Poster C15, Sunday, March 26, 5:00 – 7:00 pm, Pacific Concourse
The effects of time pressure on flanker task performance investigated using the drift diffusion model
Chia Ning Chiu1, Neil G Muggleton1,2,3; 1National Central University, 2University College London, 3Goldsmiths
Time pressure can be an important factor affecting decision making and can be manipulated with relative ease for cognitive tasks by, for example, limiting stimulus presentation time or limiting the time allowed to make a response. While changes in response times or accuracy rates can be indicative of the effectiveness of such manipulation, the offer less insight into the underlying reasons for the change. Alternative analysis of such data may offer insight into, for example, whether stimulus processing changes of or if there is a change in the confidence levels needed to make a decision. One analytical approach is use of the drift diffusion model (DDM), which has being increasingly employed in the assessment of cognitive performance and can provide a more specific assessment of the results obtained from task performance than that based on response times or accuracy alone (e.g. Ratcliff & Rouder, 1998). The present study examined the effects of different time limits for making a response on a flanker task (Eriksen & Eriksen, 1974). Twelve participants (mean age= 21.08 ± 2.02 years) performed this task with time limits to make a response of 0.5, 1, and 3 seconds, assumed to be associated with different levels of time pressure. Analysis showed changes for the different time limits for several measures, with a lower drift rate (or the rate of approach to a decision level) for incongruent trials being seen for the higher time pressure condition, an effect that may be consistent with pressure changing the pattern of performance.
Topic Area: ATTENTION: Other