The inspection time task is a simple cognitive task for which participants are required to identify the side on which the shorter of two lines is presented. The stimulus is presented for a fixed duration before being replaced by a masking stimulus. The duration of the stimulus presentation is strictly controlled and several literature reviews and meta-analysis have found moderate correlations between minimum inspection time and intelligence. The present study aimed to replicate several previous studies that have examined the relationships between intelligence, inspection time and electrophysiological measures. These previous studies have found correlations between various components of the ERP (typically in the 100 to 200 ms period) and both inspection time and intelligence. In the present study, IQ, inspection time and ERPs were recorded from twenty participants. The ERPs were obtained from three different conditions, an inspection-time like task, a visual attend condition and a visual non-attend condition. It was expected that differences would be observed in the N1-P2 rise time of the ERPs obtained from each of the different conditions. Accordingly, the correlation between the ERP measures and inspection time was expected to be dependent upon participants' ability to focus attention. Results are discussed.