RT Journal Article
SR Electronic
T1 Performance in a GO/NOGO perceptual task reflects a balance between impulsive and instrumental components of behaviour
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 051607
DO 10.1101/051607
A1 A. Berditchevskaia
A1 R.D. Cazé
A1 S.R. Schultz
YR 2016
UL http://biorxiv.org/content/early/2016/05/03/051607.abstract
AB In recent years, simple GO/NOGO behavioural tasks have become popular due to the relative ease with which they can be combined with technologies such as in vivo multiphoton imaging. To date, it has been assumed that behavioural performance can be captured by the average performance across a session, however this neglects the effect of motivation on behaviour within individual sessions. We investigated the effect of motivation on mice performing a GO/NOGO visual discrimination task. Performance within a session tended to follow a stereotypical trajectory on a Receiver Operating Characteristic (ROC) chart, beginning with an over-motivated state with many false positives, and transitioning through a more or less optimal regime to end with a low hit rate after satiation. Our observations are reproduced by a new model, the Motivated Actor-Critic, introduced here. Our results suggest that standard measures of discriminability, obtained by averaging across a session, may significantly underestimate behavioural performance.