Figure 1.

Experimental design. Oddball and reversed blocks were composed of four‐tone repeating sequences (200 ms SOA). Frequencies, and the role of deviant and standard, were interchanged in reversed blocks (left). Global rules (middle) were composed by sequences containing three repetitions and one pure tone deviation when standard (STD), and four repetitions and one pure tone deviation when deviants (DEV). The global deviation was defined by the fourth 988 Hz pure tone. Sequences in the reversed block contained standard global rules only (rSTD). Local rules (right) were defined by the pure tones within global sequences (standards only). Three standard repetitions (STD) defined the local rule, violated by a frequency change (DEV).