Percentages of correct recognition of right and wrong arithmetic results as a function of operation difficulty and type of background auditory stimuli.

<p>There was no effect of the background auditory stimuli on hits during the solving of easy arithmetical operations (the “ceiling effect)”.</p

Mean response times (in ms) recorded as a function of the type of background auditory stimuli and operation difficulty.

<p>Notably, the background auditory stimuli had no effect on RTs during the solving of easy arithmetical operations (the “floor effect”).</p

Mean response times (in ms) recorded as a function of group (extroverts vs. introverts) and background auditory stimuli.

<p>The auditory stimulation had a stronger “Mozart” (alerting) effect on extroverts.</p

Mean response times (in ms) recorded as a function of background auditory stimuli, result correctness and operation difficulty.

<p>Auditory stimulation quickened responses only when the operations were difficult.</p

Mean scores obtained by the two groups of participants in the three dimensions measured by the <i>Eysenck Personality Inventory</i> (Eysenck & Eysenck, 1965): Standard deviation values are reported in italics.

<p>Mean scores obtained by the two groups of participants in the three dimensions measured by the <i>Eysenck Personality Inventory</i> (Eysenck & Eysenck, 1965): Standard deviation values are reported in italics.</p

Percentages of correct recognition of right and wrong arithmetic results as a function of operation difficulty (left).

<p>Response times relative to the correct recognition of right and wrong arithmetic results as a function of operation difficulty (right).</p