eprintid: 1514406
rev_number: 27
eprint_status: archive
userid: 608
dir: disk0/01/51/44/06
datestamp: 2016-09-04 18:01:52
lastmod: 2021-09-20 22:37:20
status_changed: 2017-05-03 11:18:50
type: article
metadata_visibility: show
creators_name: Cavanagh, SE
creators_name: Malalasekera, N
creators_name: Kennerley, SW
title: In the blink of an eye: Value and novelty drive saccades
ispublished: pub
divisions: UCL
divisions: B02
divisions: C07
divisions: D07
divisions: F84
note: Copyright © 2015. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0. Access may be initially restricted by the publisher.
abstract: Evidence accumulation is an essential component of value-based decisions. Recent human studies suggest that overt attention correlates with evidence accumulation necessary for optimal decisions. However, the influence of covert attention on decision-making remains relatively unexplored.
To investigate this issue, two monkeys were trained to perform a decision-making task where they chose between two stimuli, which were either ‘Overtrained’ or learned that day (‘Novel’). Subjects could freely saccade during choice evaluation and indicated their decision by moving a joystick. Saccades were made within 170 ms of stimulus presentation and were strongly driven by both value and novelty, implying covert stimulus evaluation prior to saccade. This effect was strongest for ‘Overtrained’ choices, but rapidly emerged during learning of ‘Novel’ choices. Though novel stimuli attracted initial saccades, final decisions were guided only by value; implying attentional value comparison processes are at least partially dissociable from value comparison processes that govern final decisions. While subjects made highly optimal decisions, they frequently viewed only one stimulus; final choice was thus best explained by assuming covert evidence accumulation. Our results suggest that the primate brain contains multiple value comparison systems for guiding attention toward highly valuable or novel information while simultaneously optimizing final decision value.
date: 2015-09
date_type: published
official_url: http://dx.doi.org/10.1016/j.amsu.2015.07.013
oa_status: green
full_text_type: pub
pmcid: PMC4991740
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1155121
doi: 10.1016/j.amsu.2015.07.013
lyricists_name: Cavanagh, Sean
lyricists_name: Kennerley, Steven
lyricists_id: SECAV40
lyricists_id: SWKEN38
full_text_status: public
publication: Annals of Medicine and Surgery
volume: 4
number: 3
pagerange: 319-320
issn: 2049-0801
citation:        Cavanagh, SE;    Malalasekera, N;    Kennerley, SW;      (2015)    In the blink of an eye: Value and novelty drive saccades.                   Annals of Medicine and Surgery , 4  (3)   pp. 319-320.    10.1016/j.amsu.2015.07.013 <https://doi.org/10.1016/j.amsu.2015.07.013>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1514406/1/Kennerly_Final_1-s2.0-S2049080115000709-main.pdf