King's College London

Research portal

A model of partial reference frame transforms through pooling of gain-modulated responses

Research output: Contribution to journalArticle

Original languageEnglish
Article numberbhs117v2
Pages (from-to)1230-1239
Number of pages10
JournalCerebral Cortex
Volume23
Issue number5
Early online date16 May 2012
DOIs
Publication statusPublished - May 2013

Documents

  • A Model of Partial Reference Frame Transforms through Pooling of Gain-Modulated Responses

    partial_transforms.pdf, 970 KB, application/pdf

    21/07/2015

    Accepted author manuscript

    This is a pre-copyedited, author-produced PDF of an article accepted for publication in Cerebral Cortex following peer review. The definitive publisher-authenticated version [Kris De Meyer and Michael W. Spratling 'A Model of Partial Reference Frame Transforms Through Pooling of Gain-Modulated Responses' Cereb. Cortex (2013) 23 (5): 1230-1239 first published online May 16, 2012 doi:10.1093/cercor/bhs117] is available online at: http://cercor.oxfordjournals.org/content/23/5/1230.full

King's Authors

Abstract

In multimodal integration and sensorimotor transformation areas of the posterior parietal cortex (PPC), neural responses often appear encoded in spatial reference frames that are intermediate to the intrinsic sensory reference frames, for example, eye-centered for visual or head-centered for auditory stimulation. Many sensory responses in these areas are also modulated by direction of gaze. We demonstrate that certain types of mixed-frame responses can be generated by pooling gain-modulated responses—similar to how complex cells in the visual cortex are thought to pool the responses of simple cells. The proposed model simulates 2 types of mixed-frame responses observed in the PPC: in particular, sensory responses that shift differentially with gaze in horizontal and vertical dimensions and sensory responses that shift differentially for different start and end points along a single dimension of gaze. We distinguish these 2 types of mixed-frame responses from a third type in which sensory responses shift a partial yet approximately equal amount with each gaze shift. We argue that the empirical data on mixed-frame responses may be caused by multiple mechanisms, and we adapt existing reference-frame measures to distinguish between the different types. Finally, we discuss how mixed-frame responses may be revealing of the local organization of presynaptic responses.

Download statistics

No data available

View graph of relations

© 2018 King's College London | Strand | London WC2R 2LS | England | United Kingdom | Tel +44 (0)20 7836 5454