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Direct injection of noise to the visual cortex decreases accuracy but increases decision confidence.

Publication ,  Journal Article
Rahnev, DA; Maniscalco, B; Luber, B; Lau, H; Lisanby, SH
Published in: J Neurophysiol
March 2012

The relationship between accuracy and confidence in psychophysical tasks traditionally has been assumed to be mainly positive, i.e., the two typically increase or decrease together. However, recent studies have reported examples of exceptions, where confidence and accuracy dissociate from each other. Explanations for such dissociations often involve dual-channel models, in which a cortical channel contributes to both accuracy and confidence, whereas a subcortical channel only contributes to accuracy. Here, we show that a single-channel model derived from signal detection theory (SDT) can also account for such dissociations. We applied transcranial magnetic stimulation (TMS) to the occipital cortex to disrupt the internal representation of a visual stimulus. The results showed that consistent with previous research, occipital TMS decreased accuracy. However, counterintuitively, it also led to an increase in confidence ratings. The data were predicted well by a single-channel SDT model, which posits that occipital TMS increased the variance of the internal stimulus distributions. A formal model comparison analysis that used information theoretic methods confirmed that this model was preferred over single-channel models, in which occipital TMS changed the signal strength or dual-channel models, which assume two different processing routes. Thus our results show that dissociations between accuracy and confidence can, at least in some cases, be accounted for by a single-channel model.

Duke Scholars

Published In

J Neurophysiol

DOI

EISSN

1522-1598

Publication Date

March 2012

Volume

107

Issue

6

Start / End Page

1556 / 1563

Location

United States

Related Subject Headings

  • Visual Perception
  • Visual Cortex
  • Transcranial Magnetic Stimulation
  • Signal Detection, Psychological
  • Reaction Time
  • Photic Stimulation
  • Neurology & Neurosurgery
  • Male
  • Humans
  • Female
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Rahnev, D. A., Maniscalco, B., Luber, B., Lau, H., & Lisanby, S. H. (2012). Direct injection of noise to the visual cortex decreases accuracy but increases decision confidence. J Neurophysiol, 107(6), 1556–1563. https://doi.org/10.1152/jn.00985.2011
Rahnev, Dobromir A., Brian Maniscalco, Bruce Luber, Hakwan Lau, and Sarah H. Lisanby. “Direct injection of noise to the visual cortex decreases accuracy but increases decision confidence.J Neurophysiol 107, no. 6 (March 2012): 1556–63. https://doi.org/10.1152/jn.00985.2011.
Rahnev DA, Maniscalco B, Luber B, Lau H, Lisanby SH. Direct injection of noise to the visual cortex decreases accuracy but increases decision confidence. J Neurophysiol. 2012 Mar;107(6):1556–63.
Rahnev, Dobromir A., et al. “Direct injection of noise to the visual cortex decreases accuracy but increases decision confidence.J Neurophysiol, vol. 107, no. 6, Mar. 2012, pp. 1556–63. Pubmed, doi:10.1152/jn.00985.2011.
Rahnev DA, Maniscalco B, Luber B, Lau H, Lisanby SH. Direct injection of noise to the visual cortex decreases accuracy but increases decision confidence. J Neurophysiol. 2012 Mar;107(6):1556–1563.

Published In

J Neurophysiol

DOI

EISSN

1522-1598

Publication Date

March 2012

Volume

107

Issue

6

Start / End Page

1556 / 1563

Location

United States

Related Subject Headings

  • Visual Perception
  • Visual Cortex
  • Transcranial Magnetic Stimulation
  • Signal Detection, Psychological
  • Reaction Time
  • Photic Stimulation
  • Neurology & Neurosurgery
  • Male
  • Humans
  • Female