scholarly journals Prioritization of new objects during visual search is limited by the capacity of visual short-term memory

2010 ◽  
Vol 7 (9) ◽  
pp. 661-661
Author(s):  
N. Al-Aidroos ◽  
S. M. Emrich ◽  
J. Pratt ◽  
S. Ferber
Keyword(s):  
Visual Search ◽  
Short Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Visual Short Term Memory

scholarly journals Using Visual Change Detection to Examine the Functional Architecture of Visual Short-Term Memory

2020 ◽  
Author(s):  
Alex Burmester
Keyword(s):  
Visual Search ◽  
Short Term Memory ◽  
Change Blindness ◽  
Internal Representation ◽  
Target Object ◽  
Visual Exploration ◽  
Scene Analysis ◽  
Short Term ◽  
Term Memory ◽  
Visual Short Term Memory

A common problem in vision research is explaining how humans perceive a coherent, detailed and stable world despite the fact that the eyes make constant,jumpy movements and the fact that only a small part of the visual field can beresolved in detail at any one time. This is essentially a problem of integrationover time - how successive views of the visual world can be used to create theimpression of a continuous and stable environment. A common way of studyingthis problem is to use complete visual scenes as stimuli and present a changedscene after a disruption such as an eye movement or a blank screen. It is found inthese studies that observers have great difficulty detecting changes made duringa disruption, even though these changes are immediately and easily detectablewhen the disruption is removed. These results have highlighted the importance ofmotion cues in tracking changes to the environment, but also reveal the limitednature of the internal representation. Change blindness studies are interestingas demonstrations but can be difficult to interpret as they are usually applied tocomplex, naturalistic scenes. More traditional studies of scene analysis, such asvisual search, are more abstract in their formulation, but offer more controlledstimulus conditions. In a typical visual search task, observers are presented withan array of objects against a uniform background and are required to report onthe presence or absence of a target object that is differentiable from the otherobjects in some way. More recently, scene analysis has been investigated bycombining change blindness and visual search in the ‘visual search for change’paradigm, in which observers must search for a target object defined by a changeover two presentations of the set of objects. The experiments of this thesis investigate change blindness using the visual search for change paradigm, but alsouse principles of design from psychophysical experiments, dealing with detectionand discrimination of basic visual qualities such as colour, speed, size, orientationand spatial frequency. This allows the experiments to precisely examine the roleof these different features in the change blindness process. More specifically, theexperiments are designed to look at the capacity of visual short-term memory fordifferent visual features, by examining the retention of this information acrossthe temporal gaps in the change blindness experiments. The nature and fidelityof representations in visual short-term memory is also investigated by manipulating (i) the manner in which featural information is distributed across space andobjects, (ii) the time for which the information is available, (iii) the manner inwhich observers must respond to that information. Results point to a model inwhich humans analyse objects in a scene at the level of features/attributes ratherthan at a pictorial/object level. Results also point to the fact that the working representations which humans retain during visual exploration are similarlyfeature- rather than object-based. In conclusion the thesis proposes a model ofscene analysis in which attention and vSTM capacity limits are used to explainthe results from a more information theoretic standpoint.

Dynamic Visual Noise Affects Visual Short-Term Memory for Surface Color, but not Spatial Location

2010 ◽  
Vol 57 (1) ◽  
pp. 17-26 ◽  
Author(s):  
Kevin Dent
Keyword(s):  
Short Term Memory ◽  
Spatial Location ◽  
Visual Noise ◽  
Dynamic Visual Noise ◽  
Short Term ◽  
Surface Color ◽  
Term Memory ◽  
Visual Short Term Memory ◽  
Experimental Tool ◽  
Spatial Locations

In two experiments participants retained a single color or a set of four spatial locations in memory. During a 5 s retention interval participants viewed either flickering dynamic visual noise or a static matrix pattern. In Experiment 1 memory was assessed using a recognition procedure, in which participants indicated if a particular test stimulus matched the memorized stimulus or not. In Experiment 2 participants attempted to either reproduce the locations or they picked the color from a whole range of possibilities. Both experiments revealed effects of dynamic visual noise (DVN) on memory for colors but not for locations. The implications of the results for theories of working memory and the methodological prospects for DVN as an experimental tool are discussed.

Time Window from Visual Images to Visual Short-Term Memory: Consolidation or Integration?

2004 ◽  
Vol 51 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Yuhong Jiang
Keyword(s):  
Short Term Memory ◽  
Time Window ◽  
Short Interval ◽  
Visual Images ◽  
Short Term ◽  
Temporal Window ◽  
Term Memory ◽  
Visual Short Term Memory ◽  
Probe Task ◽  
Long Time

Abstract. When two dot arrays are briefly presented, separated by a short interval of time, visual short-term memory of the first array is disrupted if the interval between arrays is shorter than 1300-1500 ms ( Brockmole, Wang, & Irwin, 2002 ). Here we investigated whether such a time window was triggered by the necessity to integrate arrays. Using a probe task we removed the need for integration but retained the requirement to represent the images. We found that a long time window was needed for performance to reach asymptote even when integration across images was not required. Furthermore, such window was lengthened if subjects had to remember the locations of the second array, but not if they only conducted a visual search among it. We suggest that a temporal window is required for consolidation of the first array, which is vulnerable to disruption by subsequent images that also need to be memorized.

Visual search and short-term memory in the deaf.

1973 ◽  
Author(s):  
Stanislav Dornic ◽  
Ragnar Hagdahl ◽  
Gote Hanson
Keyword(s):  
Visual Search ◽  
Short Term Memory ◽  
Short Term ◽  
Term Memory
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