Simon, the electronic memory game created by Ralph Baer and Howard Morrison and released by Milton Bradley in 1978, is a landmark in the study of sequence memory in cognitive psychology. The game presents an ever-growing sequence of colored light and sound stimuli that the player must reproduce in exact order, providing a direct and measurable test of serial recall, the ability to remember items in their correct sequential position.

The cognitive science behind Simon Says connects deeply to George Miller's chunking theory. Miller's seminal 1956 research demonstrated that while short-term memory is limited to roughly seven items, the effective capacity can be expanded through chunking, the process of grouping individual items into larger meaningful units. Experienced Simon players unconsciously develop chunking strategies: instead of remembering "red, blue, green, yellow" as four separate items, they might encode it as two pairs or as a spatial pattern on the four-button layout. This chunking ability is what allows some players to recall sequences of 20 or more elements, far exceeding the raw capacity of short-term memory.

Simon also provides a fascinating case study in the differences between auditory and visual memory. Each button produces both a colored light (visual stimulus) and a distinct tone (auditory stimulus). Research in cognitive psychology has established that auditory sequential memory and visual sequential memory are processed through different channels, following Allan Paivio's dual-coding theory. The auditory component of Simon engages the phonological loop, a component of Baddeley's working memory model that specializes in maintaining sound-based information through subvocal rehearsal. Meanwhile, the visual component engages the visuospatial sketchpad. By providing both modalities simultaneously, Simon allows players to encode sequences through multiple channels, a phenomenon known as multimedia redundancy, which strengthens memory traces and improves recall.

The difficulty curve in Simon follows an interesting cognitive pattern. Each round adds exactly one element to the sequence, creating a linear increase in memory load. However, the subjective difficulty does not increase linearly. The first few additions are nearly effortless because they fall within working memory capacity. Around items 7 to 9, players hit a cognitive wall where raw memorization fails and strategic chunking becomes necessary. Beyond 12 to 15 items, even chunking strategies strain, and players must rely on automaticity, the process by which repeated practice converts conscious effort into unconscious habit, similar to how musicians memorize long passages.

From a neuroscience perspective, sequence memory tasks like Simon activate the dorsolateral prefrontal cortex for maintaining sequence order, the premotor cortex for motor sequence planning, and the cerebellum for timing and rhythm. This multi-region activation is why Simon has been used in clinical settings to assess cognitive function in patients with neurological conditions and to track cognitive development in children.