The baseline for response latency distributions

Details The baseline for response latency distributions The baseline for response latency distributions

2009-08-24

arxiv.org/abs/0908.3432v1

Biology

Quantitative Biology

Neurons and Cognition

Submitted manuscript

Scientific paper

Response latency -- the time taken to initiate or complete an action or task -- is one of the principal measures used to investigate the mechanisms subserving human and animal cognitive processes. The right tails of response latency distributions have received little attention in experimental psychology. This is because such very long latencies have traditionally been considered irrelevant for psychological processes, instead, they are expected to reflect `contingent' neural events unrelated to the experimental question. Most current theories predict the right tail of response latency distributions to decrease exponentially. In consequence, current standard practice recommends discarding very long response latencies as `outliers'. Here, I show that the right tails of response latency distributions always follow a power-law with a slope of exactly two. This entails that the very late responses cannot be considered outliers. Rather they provide crucial information that falsifies most current theories of cognitive processing with respect to their exponential tail predictions. This exponent constitutes a fundamental constant of the cognitive system that groups behavioral measures with a variety of physical phenomena.

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