Sneve, Markus H. and Alnaes, Dag and Endestad, Tor and Greenlee, Mark W. and Magnussen, Svein (2012) Visual short-term memory: Activity supporting encoding and maintenance in retinotopic visual cortex. NEUROIMAGE, 63 (1). pp. 166-178. ISSN 1053-8119,
Full text not available from this repository. (Request a copy)Abstract
Recent studies have demonstrated that retinotopic cortex maintains information about visual stimuli during retention intervals. However, the process by which transient stimulus-evoked sensory responses are transformed into enduring memory representations is unknown. Here, using fMRI and short-term visual memory tasks optimized for univariate and multivariate analysis approaches, we report differential involvement of human retinotopic areas during memory encoding of the low-level visual feature orientation. All visual areas show weaker responses when memory encoding processes are interrupted, possibly due to effects in orientation-sensitive primary visual cortex (V1) propagating across extrastriate areas. Furthermore, intermediate areas in both dorsal (V3a/b) and ventral (LO1/2) streams are significantly more active during memory encoding compared with non-memory (active and passive) processing of the same stimulus material. These effects in intermediate visual cortex are also observed during memory encoding of a different stimulus feature (spatial frequency), suggesting that these areas are involved in encoding processes on a higher level of representation. Using pattern-classification techniques to probe the representational content in visual cortex during delay periods, we further demonstrate that simply initiating memory encoding is not sufficient to produce long-lasting memory traces. Rather, active maintenance appears to underlie the observed memory-specific patterns of information in retinotopic cortex. (C) 2012 Elsevier Inc. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LATERAL OCCIPITAL COMPLEX; SPATIAL-FREQUENCY DISCRIMINATION; WORKING-MEMORY; PREFRONTAL CORTEX; REPETITION SUPPRESSION; TEMPORAL DYNAMICS; FMRI ADAPTATION; NEURAL SYSTEM; ATTENTION; ORIENTATION; fMRI; Low-level vision; Multi-voxel pattern analysis; Sensory recruitment; Working memory |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Human Sciences > Institut für Psychologie > Lehrstuhl für Psychologie I (Allgemeine Psychologie I und Methodenlehre) - Prof. Dr. Mark W. Greenlee |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 May 2020 05:59 |
| Last Modified: | 05 May 2020 05:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17948 |
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