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2014 Fiscal Year Annual Research Report

事前知識と視覚知覚 (Priors and visual perception)

Research Project

Project/Area Number 24300146
Research InstitutionThe Institute of Physical and Chemical Research

Principal Investigator

ガードナー ジャステン  独立行政法人理化学研究所, 脳科学総合研究センター, チームリーダー (70565134)

Project Period (FY) 2012-04-01 – 2015-03-31
Keywords事前知識 / Priors / fMRI / Attention / Vision / Perception
Outline of Annual Research Achievements

We have two main accomplishments with respect to the Kakenhi grant in fiscal year 2014 for which we have presented at international conferences (SfN and CoSyNe) and are preparing manuscripts for submission.

1. Switching between prior and evidence. We have examined short-term priors in a motion estimation task and found behavior that summary statistics suggested followed optimal bayesian inference was in fact a heuristic approximation. Subjects are biased towards their prior when sensory evidence is weak and back towards sensory evidence when the prior is weak just as optimality theory predicts. However, closer examination of the distribution of choices suggests that subjects were switching between their prior and evidence on different trials and not integrating the two pieces of information as predicted by standard theory. We believe that this is an important heuristic that humans can use to approximate optimality and are actively investigating its neural basis.

2. Adaptability of choice history biases. We have been examining choice history biases in a simple detection task. We have found that subjects are biased by their previous choices (typically by switching after a failure) even though this is non-optimal for the task. This suggests that this is a general prior strategy that humans have that is not overridden by current task demands. So, we therefore asked whether we could override initial biases by imposing stronger task demands to switch biases and found that we could adapt choice history biases, but this was hard to do when trying to go against existing biases.

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Causes of Carryover

26年度が最終年度であるため、記入しない。

Expenditure Plan for Carryover Budget

26年度が最終年度であるため、記入しない。

  • Research Products

    (7 results)

All 2015 2014

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results,  Acknowledgement Compliant: 2 results) Presentation (5 results) (of which Invited: 2 results)

  • [Journal Article] A case for human systems neuroscience2014

    • Author(s)
      Gardner, J. L.
    • Journal Title

      Neuroscience

      Volume: 296 Pages: 130-137

    • DOI

      10.1016/j.neuroscience.2014.06.052

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Encoding of graded changes in spatial specificity of prior cues in human visual cortex2014

    • Author(s)
      Hara, Y. and Gardner, J. L.
    • Journal Title

      Journal of Neurophysiology

      Volume: 112 Pages: 2834-2849

    • DOI

      10.1152/jn.00729.2013.

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] Expectation modulates activity in primary visual cortex2015

    • Author(s)
      Rentzeperis, I., and Gardner, J. L.
    • Organizer
      Computational and Systems Neuroscience (Cosyne) 2015
    • Place of Presentation
      Salt Lake City, USA
    • Year and Date
      2015-03-06
  • [Presentation] From contrast adaptation to efficient selection2015

    • Author(s)
      Gardner, J. L.
    • Organizer
      International Symposium on Neural Mechanisms of Vision and Cognition
    • Place of Presentation
      CiNet, 大阪
    • Year and Date
      2015-03-03
    • Invited
  • [Presentation] Neural correlates of change blindness in human early visual cortex2014

    • Author(s)
      Yeh, L-F, and Gardner, J.L.
    • Organizer
      Neuroscience 2014
    • Place of Presentation
      横浜
    • Year and Date
      2014-11-16
  • [Presentation] Neural correlates of change blindness in human early visual cortex2014

    • Author(s)
      Yeh, L-F, and Gardner, J.L.
    • Organizer
      第37回日本神経科学大会
    • Place of Presentation
      Washington DC, USA
    • Year and Date
      2014-09-11
  • [Presentation] Efficient selection of sensory signals for attention2014

    • Author(s)
      Gardner, J. L.
    • Organizer
      Summer Institute in Cognitive Neuroscience
    • Place of Presentation
      University of California, Santa Barbara
    • Year and Date
      2014-06-25
    • Invited

URL: 

Published: 2016-06-01  

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