6/22/2023 0 Comments Sensory memory pictures![]() More recently however, neuroimaging studies have found that early areas of the visual cortex are activated during imagery tasks as well as later visual areas –. Some neuroimaging studies have found no significant increase in neural activity in the early visual areas during imagery tasks –. Interestingly the neural correlates of imagery have provoked a debate similar to the one in the visual working memory literature. ![]() ![]() ![]() There have been suggestions that visual working memory may involve mental imagery, , such propositions dovetail nicely with the visual spatial sketchpad component of composite theories of working memory. Behavioural studies support the involvement of early visual cortex, as they suggests that visual working memory can maintain visual information at a resolution typically only observed in early visual cortex –. Likewise, the neural correlates of visual working memory have stirred up considerable debate, with some studies reporting sustained activity in high-level neural structures – while others, more recently, reporting early-level visual cortex. The storage mechanism and capacity limits of visual working memory have been and remain controversial, –. The study of working memory has long been an area of interest for researchers due to its ubiquity in daily life, its close links to many high-level cognitive functions, psychopathologies and the large individual variability present in both performance and capacity –. These findings could help reconcile current controversy regarding the mechanism and location of visual mnemonic storage. Individuals with poor imagery still performed above chance in the visual working memory task, but their performance was not affected by the background luminance, suggesting a dichotomy in strategies for visual working memory: individuals with strong mental imagery rely on sensory-based imagery to support mnemonic performance, while those with poor imagery rely on different strategies. This suggests that luminance signals were disrupting sensory-based imagery mechanisms and not a general working memory system. In addition, for individuals with strong imagery, modulating the background luminance diminished performance on visual working memory and imagery tasks, but not working memory for number strings. Here we show that performance in visual working memory - but not iconic visual memory - can be predicted by the strength of mental imagery as assessed with binocular rivalry in a given individual. Despite recent efforts, capacity limits, their genesis and the underlying neural structures of visual working memory remain unclear. Experiment 5 demonstrated that subjects are able to use this sensory code as the sole basis for recognition memory.Visual working memory provides an essential link between past and future events. Experiments 3 and 4 combined the two responses and showed that the basis for the sensory match effect in recognition memory was a subject's ability to recognize the matching fragments in the absence of conceptual information (when the test stimulus could not be identified), supporting the idea that the episodic trace of the sensory code is responsible for the sensory match effect in recognition memory. Instead, recognition memory showed a robust overall sensory match effect (the same fragmented image was recognized better than the complementary image), whereas fragment identification showed no overall sensory match effect (the same fragmented image was identified no better than the complementary fragmented image). Assuming that fragment identification is a direct measure of perceptual fluency, we expected identical patterns of results across the two tests if perceptual fluency accounted for the sensory match effect in recognition memory. This paper examines the basis for the sensory match effect by manipulating whether a studied fragmented picture is tested with the same or a complementary set of fragments in a recognition memory test (Experiment 1) and in a fragment-identification test (Experiment 2). The sensory match effect in recognition memory refers to the finding that recognition is better when the sensory form in which an item is tested is the same as that in which it was studied.
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