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Salience (neuroscience)

salience psychology, salience network neuroscience
The salience also called saliency of an item – be it an object, a person, a pixel, etc – is the state or quality by which it stands out relative to its neighbors Saliency detection is considered to be a key attentional mechanism that facilitates learning and survival by enabling organisms to focus their limited perceptual and cognitive resources on the most pertinent subset of the available sensory data

Saliency typically arises from contrasts between items and their neighborhood, such as a red dot surrounded by white dots, a flickering message indicator of an answering machine, or a loud noise in an otherwise quiet environment Saliency detection is often studied in the context of the visual system, but similar mechanisms operate in other sensory systems What is salient can be influenced by training: for example, for human subjects particular letters can become salient by training12

When attention deployment is driven by salient stimuli, it is considered to be bottom-up, memory-free, and reactive Attention can also be guided by top-down, memory-dependent, or anticipatory mechanisms, such as when looking ahead of moving objects or sideways before crossing streets Humans and other animals have difficulty paying attention to more than one item simultaneously, so they are faced with the challenge of continuously integrating and prioritizing different bottom-up and top-down influences

Contents

  • 1 Neuroanatomy
  • 2 In psychology
  • 3 Aberrant salience hypothesis of schizophrenia
  • 4 Visual saliency modeling
  • 5 See also
  • 6 References
  • 7 External links

Neuroanatomyedit

The hippocampus participates in the assessment of salience and context using past memories to filter new incoming stimuli; placing those that are most important into long term memory The entorhinal cortex is the pathway into and out of the hippocampus and is damaged early on in Alzheimer's diseasecitation needed

The pulvinar nuclei in the thalamus modulate physical saliency in attentional selection3

The nucleus accumbens shell assigns incentive salience "want" and "desire" to rewarding stimuli, where reward is the attractive and motivational property of a stimulus that induces appetitive behavior – also known as approach behavior – and consummatory behavior45

In psychologyedit

The term is widely used in the study of perception and cognition to refer to any aspect of a stimulus that, for any of many reasons, stands out from the rest Salience may be the result of emotional, motivational or cognitive factors and is not necessarily associated with physical factors such as intensity, clarity or size Although salience is thought to determine attentional selection, salience associated with physical factors does not necessarily influence selection of a stimulus6

Aberrant salience hypothesis of schizophreniaedit

Kapur 2003 proposed that a hyperdopaminergic state, at a "brain" level of description, leads to an aberrant assignment of salience to the elements of one's experience, at a "mind" level7 Dopamine mediates the conversion of the neural representation of an external stimulus from a neutral bit of information into an attractive or aversive entity, ie a salient event8 Symptoms of schizophrenia may arise out of 'the aberrant assignment of salience to external objects and internal representations', and antipsychotic medications reduce positive symptoms, by attenuating aberrant motivational salience, via blockade of the dopamine D2 receptors Kapur, 2003

Visual saliency modelingedit

In the domain of psychology, efforts have been made in modeling the mechanism of human attention, including the learning of prioritizing the different bottom-up and top-down influences9

In the domain of computer vision, efforts have been made in modeling the mechanism of human attention, especially the bottom-up attentional mechanism10 Such a process is also called visual saliency detection

Generally speaking, there are two kinds of models to mimic the bottom-up saliency mechanism One way is based on the spatial contrast analysis For example, in "A Model of Saliency-Based Visual Attention for Rapid Scene Analysis",11 a center-surround mechanism is used to define saliency across scales, which is inspired by the putative neural mechanism The other way is based on the frequency domain analysis This method was first proposed by Hou et al12 While they used the amplitude spectrum to assign saliency to rarely occurring magnitudes, Guo et al use the phase spectrum instead13 Recently, Li et al introduced a system that uses both the amplitude and the phase information14

A key limitation in many such approaches is their computational complexity which produces less than real-time performance, even on modern computer hardware1113 Some recent work attempts to overcome these issues but at the expense of saliency detection quality under some conditions15 Other work suggests that saliency and associated speed-accuracy phenomena may be a fundamental mechanisms of recognition determined during recognition through gradient descent and does not have to be spatial in nature16

See alsoedit

  • Dopamine hypothesis of schizophrenia
  • Latent inhibition
  • Schizophrenia
  • Schizotypy

Referencesedit

  1. ^ Schneider, W & Shiffrin, R M 1977 "Controlled and automatic human information processing: I detection, search, and attention" Psychological Review 84 1: 1–66 doi:101037/0033-295x8411 
  2. ^ Shiffrin, R M & Schneider, W 1977 "Controlled and automatic human information processing: II perceptual learning, automatic attending and a general theory" Psychological Review 84 2: 127–190 doi:101037/0033-295x842127 
  3. ^ Snow JC; Allen HA; Rafal RD; Humphreys GW March 2009 "Impaired attentional selection following lesions to human pulvinar: evidence for homology between human and monkey" Proc Natl Acad Sci USA 106 10: 4054–9 doi:101073/pnas0810086106 PMC 2656203 PMID 19237580 
  4. ^ Malenka RC, Nestler EJ, Hyman SE 2009 Sydor A, Brown RY, eds Molecular Neuropharmacology: A Foundation for Clinical Neuroscience 2nd ed New York: McGraw-Hill Medical pp 147–148, 367, 376 ISBN 978-0-07-148127-4 VTA DA neurons play a critical role in motivation, reward-related behavior Chapter 15, attention, and multiple forms of memory This organization of the DA system, wide projection from a limited number of cell bodies, permits coordinated responses to potent new rewards Thus, acting in diverse terminal fields, dopamine confers motivational salience “wanting” on the reward itself or associated cues nucleus accumbens shell region, updates the value placed on different goals in light of this new experience orbital prefrontal cortex, helps consolidate multiple forms of memory amygdala and hippocampus, and encodes new motor programs that will facilitate obtaining this reward in the future nucleus accumbens core region and dorsal striatum In this example, dopamine modulates the processing of sensorimotor information in diverse neural circuits to maximize the ability of the organism to obtain future rewards 
    The brain reward circuitry that is targeted by addictive drugs normally mediates the pleasure and strengthening of behaviors associated with natural reinforcers, such as food, water, and sexual contact Dopamine neurons in the VTA are activated by food and water, and dopamine release in the NAc is stimulated by the presence of natural reinforcers, such as food, water, or a sexual partner 
    The NAc and VTA are central components of the circuitry underlying reward and memory of reward As previously mentioned, the activity of dopaminergic neurons in the VTA appears to be linked to reward prediction The NAc is involved in learning associated with reinforcement and the modulation of motoric responses to stimuli that satisfy internal homeostatic needs The shell of the NAc appears to be particularly important to initial drug actions within reward circuitry; addictive drugs appear to have a greater effect on dopamine release in the shell than in the core of the NAc 
  5. ^ Schultz W 2015 "Neuronal reward and decision signals: from theories to data" Physiological Reviews 95 3: 853–951 doi:101152/physrev000232014 PMC 4491543 PMID 26109341 Rewards in operant conditioning are positive reinforcers  Operant behavior gives a good definition for rewards Anything that makes an individual come back for more is a positive reinforcer and therefore a reward Although it provides a good definition, positive reinforcement is only one of several reward functions  Rewards are attractive They are motivating and make us exert an effort  Rewards induce approach behavior, also called appetitive or preparatory behavior, and consummatory behavior  Thus any stimulus, object, event, activity, or situation that has the potential to make us approach and consume it is by definition a reward  Rewarding stimuli, objects, events, situations, and activities consist of several major components First, rewards have basic sensory components visual, auditory, somatosensory, gustatory, and olfactory  Second, rewards are salient and thus elicit attention, which are manifested as orienting responses FIGURE 1, middle The salience of rewards derives from three principal factors, namely, their physical intensity and impact physical salience, their novelty and surprise novelty/surprise salience, and their general motivational impact shared with punishers motivational salience A separate form not included in this scheme, incentive salience, primarily addresses dopamine function in addiction and refers only to approach behavior as opposed to learning  Third, rewards have a value component that determines the positively motivating effects of rewards and is not contained in, nor explained by, the sensory and attentional components FIGURE 1, right This component reflects behavioral preferences and thus is subjective and only partially determined by physical parameters Only this component constitutes what we understand as a reward It mediates the specific behavioral reinforcing, approach generating, and emotional effects of rewards that are crucial for the organism’s survival and reproduction, whereas all other components are only supportive of these functions  These emotions are also called liking for pleasure and wanting for desire in addiction research 471 and strongly support the learning and approach generating functions of reward 
  6. ^ Tsakanikos, E 2004 "Latent inhibition, visual pop-out and schizotypy: is disruption of latent inhibition due to enhanced stimulus salience" Personality and Individual Differences 37: 1347–1358 doi:101016/jpaid200401005 
  7. ^ Kapur, S 2003 "Psychosis as a state of aberrant salience: a framework linking biology, phenomenology, and pharmacology in schizophrenia" American Journal of Psychiatry 160: 13–23 doi:101176/appiajp160113 PMID 12505794 
  8. ^ Berridge, KC; Robinson, TE 1998 "What is the role of dopamine in reward: hedonic impact, reward learning, or incentive salience" PDF Brain Research Review 28: 309–369 doi:101016/s0165-01739800019-8 
  9. ^ van de Laar, P, Heskes, T and Gielen S August 1997 "Task-Dependent Learning of Attention" Neural Networks 10 6: 981–992 doi:101016/S0893-60809700031-2  CS1 maint: Multiple names: authors list link
  10. ^ Frintrop S, Rome E & Christensen HI 2010 "Computational Visual Attention Systems and their Cognitive Foundation: A Survey" ACM Transactions on Applied Perception 7
  11. ^ a b Itti L; Koch C; Niebur E 1998 "A Model of Saliency-Based Visual Attention for Rapid Scene Analysis" IEEE Trans Pattern Anal Mach Intell 20 11: 1254–1259 doi:101109/34730558 
  12. ^ Hou X; Zhang L 2007 "Saliency Detection: A Spectral Residual Approach" IEEE CVPR 
  13. ^ a b Guo C, Ma Q & Zhang L 2008 "Spatio-temporal saliency detection using phase spectrum of quaternion fourier transform" IEEE Conference on Computer Vision and Pattern Recognition 
  14. ^ Li J; Levine MD; An X; Xu X; He H 2012 "Visual Saliency Based on Scale-Space Analysis in the Frequency Domain" PDF IEEE Trans Pattern Anal Mach Intell 35 4: 996–1010 doi:101109/TPAMI2012147 PMID 22802112 
  15. ^ Katramados, I, Breckon, TP September 2011 "Real-time Visual Saliency by Division of Gaussians" Proc International Conference on Image Processing PDF IEEE pp 1741–1744 doi:101109/ICIP20116115785 Retrieved 8 April 2013  CS1 maint: Multiple names: authors list link
  16. ^ Achler T 2013 "Supervised Generative Reconstruction: An Efficient Way To Flexibly Store and Recognize Patterns" arXiv:11122988 

External linksedit

  • Itti L; Koch C March 2001 "Computational modelling of visual attention" Nat Rev Neurosci 2 3: 194–203 doi:101038/35058500 PMID 11256080 
  • iLab at the University of Southern California
  • Scholarpedia article on visual saliency by Prof Laurent Itti
  • Huang, J-B; Ahuja, Narendra 2012 "Saliency Detection via Divergence Analysis: An Unified Perspective" PDF ICPR 
  • Saliency map at Scholarpedia

salience in neuroscience, salience medical definition, salience network neuroscience, salience psychology, salience psychology meaning


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    Salience (neuroscience) beatiful post thanks!

    29.10.2014


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