Abstract
Sequence-space synesthetes experience some sequences (e.g., numbers, calendar units) as arranged in spatial forms, i.e., spatial patterns in their mind's eye or even outside their body. Various explanations have been offered for this phenomenon. Here we argue that these spatial forms are continuous with varieties of non-synesthetic visuospatial imagery and share their central characteristics. This includes their dynamic and elaborative nature, their involuntary feel, and consistency over time. Drawing from literatures on mental imagery and working memory, we suggest how the initial acquisition and subsequent elaboration of spatial forms could be accounted for in terms of the known developmental trajectory of visuospatial representations. This extends from the formation of image-based representations of verbal material in childhood to the later maturation of dynamic control of imagery. Individual differences in the development of visuospatial style also account for variation in the character of spatial forms, e.g., in terms of distinctions such as visual versus spatial imagery, or ego-centric versus object-based transformations.
Highlights
Drawing from literatures on mental imagery and working memory, we suggest how the initial acquisition and subsequent elaboration of spatial forms could be accounted for in terms of the known developmental trajectory of visuospatial representations
We offer here a speculative summary of how initial acquisition and subsequent elaboration of spatial forms could be accounted for in terms of the known developmental trajectory of visuospatial representations, drawing from the interconnected literatures on mental imagery and visuospatial working memory
On grounds of explanatory parsimony, we suggest that standard mechanisms for the production and transformation of conscious visuospatial representations are at very least involved in mediating spatial forms, perhaps even sufficient (Price and Mattingley, 2013; Price, in press)
Summary
In sequence-space synesthesia, sequences members such as calendar units or numerals are felt to occupy locations within an explicit spatial layout of sequence members – a spatial form – that resides in imaginal or extra-bodily space, and ranges from simple 2D to intricate 3D arrangements (Cytowic and Eagleman, 2009; Simner, 2009; Price and Mattingley, 2013; Jonas and Jarick, in press; Price, in press). Drawing from literatures on mental imagery and working memory, we suggest how the initial acquisition and subsequent elaboration of spatial forms could be accounted for in terms of the known developmental trajectory of visuospatial representations.
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