Type

Journal Article

Authors

Simon P Kelly
Mark A Bellgrove
Edmund Lalor
Daniel P Newman
Redmond O'Connell
Gerard M Loughnane

Subjects

Physics

Topics
time and space human cognitive psychology influence decision making signals psychology everyday life

Target selection signals influence perceptual decisions by modulating the onset and rate of evidence accumulation (2016)

Abstract Computational and neurophysiological research has highlighted neural processes that accumulate sensory evidence for perceptual decisions [1]. These processes have been studied in the context of highly simplified perceptual discrimination paradigms in which the physical evidence appears at times and locations that are either entirely predictable or exogenously cued (e.g., by the onset of the stimulus itself). Yet, we are rarely afforded such certainty in everyday life. For example, when driving along a busy motorway, we must continually monitor the movements of surrounding vehicles for events that call for a lane change. In such scenarios, it is unknown which of the continuously present information sources will become relevant or when. Although it is well established that evidence integration provides an effective mechanism for countering the impact of noise [2], the question of how this mechanism is implemented in the face of uncertain evidence onsets has yet to be answered. Here, we show that when monitoring two potential sources of information for evidence occurring unpredictably in both time and space, the human brain employs discrete, early target selection signals that significantly modulate the onset and rate of neural evidence accumulation, and thereby the timing and accuracy of perceptual reports. These selection signals share many of the key characteristics of the N2pc component highlighted in the literature on visual search [3, 4] yet are present even in the absence of distractors and under situations of low temporal and spatial uncertainty. These data provide novel insights into how target selection supports decision making in uncertain environments.
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Full list of authors on original publication

Simon P Kelly, Mark A Bellgrove, Edmund Lalor, Daniel P Newman, Redmond O'Connell, Gerard M Loughnane

Experts in our system

1
Simon P Kelly
University College Dublin
Total Publications: 48
 
2
Mark A. Bellgrove
Trinity College Dublin
Total Publications: 39
 
3
Edmund C Lalor
Trinity College Dublin
Total Publications: 58
 
4
Daniel P Newman
National College Ireland
Total Publications: 9
 
5
Redmond G O'Connell
Trinity College Dublin
Total Publications: 59
 
6
Gerard M Loughnane
National College Ireland
Total Publications: 17