PMID: 9554185Apr 29, 1998Paper

ERP components elicited in response to warning stimuli: the influence of task difficulty

Biological Psychology
G F WilsonP Ullsperger

Abstract

A series of experiments were conducted to systematically evaluate the relative contributions of task difficulty and stimulus probability to P300 amplitudes. Scalp event-related potentials (ERPs) were recorded and the topographic distributions were evaluated during a multi-level cognitive task with an antecedent warning. In three separate studies, task difficulty (five levels), probability or expectedness (10-60%), and randomness (random or blocked presentation) were manipulated. Response accuracy, subjective ratings, and reference-free averages of the P300 components elicited by the warning stimuli were evaluated. Statistical analysis indicated that significantly larger P300s were associated with the more difficult task warnings except when memory tasks were presented in a blocked design, suggesting that neither task difficulty nor probability alone can account for variations in the P300 in a multi-level task scenario. Results are discussed with regard to adaptation-level theory.

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Citations

Aug 21, 2003·Brain Research. Brain Research Protocols·Shulan Hsieh, Yen-Ting Yu
Mar 17, 2007·Child Neuropsychology : a Journal on Normal and Abnormal Development in Childhood and Adolescence·Dong XuanYuxia Yang
Nov 30, 2000·Neuroreport·A Muller-GassK B Campbell
Jan 18, 2005·Brain Research. Cognitive Brain Research·Shulan Hsieh, Lin-Chao Liu
Jun 9, 2004·Brain Research. Cognitive Brain Research·Kerstin JostFrank Rösler
Oct 23, 2013·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Daniela M PfabiganUta Sailer

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