Reward magnitude effects on temporal discrimination

Reward magnitude and learning in a single-presentation discrimination.

The purpose of this experiment was to study the effect of amount of reward on performance in a single-presentation discrimination. Rats were reinforced for running down a gray alley to a black goalbox (S) but were not reinforced in a white goalbox (S~). Half the ,5s received a large reward, and half received a small reward. Generalizing from single-runway studies (Crespi, 1943), one would expec...

Theory meets pigeons: the influence of reward-magnitude on discrimination-learning.

Modern theoretical accounts on reward-based learning are commonly based on reinforcement learning algorithms. Most noted in this context is the temporal-difference (TD) algorithm in which the difference between predicted and obtained reward, the prediction-error, serves as a learning signal. Consequently, larger rewards cause bigger prediction-errors and lead to faster learning than smaller rew...

The Discrimination of Magnitude

Multiple-look effects on temporal discrimination within sound sequences

The multiple-look notion holds that the difference limen (DL) decreases with multiple observations. We investigated this notion for temporal discrimination in isochronous sound sequences. In Experiment 1, we established a multiple-look effect when sequences comprised nine standard time intervals (S) followed by an increasing number of comparison time intervals (C), but no multiple-look effect w...

Effects of temporal cueing on residual visual discrimination in blindsight.

We tested the ability of a blindsight patient, GY, to identify in which of two locations a target was presented in a spatial two-alternative forced choice paradigm (spatial 2AFC). On each trial the subject was asked to make a second manual response indicating whether he had had any awareness of an event occurring during the trial. A cue, presented at the fixation location, could signal the 0.4 ...