  This paper presents statistical analyses of random motions in a single layer
of fluidized lightweight spherical particles. Foam polystyrene spheres were
driven by an upward airflow through the sieve mesh, and their two-dimensional
motion was acquired using image analysis. In the bulk region, the particle
velocity distributions changed from Gaussian to heavy-tailed distribution as
the bulk packing fraction $\phi_b$ was increased. The mean square displacement
of the particles exhibited transition to subdiffusion at much lower $\phi_b$
than observed in previous studies using similar setup but with heavier
particles. A slight superdiffusion and significant growth of the correlation
length in the two-body velocity correlation was observed at further large
$\phi_b$. The effect of the wall on the dynamics of the particles was also
investigated and the anisotropy of the granular temperature was found to be a
useful index to discriminate between the wall region and the bulk. The
turbulence statistics in the wake of a particle indicated a strong wall-normal
asymmetry of aerodynamic forcing as the ``thermal'' agitation in the wall
region.
