“…As one might expect, spaced practice generally leads to better learning and retention than massed practice ( Shea et al, 2000 ; Dail and Christina, 2004 ; Arthur Jr. et al, 2010 ). Spacing has proven beneficial for a wide range of skills such as playing video games ( Shebilske et al, 1999 ; Stafford and Dewar, 2014 ), interviewing ( Heidt et al, 2016 ), learning surgical skills ( Verdaasdonk et al, 2007 ; Spruit et al, 2014 ; Andersen et al, 2016 ), playing a piano sequence ( Rubin-Rabson, 1940 ; Simmons, 2011 ), balancing on a swaying platform ( Shea et al, 2000 ), electrical testing of a vehicle charger ( Hagman, 1980 ), learning to enhance alpha waves through bio-feedback ( Albert et al, 1974 ) and golf putting ( Dail and Christina, 2004 ).…”