Abstract：
:In everyday life, we constantly need to remember the temporal sequence of visual events over short periods of time, for example, when making sense of others' actions or watching a movie. While there is increasing knowledge available on neural mechanisms underlying visual working memory (VWM) regarding the identity and spatial location of objects, less is known about how the brain encodes and retains information on temporal sequences. Here, we investigate whether the contralateral-delay activity (CDA), a well-studied electroencephalographic (EEG) component associated with VWM of object identity, also reflects the encoding and retention of temporal order. In two independent experiments, we presented participants with a sequence of four or six images, followed by a 1 s retention period. Participants judged temporal order by indicating whether a subsequently presented probe image was originally displayed during the first or the second half of the sequence. As a main novel result, we report the emergence of a contralateral negativity already following the presentation of the first item of the sequence, which increases over the course of a trial with every presented item, up to a limit of four items. We further observed no differences in the CDA during the temporal-order task compared to one obtained during a task concerning the spatial location of the presented items. Since the characteristics of the CDA appear to be highly similar between different encoded feature dimensions and increases as additional items are being encoded, we suggest this component might be a general characteristic of various types of VWM.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Pomper U,Ditye T,Ansorge Udoi
10.1016/j.neuropsychologia.2019.03.012subject
Has Abstractpub_date
2019-06-01 00:00:00pages
104-116eissn
0028-3932issn
1873-3514pii
S0028-3932(18)30562-1journal_volume
129pub_type
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