Short-term memory for item, temporal, and spatial information in young and elderly

1991 ◽  
Author(s):  
Robert E. Till ◽  
Alice F. Healy ◽  
Thomas F. Cunningham ◽  
Lyle E. Bourne
Keyword(s):  
Spatial Information ◽  
Short Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Temporal And Spatial

The ring dove's short-term memory capacity for spatial information

1981 ◽  
Vol 29 (2) ◽  
pp. 639-641 ◽  
Author(s):  
Donald M. Wilkie ◽  
Marcia L. Spetch ◽  
Lincoln Chew
Keyword(s):  
Spatial Information ◽  
Short Term Memory ◽  
Memory Capacity ◽  
Short Term ◽  
Term Memory

Improvement of Visual Short-Term Memory Characteristics in Monkeys: Effect of an Antioxidant

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 115-115
Author(s):  
I V Chueva ◽  
K N Dudkin
Keyword(s):  
Reaction Time ◽  
Spatial Information ◽  
Short Term Memory ◽  
Information Storage ◽  
Motor Reaction ◽  
Short Term ◽  
Systemic Injection ◽  
Term Memory ◽  
Motor Reaction Time ◽  
Visual Short Term Memory

Visual short-term memory was tested in a delayed-discrimination task on rhesus monkeys before and after a systemic injection of the antioxidant oxymetacil (4 – 7 mg kg−1). Monkeys had to discriminate stimuli with different visual attributes (colour, orientation, spatial frequency, size, contrast, spatial relationships between visual objects) by a delayed (0 – 32 s) instrumental reflex. Oxymetacil had no influence upon visual discrimination without delay, but after injection of this drug the delayed discrimination (associated with mechanisms of short-term memory) of different stimuli was significantly improved. Oxymetacil increased the duration of short-term storage of spatial information by a factor of 2 – 4 and decreased motor reaction time. Application of oxymetacil in the same doses produced similar results for delayed discrimination of black-and-white gratings, or geometrical figures of different orientations and size. The duration of short-term information storage was doubled or trebled and the motor reaction time was decreased. If monkeys were required to discriminate colour figures, the duration of short-term information storage was also doubled, being longer than for any of the other tasks. The results are discussed in terms of effects on cortical interregional synchronisation mechanisms responsible for control processes such as attention.

The dangers of taking capacity limits too literally

2001 ◽  
Vol 24 (1) ◽  
pp. 114-115 ◽  
Author(s):  
S. E. Avons ◽  
Geoff Ward ◽  
Riccardo Russo
Keyword(s):  
Empirical Data ◽  
Short Term Memory ◽  
Spatial Context ◽  
Long Term Memory ◽  
Alternative Account ◽  
Short Term ◽  
Term Memory ◽  
Capacity Limits ◽  
Temporal And Spatial

The empirical data do not unequivocally support a consistent fixed capacity of four chunks. We propose an alternative account whereby capacity is limited by the precision of specifying the temporal and spatial context in which items appear, that similar psychophysical constraints limit number estimation, and that short term memory (STM) is continuous with long term memory (LTM).

Deficits in Verbal Long-Term Memory and Learning in Children with Poor Phonological Short-Term Memory Skills

2008 ◽  
Vol 61 (3) ◽  
pp. 474-490 ◽  
Author(s):  
Susan E. Gathercole ◽  
Josie Briscoe ◽  
Annabel Thorn ◽  
Claire Tiffany ◽  
Keyword(s):  
Spatial Information ◽  
Short Term Memory ◽  
Memory Function ◽  
Verbal Material ◽  
Long Term Memory ◽  
Short Term ◽  
Memory And Learning ◽  
Term Memory ◽  
Memory Group

Possible links between phonological short-term memory and both longer term memory and learning in 8-year-old children were investigated in this study. Performance on a range of tests of long-term memory and learning was compared for a group of 16 children with poor phonological short-term memory skills and a comparison group of children of the same age with matched nonverbal reasoning abilities but memory scores in the average range. The low-phonological-memory group were impaired on longer term memory and learning tasks that taxed memory for arbitrary verbal material such as names and nonwords. However, the two groups performed at comparable levels on tasks requiring the retention of visuo-spatial information and of meaningful material and at carrying out prospective memory tasks in which the children were asked to carry out actions at a future point in time. The results are consistent with the view that poor short-term memory function impairs the longer term retention and ease of learning of novel verbal material.

scholarly journals Lane Position Detection Based on Long Short-Term Memory (LSTM)

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3115
Author(s):  
Wei Yang ◽  
Xiang Zhang ◽  
Qian Lei ◽  
Dengye Shen ◽  
Ping Xiao ◽  
...  
Keyword(s):  
Spatial Information ◽  
Short Term Memory ◽  
Driving Safety ◽  
Detection Accuracy ◽  
Short Term ◽  
Distribution Law ◽  
Position Information ◽  
Term Memory ◽  
Position Detection ◽  
Long Short Term Memory

Accurate detection of lane lines is of great significance for improving vehicle driving safety. In our previous research, by improving the horizontal and vertical density of the detection grid in the YOLO v3 (You Only Look Once, the 3th version) model, the obtained lane line (LL) algorithm, YOLO v3 (S × 2S), has high accuracy. However, like the traditional LL detection algorithms, they do not use spatial information and have low detection accuracy under occlusion, deformation, worn, poor lighting, and other non-ideal environmental conditions. After studying the spatial information between LLs and learning the distribution law of LLs, an LL prediction model based on long short-term memory (LSTM) and recursive neural network (RcNN) was established; the method can predict the future LL position by using historical LL position information. Moreover, by combining the LL information predicted with YOLO v3 (S × 2S) detection results using Dempster Shafer (D-S) evidence theory, the LL detection accuracy can be improved effectively, and the uncertainty of this system be reduced correspondingly. The results show that the accuracy of LL detection can be significantly improved in rainy, snowy weather, and obstacle scenes.

Shared long-term and short-term memory representational formats in occipital and parietal cortex

2021 ◽  
Author(s):  
Vy A. Vo ◽  
David W. Sutterer ◽  
Joshua J. Foster ◽  
Thomas C. Sprague ◽  
Edward Awh ◽  
...  
Keyword(s):  
Parietal Cortex ◽  
Spatial Information ◽  
Short Term Memory ◽  
Memory Task ◽  
Memory Systems ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Sensory Evoked

AbstractCurrent theories propose that the short-term retention of information in working memory (WM) and the recall of information from long-term memory (LTM) are supported by overlapping neural mechanisms in occipital and parietal cortex. Both are thought to rely on reinstating patterns of sensory activity evoked by the perception of the remembered item. However, the extent of the shared representations between WM and LTM are unclear, and it is unknown how WM and LTM representations may differ across cortical regions. We designed a spatial memory task that allowed us to directly compare the representations of remembered spatial information in WM and LTM. Critically, we carefully matched the precision of behavioral responses in these tasks. We used fMRI and multivariate pattern analyses to examine representations in (1) retinotopic cortex and (2) lateral parietal cortex (LPC) regions previously implicated in LTM. We show that visual memories were represented in a sensory-like code in both tasks across retinotopic regions in occipital and parietal cortex. LPC regions also encoded remembered locations in both WM and LTM, but in a format that differed from the sensory-evoked activity. These results suggest a striking correspondence in the format of WM and LTM representations across occipital and parietal cortex. On the other hand, we show that activity patterns in nearly all parietal regions, but not occipital regions, contained information that could discriminate between WM trials and LTM trials. Our data provide new evidence for theories of memory systems and the representation of mnemonic content.

scholarly journals Decay and Interference Effects in Visuospatial Short-Term Memory

Perception ◽  
1996 ◽  
Vol 25 (1) ◽  
pp. 53-64 ◽  
Author(s):  
Graham J Hole
Keyword(s):  
Interstimulus Interval ◽  
Spatial Information ◽  
Short Term Memory ◽  
Mental Representations ◽  
Interference Effects ◽  
Short Term ◽  
Term Memory ◽  
The Third ◽  
Spatial Interval ◽  
Method Of Constant Stimuli

The method of constant stimuli was used to examine the accuracy with which two-dimensional spatial information can be represented in mental images. In experiment 1, subjects had to decide which of two successively presented two-dot separations was wider. Over the range of interstimulus intervals employed (0 to 30 s), there was a linear relationship between interstimulus interval and spatial interval thresholds. In experiment 2 subjects' abilities to represent accurately more than one spatial interval at a time was investigated. Three dot pairs were presented, but only two pairs were to be compared, the third being completely irrelevant to the task. This manipulation doubled thresholds (relative to a two-dot-pair control condition), whether or not subjects were obliged to attend to the irrelevant dots. Overall, the results suggest that mental representations of spatial information may be temporally durable, but only in the absence of extraneous stimuli. The latter not only disrupt memory for spatial information, but appear to have obligatory access to it.

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