Rhizomatic Learning in Action: A Virtual Exposition for Demonstrating Learning Rhizomes

In this paper, we developed a virtual exposition as a model to visualize and demonstrate the dynamic and non-linear affordances of a learning rhizome. Virtual expositions are non-linear multimodal web installations that facilitate the creation of interconnections through which the research as practice and the practice as research are highlighted and communicated more effectively. Through a specific virtual exposition platform, we created a visual and performative representation of a rhizomatic learning course, allowing visitors to experience the complexity, multiplicity, unpredictability, and multivoicedness of such an approach in an isomorphic way. A complex learning rhizome is a performative confluence of human and non-human actors that engages people, resources, processes, and contextual parameters. As such, it is impossible to be represented in any representational format. The virtual exposition developed here attempts to offer a fair approximative model of rhizomatic learning which is far better than text-only linear representations. This paper offers a new view to rhizomatic learning as an applied practice that can enhance teaching and catalyze learning through complex synergies and dynamics. The originality of this paper lies in its attempt to bridge linear with non-linear academic research formats in order to offer a multimodal and performative model of rhizomatic learning. Theoretical and practical implications for learning and teaching are discussed.

Tracking stimulus representation across a 2-back visual working memory task

How does the neural representation of visual working memory content vary with behavioural priority? To address this, we recorded electroencephalography (EEG) while subjects performed a continuous-performance 2-back working memory task with oriented-grating stimuli. We tracked the transition of the neural representation of an item ( n ) from its initial encoding, to the status of ‘unprioritized memory item' (UMI), and back to ‘prioritized memory item', with multivariate inverted encoding modelling. Results showed that the representational format was remapped from its initially encoded format into a distinctive ‘opposite' representational format when it became a UMI and then mapped back into its initial format when subsequently prioritized in anticipation of its comparison with item n + 2. Thus, contrary to the default assumption that the activity representing an item in working memory might simply get weaker when it is deprioritized, it may be that a process of priority-based remapping helps to protect remembered information when it is not in the focus of attention.

Categorical representation from sound and sight in the ventral occipito-temporal cortex of sighted and blind

Is vision necessary for the development of the categorical organization of the Ventral Occipito-Temporal Cortex (VOTC)? We used fMRI to characterize VOTC responses to eight categories presented acoustically in sighted and early blind individuals, and visually in a separate sighted group. We observed that VOTC reliably encodes sound categories in sighted and blind people using a representational structure and connectivity partially similar to the one found in vision. Sound categories were, however, more reliably encoded in the blind than the sighted group, using a representational format closer to the one found in vision. Crucially, VOTC in blind represents the categorical membership of sounds rather than their acoustic features. Our results suggest that sounds trigger categorical responses in the VOTC of congenitally blind and sighted people that partially match the topography and functional profile of the visual response, despite qualitative nuances in the categorical organization of VOTC between modalities and groups.

Categorical representation from sound and sight in the ventral occipito-temporal cortex of sighted and blind

Is vision necessary for the development of the categorical organization of the Ventral Occipito-Temporal Cortex (VOTC)? We used fMRI to characterize VOTC responses to eight categories presented acoustically in sighted and early blind individuals, and visually in a separate sighted group. We observed that VOTC reliably encodes sound categories in sighted and blind people using a representational structure and connectivity partially similar to the one found in vision. Sound categories were, however, more reliably encoded in the blind than the sighted group, using a representational format closer to the one found in vision. Crucially, VOTC in blind represents the categorical membership of sounds rather than their acoustic features. Our results suggest that sounds trigger categorical responses in the VOTC of congenitally blind and sighted people that partially match the topography and functional profile of the visual response, despite qualitative nuances in the categorical organization of VOTC between modalities and groups.

Representational formats in medial temporal lobe and neocortex also determine subjective memory features

Episodic memories are shaped by the representational format of their contents. These formats are not only determined by medial temporal lobe areas, but essentially also by the neocortical regions which these areas control. The representational formats of medial temporal lobe and neocortex are sufficient to determine both, memory contents and subjective memory qualities, without the further need for an attribution system.

Navigating cognition: Spatial codes for human thinking

The hippocampal formation has long been suggested to underlie both memory formation and spatial navigation. We discuss how neural mechanisms identified in spatial navigation research operate across information domains to support a wide spectrum of cognitive functions. In our framework, place and grid cell population codes provide a representational format to map variable dimensions of cognitive spaces. This highly dynamic mapping system enables rapid reorganization of codes through remapping between orthogonal representations across behavioral contexts, yielding a multitude of stable cognitive spaces at different resolutions and hierarchical levels. Action sequences result in trajectories through cognitive space, which can be simulated via sequential coding in the hippocampus. In this way, the spatial representational format of the hippocampal formation has the capacity to support flexible cognition and behavior.

Speaking of death

As a human-specific trait, language offers a unique window on human cognition. Grammatical constraints on the ways we speak about events, for instance, have long been thought to reveal the representational formats that our minds impose on the ways that we think about events. In recent research, verbs that name events of death have stood out as key counterexamples to standard theories of the grammatical constraints on possible verbs. The special status of these thanatological verbs raises two important questions: why, given the vast number of verbs in any language, is it that verbs of death hold this special status, and what do they tell us about the restrictions on the representational format for possible verbs? This paper reexamines the evidence coming from verbs of death, confirming that they are counterexamples to standard theories, but that their behaviour suggests a more revealing constraint on our mental representations—that our minds impose strict restrictions on the format of asserted meaning. Thus, the constraints on linguistic representation and the human mind offer a unique perspective on the mental representations of thanatological phenomena. This article is part of the theme issue ‘Evolutionary thanatology: impacts of the dead on the living in humans and other animals’.

The Object : Substance :: Event : Process Analogy

Beginning at least with Bach (1986), semanticists have suggested that objects are formally parallel to events in the way substances are formally parallel to processes. This chapter investigates whether these parallels can be understood to reflect a shared representational format in cognition, which underlies aspects of the intuitive metaphysics of these categories. The authors of this chapter hypothesized that a way of counting (atomicity) is necessary for object and event representations, unlike for substance or process representations. Atomicity is strongly implied by plural but not mass language. The chapter investigates the language–perception interface across these domains using minimally different images and animations, designed either to encourage atomicity (‘natural’ breaks) or to discourage it (‘unnatural’ breaks). The experiments test preference for naming such stimuli with mass or count syntax. The results support Bach’s analogy in perception and highlight the formal role of atomicity in object and event representation.

Implicit Bias: from social structure to representational format

In this paper, I argue against the view that the representational structure of the implicit attitudes responsible for implicitly biased behaviour is propositional—as opposed to associationist. The proposal under criticism moves from the claim that implicit biased behaviour can occasionally be modulated by logical and evidential considerations to the view that the structure of the implicit attitudes responsible for such biased behaviour is propositional. I argue, in particular, against the truth of this conditional. Sensitivity to logical and evidential considerations, I contend, proves to be an inadequate criterion for establishing the true representational structure of implicit attitudes. Considerations of a different kind, which emphasize the challenges posed by the structural social injustice that implicit attitudes reflect, offer, I conclude, better support for deciding this issue in favour of an associationist view.

A Layered Experience of Lightness and Color

One of the fundamental debates about our experience of lightness and color involves their representational format. Some theories assert that the visual system decomposes the input into a layered representation of separated causes, whereas other theories do not. This chapter presents a variety of phenomena that directly demonstrate that layered image decompositions can play a causal role in our experience of lightness and color and discusses the theoretical implications and unresolved issues that are raised by these effects. The issue of the relationship between transparency and occlusion is discussed, as is relevance of the transparency phenomena to the problem of lightness and color perception more generally, which is an ongoing research problem and unresolved issue.