  We investigated the connection between the mid-infrared (MIR) and optical
spectral characteristics in a sample of 82 Type 1 active galactic nuclei
(AGNs), observed with Infrared Spectrometer on Spitzer (IRS) and Sloan Digital
Sky Survey (SDSS, DR12). We found several interesting correlations between
optical and MIR spectral properties: i) as starburst significators in MIR
increase, the EWs of optical lines H$\beta$NLR and FeII, increase as well; ii)
as MIR spectral index increases, EW([OIII]) decreases, while fractional
contribution of AGN (RAGN) is not connected with EW([OIII]); iii) The
log([OIII]5007/$\rm H\beta$NLR) ratio is weakly related to the fractional
contribution of polycyclic aromatic hydrocarbons (RPAHs). We compare the two
different MIR and optical diagnostics for starburst contribution to the overall
radiation (RPAH and BPT diagram, respectively). The significant differences
between optical and MIR starburst diagnostics were found. The starburst
influence to observed correlations between optical and MIR parameters is
discussed.
