice. By using a custom-made head fixation apparatus and a head-rotated fixation procedure, we achieved two-photon imaging and in combination with targeted cell-attached recordings of auditory cortical neurons in behaving mice...
2018: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29735014/value-generalization-in-human-avoidance-learning
#17
Agnes Norbury, Trevor W Robbins, Ben Seymour
Generalization during aversive decision-making allows us to avoid a broad range of potential threats following experience with a limited set of exemplars. However, over-generalization, resulting in excessive and inappropriate avoidance, has been implicated in a variety of psychological disorders. Here, we use reinforcement learning modelling to dissect out different contributions to the generalization of instrumental avoidance in two groups of human volunteers ( N =26, N =482). We found that generalization of avoidance could be parsed into perceptual and value-based processes, and further, that value-based generalization could be subdivided into that relating to aversive and neutral feedback - with corresponding circuits including primary sensory cortex, anterior insula, amygdala and ventromedial prefrontal cortex...
May 8, 2018: ELife
https://www.readbyqxmd.com/read/29731380/a-perceptual-method-to-rate-dysphonic-voices
#18
Jorge A Gurlekian, Humberto M Torres, Melissa Rincón Cediel
OBJECTIVE: To present and test a production-matching method with external references, looking at the improvement of inter-rater variability of expert evaluations. METHOD: It consists of adjusting quality attribute levels of a synthetic vowel for a simultaneous matching with the natural patient vowel (NPV) attributes. In an initial experiment, seven speech-language pathology (SLP) experts performed this task with the new method and evaluated the same NPV with the standard method...
May 3, 2018: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/29729006/improving-resolution-of-mr-images-with-an-adversarial-network-incorporating-images-with-different-contrast
#19
Ki Hwan Kim, Won-Joon Do, Sung-Hong Park
PURPOSE: The routine MRI scan protocol consists of multiple pulse sequences that acquire images of varying contrast. Since high frequency contents such as edges are not significantly affected by image contrast, down-sampled images in one contrast may be improved by high resolution (HR) images acquired in another contrast, reducing the total scan time. In this study, we propose a new deep learning framework that uses HR MR images in one contrast to generate HR MR images from highly down-sampled MR images in another contrast...
May 4, 2018: Medical Physics
https://www.readbyqxmd.com/read/29725876/can-very-small-font-size-enhance-memory
#20
Vered Halamish
Presenting information in a perceptually degraded format sometimes enhances learning outcomes. However, earlier studies in which words were presented in large or small fonts in a paradigm that also involved item-by-item judgments of learning (JOLs) consistently yielded no mnemonic benefit of small fonts. Can small font size enhance memory under hitherto unexamined conditions? A series of 11 experiments was conducted to examine systematically the effect of font size on memory for words and whether it depends on the strength of the font size manipulation, whether JOLs are solicited, the format of the test, and study time...
May 3, 2018: Memory & Cognition
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