  In response priming tasks, speeded responses are performed toward target
stimuli preceded by prime stimuli. Responses are slower and error rates are
higher when prime and target are assigned to different responses, compared to
assignment to the same response, and those priming effects increase with
prime-target SOA. Here, we generalize Vorberg et al.'s (2003) accumulator model
of response priming, where response activation is first controlled exclusively
by the prime and then taken over by the actual target. Priming thus occurs by
motor conflict because a response-inconsistent prime can temporarily drive the
process towards the incorrect response. While the original model assumed prime
and target signals to be identical in strength, we allow different rates of
response activation (cf. Mattler & Palmer, 2012; Schubert et al., 2012). Our
model predicts that stronger primes mainly increase priming effects in response
times and error rates, whereas stronger targets mainly diminish response times
and priming effects.
