Unimodal and crossmodal processing of visual and kinesthetic stimuli in working memory

The processing of (object) information in working memory has been intensively investigated in the visual modality (i.e. D’Esposito, 2007; Ranganath, 2006). In comparison, research on kinesthetic/haptic or crossmodal processing in working memory is still sparse. During recognition and comparison of object information across modalities, representations built from one sensory modality have to be matched with representations obtained from other senses. In the present thesis, the questions how object information is represented in unimodal and crossmodal working memory, which processes enable unimodal and crossmodal comparisons, and which neuronal correlates are associated with these processes were addressed. In particular, unimodal and crossmodal processing of visually and kinesthetically perceived object features were systematically investigated in distinct working memory phases of encoding, maintenance, and recognition. At this, the kinesthetic modality refers to the sensory perception of movement direction and spatial position, e.g. of one’s own hand, and is part of the haptic sense. Overall, the results of the present thesis suggest that modality-specific representations and modality-specific processes play a role during unimodal and crossmodal processing of object features in working memory